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Give complete osce answers, related examination procedures, case discussion viva questions and answers for medicine practicals

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II MBBS End of Posting OSCE - Complete Answers & Viva Guide

STATION 1: OSCE - PITTING PEDAL EDEMA (Image: Foot being pressed - pitting edema)

OSCE Answers

Q1. What is the clinical finding? (1 mark) Pitting pedal edema - visible bilateral swelling of the feet/ankles with pitting on pressure (indentation remains after finger pressure is released).

Q2. Name 3 conditions causing this: (3 marks)

Congestive heart failure (CCF) - bilateral, dependent, worse in evening
Nephrotic syndrome - bilateral, periorbital edema also present, hypoalbuminemia
Hepatic cirrhosis - bilateral, associated with ascites, jaundice, signs of chronic liver disease

Other valid causes: Hypoproteinemia (malnutrition/kwashiorkor), renal failure (CKD), deep vein thrombosis (usually unilateral), lymphedema, hypothyroidism, venous insufficiency, drugs (calcium channel blockers, steroids)

Q3. Different grades used in this clinical finding: (2 marks)

Grade	Description
Grade 1 (+1)	2 mm pitting, disappears rapidly; involves feet and ankles only
Grade 2 (+2)	4 mm pit, disappears in 10-15 seconds; extends to below the knee
Grade 3 (+3)	6 mm pit, disappears in 1-2 minutes; extends to the knee
Grade 4 (+4)	8 mm pit, persists >2 minutes; extends above the knee (thigh, sacrum)

Q4. Two pressures involved in the mechanism: (2 marks)

Hydrostatic pressure - pushes fluid OUT of capillaries into interstitium (increased in heart failure, venous obstruction)
Oncotic pressure (colloid osmotic pressure) - pulls fluid BACK into capillaries (decreased in hypoalbuminemia - nephrotic syndrome, liver disease, malnutrition)

(Starling's law of capillary exchange: Net filtration = (Pc - Pi) - (πc - πi), where edema occurs when hydrostatic pressure exceeds oncotic pressure)

Q5. What is anasarca? (2 marks) Anasarca is generalized massive edema involving the entire body including subcutaneous tissues, body cavities (ascites, pleural effusion, pericardial effusion), and internal organs. It represents the most severe form of fluid retention and is seen in:

Severe nephrotic syndrome
Advanced cardiac failure
Severe malnutrition (kwashiorkor)
Advanced hepatic failure

Examination Procedure for Pedal Edema

Introduce yourself; explain the procedure; seek verbal consent.
Position the patient supine, expose both lower limbs.
Inspection: Look for swelling, skin changes (pigmentation, varicosities, ulcers), distribution (bilateral/unilateral, symmetrical).
Palpation: Press firmly with thumb over the dorsum of foot, medial malleolus, pretibial area, and sacrum (if lying) for 5 seconds. Assess the pit depth and how long it takes to refill.
Note: extent (ankle, below knee, above knee), temperature, tenderness, skin trophic changes.
Examine for anasarca: ascites (percussion), facial edema.
Differentiate pitting from non-pitting edema (lymphedema/myxedema - non-pitting).
State clinical findings/grade.

Viva Questions & Answers - Pedal Edema

Q: What is the difference between pitting and non-pitting edema? A: Pitting edema leaves an indentation on pressure because the fluid is a protein-poor transudate that can be displaced. Non-pitting edema is due to protein-rich fluid (lymphedema) or mucopolysaccharide deposition (myxedema/hypothyroidism) that resists displacement.

Q: Why is cardiac edema worse in the evening? A: Because of dependent hydrostatic pressure accumulation during the day while standing/sitting. It typically improves overnight when legs are elevated.

Q: What is the mechanism of edema in nephrotic syndrome? A: Massive proteinuria → hypoalbuminemia → reduced oncotic pressure → fluid shifts to interstitium → edema. It is typically peri-orbital in the morning (loose connective tissue) and pedal in the evening.

Q: What is the mechanism of edema in heart failure? A: Reduced cardiac output → reduced renal perfusion → RAAS activation → Na and water retention + increased venous hydrostatic pressure → edema.

Q: How do you differentiate cardiac from renal edema? A: Cardiac edema: dependent (legs > face), associated JVP elevation, S3 gallop, cardiomegaly. Renal edema: periorbital (especially morning), massive proteinuria, hypoalbuminemia, no raised JVP initially.

Q: What is Stemmer's sign? A: Inability to pinch and lift a fold of skin on the dorsum of the second toe - positive in lymphedema.

STATION 2: OSCE - CLUBBING (Image: Bilateral clubbing of fingers)

OSCE Answers

Q1. Name the clinical finding: (1 mark) Clubbing of fingers (digital clubbing / Hippocratic fingers) - bulbous enlargement of the terminal phalanges with obliteration of the nail bed angle.

Q2. Grades of clubbing: (2 marks)

Grade	Description
Grade I	Fluctuation/softening of nail bed (earliest sign); loss of nail bed firmness
Grade II	Obliteration of the hyponychial angle (Lovibond angle >180°); Schamroth's sign positive
Grade III	Drumstick/parrot-beak deformity - bulbous enlargement of terminal phalanx
Grade IV	Hypertrophic pulmonary osteoarthropathy (HPOA) - periosteal new bone formation, painful wrists/ankles

(Some classify as: Grade 1 = nail bed fluctuation; Grade 2 = loss of angle; Grade 3 = drumstick; Grade 4 = HPOA)

Q3. Four causes of clubbing: (4 marks)

System	Causes
Respiratory	Bronchogenic carcinoma, bronchiectasis, lung abscess, empyema, fibrosing alveolitis/IPF, cystic fibrosis, mesothelioma
Cardiac	Cyanotic congenital heart disease (Fallot's tetralogy, TGA), infective endocarditis, atrial myxoma
GI	Crohn's disease, ulcerative colitis, cirrhosis, malabsorption (celiac), achalasia
Others	Familial/idiopathic, thyroid acropachy, POEMS syndrome

(Any 4 valid causes from any category = full marks)

Q4. Most accepted theory: (1 mark) The vasodilatory/platelet-derived theory (Neurogenic/Megakaryocyte theory) - also called the platelet fragment theory:

Platelet fragments and megakaryocytes that normally fragment in the pulmonary capillaries instead bypass the pulmonary circulation (via R→L shunts, arteriovenous connections, or pulmonary disease) and lodge in the digital capillaries, releasing VEGF (vascular endothelial growth factor) and PDGF (platelet-derived growth factor), causing local soft tissue and vascular proliferation of the nail bed.

Q5. One cause of unidigital and unilateral clubbing: (2 marks)

Unidigital clubbing: Sarcoidosis, median nerve injury, tophi, occupational trauma, hemiplegia affecting a single digit
Unilateral clubbing: Subclavian artery aneurysm (on affected side), brachial AV fistula, Pancoast tumor (ipsilateral), arteriovenous fistula (dialysis fistula)

(Full marks: Unidigital = occupational/trauma or sarcoidosis; Unilateral = subclavian aneurysm or AV fistula)

Examination Procedure for Clubbing

Introduce yourself, explain, get consent.
Expose both hands fully; compare both sides.
Inspection: Look for bulbous terminal phalanx, curvature of nail in both planes (anteroposterior and transverse), loss of periungual angle.
Schamroth's sign: Ask patient to place dorsa of opposing index fingers together - loss of the normal diamond-shaped window indicates clubbing.
Palpation: Fluctuation of nail bed (earliest sign) - press on nail bed; it should be firm normally; in clubbing it feels boggy/fluctuant.
Lovibond angle: Angle between nail and nail bed normally <160°; in clubbing >180°.
Check for HPOA: tenderness over wrist/ankle periosteum.
Look for associated signs: cyanosis (cardiac/respiratory), tar staining (smoking - lung Ca), other respiratory signs.
State grade of clubbing and give clinical impression.

Viva Questions & Answers - Clubbing

Q: What is Schamroth's sign? A: When opposing index fingers are placed dorsum-to-dorsum, a diamond-shaped window is normally visible at the nail bases. In clubbing, this window is obliterated. It is the most useful bedside screening test for clubbing.

Q: What is the earliest sign of clubbing? A: Fluctuation/sponginess of the nail bed (Grade I). The periungual skin feels boggy when pressed.

Q: What is HPOA? A: Hypertrophic Pulmonary Osteoarthropathy - periosteal new bone formation (visible on X-ray as periosteal reaction) along the distal radius, ulna, tibia and fibula, causing painful swollen joints. Associated with bronchogenic carcinoma (most common cause), pleural mesothelioma, and occasionally GI causes.

Q: How do you differentiate true clubbing from pseudo-clubbing? A: In pseudo-clubbing (e.g., hyperparathyroidism, bone resorption), the terminal phalanx appears short/bulbous but the nail bed angle is preserved and there is no fluctuation. True clubbing has sponginess of nail bed + loss of Lovibond angle.

Q: What is the significance of unilateral clubbing vs bilateral? A: Bilateral clubbing = systemic cause (cardiac, respiratory, GI, familial). Unilateral = local vascular cause (subclavian artery aneurysm, AV fistula on that side, Pancoast tumor causing ipsilateral vascular compromise).

Q: Name the most common cause of clubbing in India. A: Bronchiectasis (due to old tuberculosis) and bronchogenic carcinoma are the two most common causes.

STATION 3: PERIPHERAL PULSE EXAMINATION

Step-by-Step Procedure (Full Marks Guide)

Step 1 - Introduction & Consent (1 mark): "Good morning, I am [Name], a medical student. I would like to examine your pulse. This is a painless examination. May I proceed?"

Step 2 - Verbal consent (½ mark): Wait for patient's agreement before proceeding.

Step 3 - Rate and Rhythm at Radial Artery (1 mark):

Position: Patient seated/supine, arm relaxed.
Palpate the radial artery at the wrist (lateral to flexor carpi radialis tendon) using the pads of 2nd, 3rd, and 4th fingers.
Count rate for 60 seconds (or 15 seconds × 4).
Note rhythm: Regular / Irregularly irregular (AF) / Regularly irregular (2° heart block, bigeminy).
Normal: 60-100 bpm, regular.

Step 4 - Volume and Character at Carotid Artery (1 mark):

Palpate the carotid artery medial to sternocleidomastoid at the level of the thyroid cartilage.
Use index and middle finger; NEVER compress both carotids simultaneously.
Assess volume (amplitude): normal / small (aortic stenosis, CCF, shock) / large (AR, hyperdynamic).
Assess character:
- Normal: smooth single peak
- Collapsing/water-hammer: AR, PDA, Thyrotoxicosis
- Slow-rising/plateau: Aortic stenosis
- Bisferiens: Combined AS+AR, HOCM
- Pulsus paradoxus: Cardiac tamponade, severe asthma
- Pulsus alternans: Severe LV failure

Step 5 - Vessel Wall Condition by 3-Finger Method (1 mark):

Use the 3-finger method at the radial artery:
- Proximal finger: compresses the artery (obliterates pulse)
- Middle finger: assesses the vessel wall itself
- Distal finger: controls distal flow
Feel for thickening, tortuosity, or beading of the vessel wall.
Normal: soft, pliable, non-palpable when empty. Atherosclerosis: thick, hard, tortuous (pipe-stem artery).

Step 6 - Radio-Radial Delay (1 mark):

Palpate both radial arteries simultaneously using both hands.
Normally simultaneous. A delay on one side suggests:
- Aortic coarctation (usually left radial delayed)
- Aortic aneurysm / dissection
- Subclavian artery stenosis/thrombosis
- Cervical rib / Thoracic outlet syndrome

Step 7 - Radio-Femoral Delay (1 mark):

Palpate radial (one hand) and femoral (other hand) simultaneously.
The femoral pulse should be felt simultaneously or slightly after the radial.
A delayed/weak femoral pulse suggests: Coarctation of the aorta (most classic cause).

Step 8 - Other Peripheral Pulses (2 marks - any 4):

Pulse	Location	Technique
Brachial	Medial to biceps tendon, antecubital fossa	2-3 finger pads
Femoral	Midinguinal point (midway between ASIS and pubic symphysis)	Deep palpation, 3 fingers
Popliteal	Popliteal fossa, knee flexed 30°	Both thumbs anteriorly, fingers posteriorly
Dorsalis pedis	Dorsum of foot, lateral to extensor hallucis longus	2-3 finger pads
Posterior tibial	Behind medial malleolus	2-3 finger pads

Step 9 - Clinical Findings/Impression (1 mark): State: "Pulse rate is ___ bpm, regular/irregular, normal/increased/decreased volume, normal/abnormal character. Vessel wall is normal/thickened. No radio-radial/radio-femoral delay. All peripheral pulses are palpable/reduced/absent."

Step 10 - Thank the patient (½ mark).

Viva Questions & Answers - Peripheral Pulses

Q: What is the significance of radio-femoral delay? A: It indicates coarctation of the aorta - narrowing of the aorta distal to the origin of the left subclavian artery. The femoral pulse is felt later and with reduced volume compared to the radial pulse.

Q: What is a collapsing pulse (water-hammer pulse)? How do you elicit it? A: A collapsing pulse has rapid upstroke and sudden collapse. Elicited by raising the patient's arm above the level of the heart while feeling the radial pulse - the slapping sensation increases. Causes: Aortic regurgitation, PDA, arteriovenous fistula, thyrotoxicosis, severe anemia, pregnancy.

Q: What is pulsus paradoxus? A: Exaggeration of the normal inspiratory fall in systolic BP >10 mmHg during inspiration. Causes: Cardiac tamponade (most important), severe bronchial asthma, constrictive pericarditis.

Q: Why is the carotid artery used for volume and character assessment? A: The carotid artery is closest to the aortic valve and best reflects the central aortic pulse waveform. The radial pulse is modified by peripheral vascular resistance and pulse wave reflection, making it less reliable for character assessment.

Q: What is pulsus alternans? A: Alternating strong and weak pulses with a regular rhythm. Indicates severe left ventricular dysfunction (LV failure). Different from bigeminy (which has irregular rhythm).

Q: How do you assess pulsus paradoxus clinically? A: With a sphygmomanometer: inflate cuff above systolic, deflate slowly; note the pressure at which first Korotkoff sounds are heard (only during expiration), then the pressure when they are heard throughout the cycle. A difference >10 mmHg = pulsus paradoxus.

STATION 4: HISTORY OF CHEST PAIN

Full Structured History (10-Mark Guide)

Step 1 - Self introduction, explanation, permission (½ mark): "Good morning/afternoon. I am [Name], a 2nd year MBBS student. I need to ask you some questions about your chest pain to help understand your condition. May I proceed? Please feel free to stop me if you are uncomfortable."

Step 2 - Site of chest pain (1 mark): "Where exactly is the pain? Can you point to it with one finger?"

Central/retrosternal: Ischemic heart disease, GERD
Left-sided: Cardiac, pleuritic
Right-sided: Pleuritic, musculoskeletal
Epigastric: GERD, peptic ulcer, inferior MI
Localized, well-defined: Musculoskeletal

Step 3 - Onset (1 mark): "Did the pain start suddenly or gradually? What were you doing when it started?"

Sudden/instantaneous: Aortic dissection, pneumothorax, PE
Gradual: Angina, pericarditis, esophageal
On exertion: Stable angina, GERD

Step 4 - Character (1 mark): "How would you describe the pain? Pressing, squeezing, burning, tearing, stabbing, sharp?"

Squeezing/crushing/pressure: Ischemia (MI/angina)
Tearing/ripping: Aortic dissection
Burning: GERD, peptic ulcer
Sharp, stabbing: Pleurisy, pericarditis, MSK

Step 5 - Radiation (1 mark): "Does the pain spread anywhere else?"

Left arm, left shoulder, jaw, neck, epigastrium: Classic MI/angina
Back/between shoulder blades: Aortic dissection, PE
Right shoulder: Diaphragmatic irritation (hepatic, subphrenic)
Shoulder tip: Pericarditis

Step 6 - Duration (1 mark): "How long does the pain last?"

<5 minutes: Stable angina (relieved by rest/GTN)
20-30 minutes to hours: Unstable angina/NSTEMI/STEMI
Days: Pericarditis, musculoskeletal
Seconds: Musculoskeletal

Step 7 - Exacerbating factors (1 mark): "What makes it worse?"

Exertion: Angina, cardiac failure
Respiration/coughing: Pleurisy, pericarditis, pneumothorax, rib fracture
Movement/position: Musculoskeletal, pericarditis (sitting forward relieves pericarditis)
Food/lying down: GERD

Step 8 - Relieving factors (1 mark): "What makes it better?"

Rest: Stable angina
Sublingual GTN (nitrates): Angina (relieved within 1-3 min), GERD (also responds but slower)
NSAIDs: Pericarditis, pleurisy, musculoskeletal
Antacids: GERD
Leaning forward: Pericarditis

Step 9 - Associated factors (1 mark): "Do you have any of the following along with the pain?"

Breathlessness, sweating, nausea/vomiting, palpitation, dizziness/syncope: MI / ACS
Fever, pleuritic rub: Pericarditis/pleuritis
Cough with blood (hemoptysis): PE, lung cancer
History of trauma: Musculoskeletal, rib fracture

Step 10 - Clinical impression (1 mark): "Based on the history, this patient likely has [Acute Coronary Syndrome / Stable Angina / Aortic dissection / Pleuritis / GERD / Musculoskeletal pain]."

Step 11 - Thank the patient (½ mark): "Thank you very much for your cooperation. We will now proceed with the examination."

Viva Questions - History of Chest Pain

Q: How do you differentiate cardiac from pleuritic chest pain? A: Cardiac pain is central, squeezing, radiates to arm/jaw, associated with sweating and dyspnea, worsened by exertion, not affected by breathing. Pleuritic pain is sharp, localized, worsened by inspiration and coughing, relieved by holding breath, associated with fever/cough.

Q: What are the red flag features in chest pain? A: Central crushing chest pain radiating to jaw/arm + sweating + breathlessness (MI); tearing pain radiating to back + BP difference between arms (aortic dissection); sudden dyspnea + pleuritic pain + hemoptysis (PE).

Q: GTN relieves chest pain in which conditions and by what mechanism? A: GTN (glyceryl trinitrate) is a nitric oxide donor → smooth muscle relaxation → venodilation (reduces preload) + mild arterial dilation → reduces cardiac workload → relieves ischemic angina. Note: GERD can also respond to GTN (esophageal spasm), so GTN response does NOT exclusively confirm cardiac origin.

STATION 5: HISTORY OF DYSPNEA (BREATHLESSNESS)

Full Structured History (10-Mark Guide)

Step 1 - Self introduction (½ mark): As above.

Step 2 - Onset (1 mark): "When did the breathlessness start? Was it sudden or gradual?"

Sudden onset: Acute LVF (pulmonary edema), pneumothorax, PE, acute asthma
Gradual/progressive: COPD, CCF, ILD, anemia, pleural effusion

Step 3 - Duration (1 mark): "How long have you been having this? Is it present all the time or only sometimes?"

Step 4 - Progression (1 mark): "Has it been getting worse over time? At what pace?"

Slowly progressive: COPD, ILD, CCF
Rapidly progressive: Acute LVF, pneumothorax

Step 5 - Grading (NYHA / MRC scale) (1 mark): "Can you walk on level ground? Do you get breathless on climbing stairs? At rest?"

NYHA Grading (Cardiac):

Grade	Description
I	No symptoms on ordinary activity
II	Symptoms on moderate exertion (stairs, walking fast)
III	Symptoms on minimal exertion (slow walking on level)
IV	Symptoms at rest

MRC Dyspnea Scale (Respiratory):

Grade	Description
1	Only strenuous exercise
2	Walking up incline or stairs quickly
3	Slower than peers on level ground
4	Stop after 100 meters
5	Too breathless to leave the house

Step 6 - Orthopnea and PND (1 mark):

Orthopnea: "How many pillows do you use at night?" (Breathlessness on lying flat - indicates pulmonary venous congestion in LVF; also COPD, severe asthma)
PND (Paroxysmal Nocturnal Dyspnea): "Do you wake up suddenly at night with severe breathlessness?" (Classic LVF - patient sits up, opens window, relieved after 15-30 min)

Step 7 - Exacerbating factors (1 mark):

Exertion: Cardiac failure, COPD
Non-compliance with medications: CCF, asthma, COPD
Allergens, cold air, exercise: Asthma
Lying down: LVF (orthopnea)

Step 8 - Relieving factors (1 mark):

Rest: Cardiac failure
Bronchodilators/inhalers: Asthma, COPD
Sitting upright: LVF
Diuretics (tablets): CCF

Step 9 - Associated factors (1 mark):

Chest pain + palpitation: Cardiac cause
Wheeze: Asthma, COPD, cardiac asthma
Pedal edema + orthopnea + PND: Congestive heart failure
Cough with expectoration: COPD, bronchiectasis
Hemoptysis: TB, malignancy, mitral stenosis, PE
Fever: Pneumonia, TB

Step 10 - Clinical impression (1 mark): "This patient likely has NYHA Grade ___ dyspnea due to [Congestive Heart Failure / Bronchial Asthma / COPD / ILD]."

Step 11 - Thank patient (½ mark).

Viva Questions - History of Dyspnea

Q: What is the difference between orthopnea and PND? A: Orthopnea is breathlessness occurring within minutes of lying down, immediately relieved by sitting up - due to redistribution of blood from dependent regions to central circulation when supine, increasing pulmonary venous pressure in an already compromised LV. PND is sudden breathlessness awakening the patient 1-2 hours after sleeping, requiring sitting up for 15-30 minutes for relief - due to gradual reabsorption of peripheral edema fluid during sleep + nocturnal bronchoconstriction (vagal tone), causing acute pulmonary edema.

Q: What is cardiac asthma? A: Wheezing due to peribronchial edema in left heart failure. Needs to be distinguished from bronchial asthma: cardiac asthma occurs in older patients, associated with orthopnea/PND, crackles at bases, responds to diuretics; bronchial asthma has a history of atopy, eosinophilia, responds to bronchodilators.

Q: What is Platypnea? What is Trepopnea? A: Platypnea = breathlessness worse in upright position, relieved lying down (opposite of orthopnea) - seen in hepatopulmonary syndrome, intracardiac shunts. Trepopnea = breathlessness in one lateral decubitus position only - seen in unilateral lung disease or pleural effusion.

Q: How do you grade breathlessness using NYHA and when do you use MRC? A: NYHA classification is used for cardiac causes of dyspnea. MRC (Medical Research Council) scale is used for respiratory causes, especially COPD. Both are functional scales based on the level of activity that triggers symptoms.

Quick Summary Table for Exam Revision

Station	Clinical Finding	Key Mechanism	Key Grades/Scale
Pitting Edema	Fluid in interstitium	Hydrostatic ↑ / Oncotic ↓	Grade 1-4 (2-8 mm pit)
Clubbing	Soft tissue/vascular proliferation	Platelet/VEGF theory	Grade I-IV
Peripheral Pulse	Vascular exam	Starling forces	Rate, rhythm, volume, character
Chest Pain History	Ischemia / other	Demand-supply imbalance	Stable/Unstable/STEMI
Dyspnea History	LVF / respiratory	Pulmonary congestion	NYHA I-IV / MRC 1-5

All answers are based on standard clinical medicine references including Harrison's Principles of Internal Medicine 22E and Davidson's Principles and Practice of Medicine. Good luck with your End of Posting OSCE!

Xray all details forMedicine practical examination

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I have the full content from the PDF. Now I'll provide the comprehensive, detailed answer covering every X-ray in the series with all examination details, findings, differential diagnoses, and viva questions.

X-RAY SERIES - Complete Medicine Practical Examination Guide

Dr. A.T. Jayaraj, M4 Unit - II MBBS

HOW TO PRESENT ANY X-RAY IN OSCE/PRACTICAL (Universal Template)

Before describing findings, always state:

Type of X-ray: Chest / Abdomen / Spine / Skull
View: PA (posteroanterior) / AP / Lateral / Oblique
Patient details: Name, age, sex (if available on film)
Technical adequacy:
- Rotation: Medial ends of clavicles equidistant from spinous processes
- Inspiration: 5-6 anterior ribs / 8-10 posterior ribs visible above diaphragm
- Exposure: Vertebral bodies faintly visible behind heart; lung markings clearly seen
Describe systematically: ABCDE - Airway, Bones, Cardiac, Diaphragm, Everything else (lungs/soft tissue)

PART 1: NORMAL CHEST X-RAY

What to identify as "Normal"

Structure	Normal Finding
Trachea	Midline, slight rightward deviation at carina is normal
Carina angle	<70° (widening suggests LA enlargement)
Lung fields	Clear, bilateral bronchovascular markings visible, more prominent at bases
Hilum	Left hilum slightly higher than right; right hilum at anterior end of 6th rib
Cardiothoracic (CT) ratio	<0.5 in PA view (heart width / chest width)
Heart borders	Right: right atrium + SVC; Left: aortic knuckle + pulmonary trunk + left atrial appendage + LV
Diaphragm	Right dome higher than left (by 1.5-2.5 cm); clear costophrenic and cardiophrenic angles
Costophrenic angles	Acute, clear (blunting = 200 mL fluid)
Bones	Ribs, clavicles, scapula - no lytic/blastic lesions
Soft tissue	Normal breast shadows (females), no subcutaneous emphysema

Viva: What forms the cardiac borders on CXR?

Right border (top to bottom): SVC + Right atrium
Left border (top to bottom): Aortic knuckle (aortic arch) + Pulmonary trunk + Left atrial appendage + Left ventricle

PART 2: PLEURAL EFFUSION

Key X-Ray Findings

Feature	Description
Blunting of costophrenic angle	Earliest sign (200 mL on PA view; 75 mL on lateral view)
Blunting of cardiophrenic angle	Larger collections
Homogeneous opacity	Starts at base, opacifies upward
Meniscus sign	Concave upper border (higher laterally than medially) due to surface tension
Mediastinal shift	Away from effusion in massive effusion (>1000 mL) - distinguish from collapse where shift is toward
Obliteration of diaphragm	As fluid increases
White out lung	Entire hemithorax opacified in massive effusion
Subpulmonary effusion	Fluid trapped between lung base and diaphragm; apparent elevated hemidiaphragm; confirmed by decubitus film

Volume thresholds:

75 mL: Visible on lateral X-ray (posterior costophrenic angle)
200 mL: Visible on PA/AP view (lateral costophrenic angle blunting)
500 mL: Opacifies up to hilum
>1000 mL: Mediastinal shift to opposite side

Causes of Pleural Effusion (OSCE/Viva)

Exudate (protein >3 g/dL, LDH >200)	Transudate (protein <3 g/dL)
Pneumonia (parapneumonic)	Left heart failure (most common)
Tuberculosis (most common cause in India)	Nephrotic syndrome
Malignancy (mesothelioma, metastases)	Hepatic cirrhosis
Pulmonary embolism	Hypoalbuminemia

Light's Criteria for Exudate (any one):

Pleural fluid protein / serum protein > 0.5
Pleural fluid LDH / serum LDH > 0.6
Pleural fluid LDH > 2/3 upper limit of normal serum LDH

Viva Questions - Pleural Effusion

Q: How do you differentiate massive pleural effusion from collapse of an entire lung on CXR? A: Both cause complete white-out. Key difference: massive effusion - mediastinal shift AWAY from opacity; collapse - mediastinal shift TOWARD the opacity (due to volume loss pulling mediastinum).

Q: What is a subpulmonary effusion? How do you confirm it? A: Fluid collects between lung base and diaphragm, mimicking an elevated diaphragm. Confirmed by: lateral decubitus X-ray (fluid layers out), or ultrasound.

Q: What is the significance of the meniscus sign? A: It is the concave upper border of pleural fluid on PA CXR, highest laterally, due to capillary forces along pleural surfaces. It is absent in loculated effusions or when pneumothorax is also present (straight horizontal line = hydropneumothorax).

PART 3: PNEUMOTHORAX

Key X-Ray Findings

Feature	Description
Absent bronchovascular markings	Lung markings absent peripheral to the visceral pleural line
Visible visceral pleural line	Thin white line separating lung from air-filled pleural space
Deep sulcus sign	Radiolucent lateral costophrenic angle - seen in supine patients (X-ray taken in ICU/emergency), the air rises anteriorly and deepens the sulcus
Mediastinal shift	Away from pneumothorax - in TENSION pneumothorax (medical emergency!)
Lung collapse	Toward hilum

Types of Pneumothorax

Type	CXR Finding	Clinical
Spontaneous (primary)	Visceral pleural line, no shift	Young tall males, Marfan syndrome
Tension	Mediastinal + tracheal shift away, diaphragm pushed down	Emergency - needle decompression immediately
Hydropneumothorax	Air-fluid level with straight horizontal line	TB, trauma, bronchopleural fistula

Causes:

Primary spontaneous: Rupture of apical blebs; tall thin young males
Secondary: COPD, TB, bronchogenic carcinoma, Pneumocystis jirovecii pneumonia, Marfan syndrome, cystic fibrosis
Traumatic: Rib fractures, iatrogenic (central line insertion, thoracentesis, mechanical ventilation)

Viva Questions - Pneumothorax

Q: What is the deep sulcus sign? A: In a supine patient, air in the pleural space rises anteriorly (not to the apex as in erect view). It collects in the anterior costophrenic recess, deepening and hyperlucifying the lateral costophrenic angle - called the deep sulcus sign. It is the classic sign of pneumothorax on a supine/AP film.

Q: How do you manage tension pneumothorax? A: Do NOT wait for CXR if clinically suspected. Immediate needle decompression - 14G/16G needle in the 2nd intercostal space, midclavicular line. Then insert intercostal drain (ICD) in the 5th ICS, midaxillary line (safe triangle).

Q: How much lung collapse is considered large pneumothorax? A: >2 cm rim of air on CXR between lung edge and chest wall (BTS guidelines) = large pneumothorax requiring drainage.

PART 4: HYDROPNEUMOTHORAX

Key X-Ray Finding

Air-fluid level with a STRAIGHT horizontal upper border (meniscus sign of effusion is absent because the air above creates a straight interface)
Air above, fluid below, separated by a straight horizontal line
Absent lung markings peripherally

Causes:

Bronchopleural fistula (post-pneumonectomy, trauma)
Rupture of lung abscess into pleura
Tuberculosis
Empyema + pneumothorax
Esophageal perforation (Boerhaave syndrome)

PART 5: LUNG ABSCESS

Key X-Ray Findings

Feature	Description
Cavity	Thick-walled round opacity with irregular inner wall
Air-fluid level	Pus below, air above - pathognomonic finding
Location	Right lower lobe posterior segment most common (aspiration in supine position)
Surrounding infiltrate	Areas of consolidation around the cavity

Most Common Organisms:

Anaerobes (most common - Peptostreptococcus, Bacteroides, Fusobacterium)
Staphylococcus aureus (especially post-influenza; produces multiple abscesses, pneumatoceles in children)
Klebsiella pneumoniae (upper lobe, alcoholics, diabetics; causes "bulging fissure sign")
Pseudomonas aeruginosa
Mycobacterium tuberculosis (upper lobe cavities)

Most Common Cause: Aspiration (especially in:)

Alcoholics / unconscious patients
Dental procedures
Patients with dysphagia (neurological disease)
Epileptics

Viva Questions - Lung Abscess

Q: How do you differentiate lung abscess from empyema with bronchopleural fistula on CXR? A: Lung abscess: round/spherical shape, equal width in both views, thick irregular wall, surrounded by lung tissue, air-fluid level length is equal in PA and lateral views. Empyema with BPF: lenticular/elliptical, split pleura sign on CT, wider in lateral view, tapering at edges, smooth inner wall.

Q: What is Klebsiella pneumonia's classical appearance? A: Bulging fissure sign - the interlobar fissure bulges downward (or outward) due to the heavy mucoid exudate. Typically upper lobe consolidation in alcoholics and diabetics.

PART 6: CONSOLIDATION (PNEUMONIA)

Key X-Ray Findings

Feature	Description
Patchy / homogeneous opacity	Lobar (lobar pneumonia) or patchy/segmental (bronchopneumonia)
Air bronchogram	Lucent bronchial shadows (air-filled bronchi) visible within opaque (fluid-filled) lung - confirms alveolar filling
Silhouette sign	Loss of normal border between two structures of similar density when they become adjacent due to consolidation

Silhouette Sign - Key Examples:

Consolidation Location	Border Lost
Right middle lobe	Right heart border (right atrium)
Right lower lobe	Right hemidiaphragm
Right upper lobe	Right superior mediastinum
Left lower lobe	Left hemidiaphragm (but NOT left heart border)
Lingula (left)	Left heart border

Causes of Consolidation:

Infective: Bacterial pneumonia (Strep. pneumoniae most common), TB, fungal
Non-infective: Pulmonary edema, pulmonary hemorrhage, pulmonary infarction, cryptogenic organizing pneumonia (COP), alveolar cell carcinoma

Viva Questions - Consolidation

Q: What is an air bronchogram and what is its significance? A: Air bronchogram = air-filled bronchi visible as dark branching lucencies within an opaque (airless/fluid-filled) lung. It means the alveoli are filled with fluid/cells but the bronchi remain patent (air-filled). This differentiates consolidation/pulmonary edema from collapse (where bronchi are also blocked/collapsed).

Q: What is the silhouette sign? A: When two structures of equal radiodensity are adjacent, their border is lost. In pneumonia, when an air-filled lobe becomes consolidated (equal density to adjacent heart/diaphragm), the interface disappears. This helps localize which lobe/segment is involved.

PART 7: COLLAPSE (ATELECTASIS)

Key X-Ray Findings

Feature	Description
Volume loss	Ipsilateral mediastinal shift TOWARD collapse, elevated hemidiaphragm, crowded ribs
Increased opacity	Collapsed lung appears white
Golden S sign	Right upper lobe collapse - S-shaped curve of the minor fissure (convex bulge of central mass = hilar lymph node/carcinoma + concave collapsed upper lobe)
Sail sign	Left lower lobe collapse - triangular opacity projecting from left heart border (like a sailing ship's sail, also called "flat waist" sign)
Juxtaphrenic peak sign	Small triangular upward pointing opacity at the medial aspect of elevated hemidiaphragm

Causes:

Obstructive (most common): Bronchogenic carcinoma (especially with Golden S sign), mucus plug, foreign body, enlarged lymph nodes
Non-obstructive: Post-operative atelectasis (mucus plugging), pleural effusion compressing lung, pneumothorax

Viva: Golden S sign

The Golden S sign is seen in right upper lobe collapse when the cause is a central hilar mass (usually bronchogenic carcinoma). The minor fissure shows an S-shaped curve: the upper convex bulge is due to the hilar mass pushing the fissure outward, and the lower concave curve is due to the collapsed atelectatic upper lobe pulling inward.

PART 8: MILIARY TUBERCULOSIS

Key X-Ray Findings

Multiple bilateral small opacities (1-3 mm in diameter)
Uniform in size and density
Scattered throughout both lung fields resembling millet seeds (milium = millet in Latin)
No lobar predominance (unlike sarcoidosis which is upper lobe)

Differential Diagnoses (DD):

ARDS (Acute Respiratory Distress Syndrome) - similar diffuse bilateral opacities but more confluent, rapid onset
Sarcoidosis - upper and mid lobe nodules, bilateral hilar lymphadenopathy
Metastatic disease (Cannon ball) - larger nodules, irregular
Hemosiderosis - iron deposits
Pneumoconiosis (silicosis, coal workers' pneumoconiosis) - upper lobe predominant

Must Know for Viva - Tuberculosis:

Etiology: Mycobacterium tuberculosis - aerobic, acid-fast bacillus (AFB), slow-growing (doubling time 15-20 hours)

Microbiology:

ZN (Ziehl-Neelsen) stain: Red bacilli on blue background (carbol fuchsin)
Culture: Lowenstein-Jensen (LJ) medium - 6-8 weeks; BACTEC - 2 weeks
Cord factor (trehalose dimycolate): virulence; serpentine cords on culture

Pathogenesis:

Primary TB: Ghon focus (lower lobe subpleural) + hilar lymph node = Ghon complex → usually heals with calcification
Post-primary (Reactivation): Apical/posterior segments of upper lobes (high O2 tension); cavitation common

Clinical Presentation: Low grade fever, night sweats, weight loss, cough >2 weeks, hemoptysis, breathlessness

Lab Diagnosis:

Sputum AFB smear (3 specimens: 2 spot + 1 early morning)
GeneXpert MTB/RIF (rapid molecular test - also detects rifampicin resistance)
Culture and sensitivity (gold standard)
Mantoux test (TST): >10 mm positive in India
IGRA (Interferon Gamma Release Assay): QuantiFERON-TB Gold

Treatment (RNTCP/NTEP India - 2 HRZE + 4 HR):

Phase	Drugs
Intensive (2 months)	Rifampicin (R) + Isoniazid (H) + Pyrazinamide (Z) + Ethambutol (E)
Continuation (4 months)	Rifampicin (R) + Isoniazid (H)

PART 9: LUNG MASS / BRONCHOGENIC CARCINOMA

Key X-Ray Findings Suggesting Malignancy

Feature	Description
Irregular borders	Lobulated, irregular, non-smooth margin
Spiculation	Radiating streaks/"sunburst" from mass - highly suspicious for malignancy
Cavity	Thick-walled, irregular inner wall (vs. thin-walled in benign)
Calcification	Eccentric calcification = malignant; central/laminated/popcorn = benign
Tracheal pull	Mass pulling trachea toward it (indicates volume loss + fibrosis)
Lymphadenopathy	Hilar + mediastinal widening = lymph node involvement
Pleural effusion	Malignant effusion
Rib destruction	Direct invasion

Types of Lung Cancer and Locations:

Type	Location	Features
Squamous cell	Central (hilar)	Cavitates, Pancoast tumor, PTH-rp (hypercalcemia)
Adenocarcinoma	Peripheral	Most common type overall, subpleural nodule
Small cell (SCLC)	Central	Most aggressive, paraneoplastic, no surgery
Large cell	Peripheral	Large peripheral mass

Pancoast Tumor (Superior Sulcus Tumor):

Apex of lung → invades brachial plexus (C8, T1), sympathetic chain, subclavian vessels, ribs
Pancoast syndrome: shoulder/arm pain + Horner syndrome (ptosis, miosis, anhidrosis, enophthalmos) + hand wasting

PART 10: CANNON BALL APPEARANCE (PULMONARY METASTASES)

Key X-Ray Findings

Multiple bilateral round opacities of varying sizes
Well-defined, smooth margins ("cannonball" appearance)
Predominantly lower zone distribution
No calcification (usually)
No air bronchogram

Common Primary Tumors (mnemonic: B-PRCK or "Big Renal Cells Kill and Breed"):

Breast carcinoma (most common)
Prostate carcinoma
Renal cell carcinoma
Colon carcinoma
Thyroid carcinoma
Others: Choriocarcinoma, sarcomas, testicular tumors

Viva: How do you differentiate cannon ball metastases from miliary TB?

Cannon ball: large (>1 cm), bilateral, well-defined round nodules, lower zone, known primary
Miliary TB: tiny (1-3 mm), uniform size, bilateral, all zones, constitutional symptoms (fever, weight loss, night sweats)

PART 11: CARDIOMEGALY

Key X-Ray Finding

Cardiothoracic (CT) ratio > 0.5 on PA view
- CT ratio = Maximum cardiac transverse diameter / Maximum thoracic transverse diameter
- Normal: <0.5 in adults (PA view); up to 0.55 acceptable on AP view

Causes of Cardiomegaly:

Left ventricular enlargement: Hypertension, AS, AR, cardiomyopathy, ischemic heart disease
Right ventricular enlargement: Pulmonary hypertension, pulmonary stenosis, ASD
Biventricular: CCF, dilated cardiomyopathy
Pericardial effusion: "Money in bag" / "water bottle" appearance (globular heart)

Viva: How do you differentiate cardiomegaly from pericardial effusion on CXR?

Both give globular enlarged cardiac shadow.
Pericardial effusion: globular "money in bag" / "water bottle" shape, no specific chamber enlargement, normal pulmonary vasculature (unless tamponade), rapid change in size on serial films.
Cardiomegaly: specific chamber enlargement may be visible, pulmonary vascular congestion often present.
Echocardiography is definitive.

PART 12: PERICARDIAL EFFUSION

Key X-Ray Finding

"Money in bag" / "Water bottle" appearance: Globular, flask-shaped enlargement of cardiac shadow
Rapid increase in cardiac silhouette size on serial films
Normal pulmonary vasculature (unless causing tamponade with raised venous pressure)
"Oreo cookie sign" on lateral film: pericardial fat pad - epicardial fat - pericardial fluid (seen as double density)

Causes:

Category	Examples
Infection	TB (most common in India), Post-viral (Coxsackie B, Echovirus), Bacterial
Malignancy	Lung Ca, Breast Ca, Lymphoma, Mesothelioma
Immune-mediated	Dressler's syndrome (post-MI/post-cardiac surgery), Rheumatic fever, SLE, RA
Metabolic	Uremia, Hypothyroidism
Trauma	Hemopericardium
Idiopathic	Most common cause overall in developed countries

Beck's Triad (Cardiac Tamponade):

Hypotension
Muffled heart sounds
Raised JVP (Kussmaul's sign - JVP rises on inspiration)

PART 13: TETRALOGY OF FALLOT (TOF)

Key X-Ray Finding

Boot-shaped heart (Coeur en Sabot): Due to:
- Right ventricular hypertrophy → upturned cardiac apex (boot toe)
- Pulmonary trunk hypoplasia → concave pulmonary bay (indentation of left heart border at pulmonary artery region - the "waist" of the boot)
Oligemic lung fields: Reduced pulmonary vascular markings (due to decreased pulmonary blood flow)
Normal/small heart size
Right aortic arch in 25% cases (aorta arch on right side)

The Tetrad (4 components):

Ventricular septal defect (large, perimembranous)
Overiding aorta (straddles VSD, receives blood from both ventricles)
Pulmonary stenosis / RV outflow tract obstruction (infundibular most common)
Right ventricular hypertrophy (consequence of obstruction)

Mnemonic: VPOR or "Practically Only Very Rare" - Pulm stenosis, Overriding aorta, VSD, RVH

Viva: Tet spells (Hypercyanotic spells)

Episodes of acute severe cyanosis + hyperpnea in TOF infants (usually 2 months - 2 years)
Triggered by: crying, feeding, exertion → decreased SVR → increased R→L shunt
Management: Knee-chest position (increases SVR), oxygen, morphine, propranolol, IV fluids
Treatment: surgical repair (total correction) or palliative Blalock-Taussig shunt

PART 14: TAPVR (Total Anomalous Pulmonary Venous Return)

Key X-Ray Finding

Figure-of-8 sign / Snowman sign
Seen in Type I TAPVR (supracardiac type - veins drain into left innominate vein/SVC)
Upper "head" of snowman: dilated left vertical vein + left innominate vein + dilated SVC
Lower "body" of snowman: enlarged heart
Plethoric lung fields (increased pulmonary vascular markings)

Types of TAPVR:

Type	Drainage	Obstruction	CXR
Type I - Supracardiac (50%)	Left vertical vein → SVC	No	Snowman sign
Type II - Cardiac (30%)	Coronary sinus or right atrium	No	Cardiomegaly
Type III - Infracardiac (15%)	Portal vein / IVC (below diaphragm)	YES	Small heart + severe pulmonary edema
Type IV - Mixed (5%)	Mixed	Variable	Variable

PART 15: TRANSPOSITION OF GREAT ARTERIES (TGA)

Key X-Ray Finding

Egg on a string (Egg on side) appearance
Narrow mediastinum: Because aorta (anterior) and pulmonary artery (posterior) lie directly anterior-posterior instead of side-by-side → narrow vascular pedicle ("string")
Oval/egg-shaped enlarged heart
Plethoric lung fields (increased pulmonary vascular markings - as blood recirculates in pulmonary circuit)

Viva: Why can TGA survive without intervention?

The two circulations are completely separate in TGA → incompatible with life.
Survival depends on mixing: PFO, ASD, VSD, PDA.
Emergency management: IV Prostaglandin E1 (PGE1) to keep PDA open; then Rashkind balloon atrial septostomy (to create ASD); definitive: Arterial switch operation (Jatene procedure).

PART 16: PROSTHETIC VALVE

Key X-Ray Finding

Radio-opaque valve ring visible in cardiac region
Sternotomy wires (median sternotomy sutures) - vertical wire along sternum
Mitral valve position: Behind heart (lateral view: posterior, lower)
Aortic valve position: Anterior, upper

Types of Prosthetic Valves:

Type	Appearance	Notes
Mechanical (e.g., St Jude's bileaflet)	Metallic circular disc/ring	Needs lifelong anticoagulation (warfarin)
Tissue/Bioprosthetic (e.g., porcine)	Metal ring only (less visible)	No anticoagulation needed (except initial 3 months)

PART 17: MULTIPLE MYELOMA - LYTIC LESIONS

Key X-Ray Finding (Skull/Ribs/Spine)

Multiple "punched out" lytic lesions (no sclerotic margin) = "Pepper pot skull"
Ribs: multiple lytic lesions, pathological fractures
Vertebrae: vertebral collapse/compression fractures
Diffuse osteoporosis
NO osteoblastic lesions (unlike prostate/breast metastases)

Viva: Why are lytic lesions seen?

Myeloma cells secrete RANKL and MIP-1α → activate osteoclasts → bone resorption → lytic lesions. No osteoblastic response because myeloma inhibits Wnt signaling → no new bone formation.

Myeloma Diagnosis (CRAB criteria):

Calcium elevated (hypercalcemia >11 mg/dL)
Renal failure (creatinine >2 mg/dL)
Anemia (Hb <10 g/dL)
Bone lesions (lytic lesions or osteoporosis)

PART 18: HAIR-ON-END APPEARANCE - THALASSEMIA

Key X-Ray Finding (Skull)

Hair-on-end appearance (also called "brush skull"): Perpendicular striations of bone trabeculae radiating outward from the outer table of the skull
Due to marrow hyperplasia (expanding erythropoietic tissue) causing widening of diploic space and perpendicular bony spicules
Maxillary hypertrophy → "Chipmunk facies" (protrusion of maxilla, hair-on-end appearance of maxilla)
Thinning of cortex

Other causes of Hair-on-End appearance:

Sickle cell anemia (most classic)
Thalassemia major (Beta thalassemia)
Iron deficiency anemia (severe, chronic, in children)
Hereditary spherocytosis
G6PD deficiency

Why in thalassemia?

Beta thalassemia major → severe hemolytic anemia → compensatory massive expansion of bone marrow → marrow space widens → cortex thins → new bone spicules form perpendicular to cortex.

PART 19: STEEPLE SIGN (CROUP) / THUMB SIGN (EPIGLOTTITIS)

Steeple Sign - Croup (Acute Laryngotracheobronchitis)

Key X-Ray Finding (AP neck/chest):

Steeple sign / Church spire sign / Inverted V sign: Narrowing of subglottic trachea giving a characteristic pointed, steeple-like tapering
Cause: Subglottic edema in acute viral croup
Most common organism: Parainfluenza virus type 1
Age: 6 months to 3 years
Clinical: Inspiratory stridor, barking (seal-like) cough, low grade fever

Thumb Sign - Epiglottitis

Key X-Ray Finding (Lateral neck):

Thumb sign: Swollen, round, thumb-like enlargement of epiglottis (normally thin and finger-like)
Cause: Haemophilus influenzae type b (Hib) - most common; also Strep. pyogenes
Age: 2-7 years (older than croup)
Clinical: High fever, "3 Ds" - Drooling, Dysphagia, Distress; "Tripod position" (sitting forward, neck extended, leaning on hands); DO NOT examine throat in an uncontrolled setting (can precipitate complete airway obstruction)
Management: Intubation/airway protection first; IV antibiotics (3rd gen cephalosporins)

PART 20: FOREIGN BODY

Key X-Ray Rules

Location	PA View	Lateral View
Esophagus	Round/coin shape (flat surface faces forward)	Oblique/slit shape (edge-on)
Trachea	Oblique/slit shape (edge-on)	Round shape (flat surface faces sideward)

Memory Aid:

Esophagus: En face (flat) on PA = round coin - esophagus is in the coronal plane
Trachea: Thin on PA = oblique - trachea is in the sagittal plane

Why?

The trachea is a sagittal (front-back) tube; the esophagus lies in the coronal plane posteriorly. A coin (flat object) in the esophagus lies with its flat face toward the X-ray beam (AP view) → looks round. In the trachea, it lodges in the coronal plane → appears edge-on (oblique) in AP view.

PART 21: LARGE BOWEL OBSTRUCTION (ABDOMINAL X-RAY)

Key X-Ray Findings

Feature	Description
Dilated bowel loops	>6 cm for colon (>9 cm for cecum)
Peripheral distribution	Loops in the periphery/flanks (colon frame pattern)
Haustrations	Incomplete septa that do NOT cross the full diameter of bowel (vs. valvulae conniventes in small bowel)
Absent gas in rectum	Complete obstruction

Causes:

Carcinoma colon (most common in adults > 50 years)
Volvulus (sigmoid, cecal)
Diverticular disease
Hirschsprung's disease (in children)

PART 22: COFFEE BEAN APPEARANCE - SIGMOID VOLVULUS

Key X-Ray Finding

Coffee bean sign / Omega sign / Bent inner tube sign
Massively dilated loop of sigmoid colon folded on itself, pointing toward right upper quadrant
"Inverted U" shape with central crease (like a coffee bean)
Loss of haustra in the affected segment
Dilated sigmoid occupies most of the abdomen

Viva: Management of Sigmoid Volvulus

Non-surgical (first line): Sigmoidoscopic/colonoscopic decompression + rectal tube
Surgical: Sigmoid resection (Hartmann's procedure or primary anastomosis) if decompression fails or gangrene

PART 23: SMALL BOWEL OBSTRUCTION

Key X-Ray Findings

Feature	Description
Dilated small bowel loops	>3 cm diameter
Central distribution	Loops in center of abdomen (vs. periphery in LBO)
Valvulae conniventes	Thin folds that cross the COMPLETE diameter of bowel (vs. haustra in LBO) - "stack of coins"
Absent gas in colon/rectum	Below the obstruction
Step-ladder pattern	Multiple air-fluid levels at different heights on erect view

Causes:

Adhesions (most common - post-surgical)
Hernia (inguinal, femoral, incisional)
Intussusception (children)
Volvulus, tumor, Crohn's disease

SBO vs LBO Summary:

Feature	SBO	LBO
Location	Central	Peripheral (frame)
Folds	Valvulae conniventes (complete)	Haustra (incomplete)
Diameter	>3 cm	>6 cm (>9 cm cecum)
Air-fluid levels	Multiple, different heights	Fewer, larger

PART 24: AIR UNDER DIAPHRAGM (PNEUMOPERITONEUM)

Key X-Ray Finding

Crescent of air seen under the diaphragm (right side more easily seen, against liver)
Best seen on: Erect chest X-ray (most sensitive), left lateral decubitus, or upright abdominal X-ray
As little as 1 mL of free air can be detected on CT; CXR detects from ~10 mL

Cause: Hollow viscus perforation

Peptic ulcer perforation (most common - duodenal >> gastric)
Colonic perforation (diverticulitis, carcinoma, iatrogenic)
Appendix perforation
Typhoid ulcer perforation (causes pneumoperitoneum + peritonitis)
Post-surgical (normal for 7-10 days after abdominal surgery)

Exceptions (Pneumoperitoneum WITHOUT peritonitis):

Pneumatosis cystoides intestinalis
Post-laparoscopy/laparotomy
Vaginal/perineal entry of air (Fothergill's sign)

Viva: What is the Rigler sign (Double wall sign)?

When there is large pneumoperitoneum, both the inner (mucosa) AND outer (serosa) walls of the bowel become visible → gas on both sides of the bowel wall. Normally only the inner surface is seen.

PART 25: PROCEDURES (DEVICES ON CXR)

Pigtail Catheter / ICD (Intercostal Drain)

Device	Appearance on CXR	Use
Pigtail catheter	Thin coiled catheter, usually in pleural space or pericardium	Pleural effusion, small pneumothorax, pericardial effusion
ICD (Intercostal drain / Chest tube)	Large, thick tube with radiopaque stripe/marker, tip in pleural space	Large pneumothorax, hemothorax, large pleural effusion

Correct ICD tip position: Lung apex for pneumothorax; base for effusion

Pacemaker

Transvenous pacemaker leads: Radio-opaque leads entering via subclavian/cephalic vein → RV apex
Generator (pulse generator/box): Infraclavicular region (usually left)
Temporary pacemaker: Thicker lead via femoral/subclavian, tip in RV
Indications: Complete heart block (3° AV block), sick sinus syndrome, 2° Mobitz type II AV block

Central Venous Catheter (CVC)

Radiopaque catheter with tip in Superior Vena Cava (SVC) at the level of carina
Entry: Internal jugular (IJV) or subclavian
Complications on CXR: Pneumothorax, hemothorax, malposition (tip in R atrium/RV = arrhythmia risk)

PART 26: RUGGER JERSEY SPINE - HYPERPARATHYROIDISM

Key X-Ray Finding (Lateral spine)

Rugger jersey spine: Alternating dense (sclerotic) end-plates and lucent vertebral body centers, resembling the horizontal stripes of a rugby jersey
Cause: Subperiosteal bone resorption at upper and lower endplates + reactive sclerosis at endplates
Seen in: Secondary hyperparathyroidism (chronic renal failure - most common), Primary hyperparathyroidism (rare)

Other skeletal X-ray findings of Hyperparathyroidism:

Subperiosteal bone resorption: Radial aspect of middle phalanges (most sensitive sign)
Salt and pepper skull: Granular mottling due to trabecular resorption
Brown tumors: Well-defined lytic lesions (giant cell tumors of bone)
Osteitis fibrosa cystica: von Recklinghausen disease of bone
Band keratopathy: Not X-ray but clinical sign (calcium deposition in cornea)

PART 27: BAMBOO SPINE - ANKYLOSING SPONDYLITIS

Key X-Ray Finding (Lateral/AP lumbar-thoracic spine)

Bamboo spine: Syndesmophytes (ossification of annulus fibrosus) + fusion of vertebral bodies → continuous column of bone resembling a bamboo stick
Syndesmophytes: Vertical bony bridges between vertebrae (vs. osteophytes in OA = horizontal)
Squaring of vertebrae: Loss of anterior concavity → "square vertebrae" (early sign)
Trolley track sign (AP view): 3 vertical white lines (ossified supraspinous ligament + both sacroiliac joints) = "trolley track" or "railroad track"
Sacroiliitis: Bilateral, symmetrical (earliest sign - begins here) → sclerosis + erosions + fusion
Dagger sign: Ossification of supraspinous/interspinous ligaments → single midline dense line

HLA association: HLA-B27 (90% of AS patients)

Viva: What is the difference between syndesmophyte and osteophyte?

Syndesmophyte: Ossification of the outer annular fibers; runs vertically; seen in AS and DISH
Osteophyte: Bone spur from vertebral body; runs horizontally; seen in OA/DJD

PART 28: RHEUMATOID ARTHRITIS (HAND X-RAY)

Key X-Ray Findings

Feature	Description
Periarticular osteoporosis	Juxta-articular bone loss (earliest sign)
Joint space narrowing	Uniform, bilateral, symmetrical
Marginal erosions	"Bare area" erosions at joint margins (outside synovial reflection)
Soft tissue swelling	Spindle-shaped swelling of PIP and MCP joints
Subluxation	Ulnar drift (MCP joints), swan neck deformity, boutonnière deformity
Late changes	Ankylosis, severe deformity, mutilans (arthritis mutilans)

Joints involved (RA vs OA):

Feature	RA	OA
Joint	MCP, PIP, wrist	DIP, PIP (Heberden/Bouchard)
Symmetry	Bilateral symmetric	Asymmetric
Osteoporosis	Periarticular	None
Osteophytes	No	Yes
Joint space	Uniform narrowing	Asymmetric narrowing

PART 29: SCOLIOSIS

Key X-Ray Finding (PA chest/spine)

Lateral curvature of the spine > 10° (Cobb angle)
S-shaped or C-shaped curve
Compensatory curves may be present
Rib hump (rib rotation) on forward bending (Adam's forward bend test)

Cobb Angle measurement:

Draw lines along the end-plates of the most tilted vertebrae at top and bottom of curve
Measure the angle between perpendiculars to these lines

Classification:

Angle	Management
<20°	Observation
20-40°	Bracing (Milwaukee brace)
>40-50°	Surgical - Harrington rod/pedicle screw fusion

Causes:

Idiopathic (most common - 80%): Adolescent idiopathic scoliosis (AIS), right thoracic curve in teenage girls
Congenital (hemivertebra, block vertebra)
Neuromuscular (cerebral palsy, muscular dystrophy, polio)
Secondary (leg length discrepancy, pain)

PART 30: KYPHOSIS

Key X-Ray Finding (Lateral spine)

Increased anterior curvature (forward bowing) of the thoracic spine
Kyphotic angle > 50° (Cobb method in thoracic spine)

Causes:

Type	Cause
Postural	Adolescent, correctable
Scheuermann's disease	Juvenile kyphosis; ≥5° anterior wedging in ≥3 consecutive vertebrae
Osteoporotic	Vertebral compression fractures (elderly females)
TB (Pott's disease)	Gibbus - angular kyphosis (sharp angular deformity) - vertebral body destruction
Ankylosing spondylitis	Thoracic hyperkyphosis with bamboo spine
Congenital	Hemivertebra

Viva: What is Gibbus deformity?

Angular kyphosis (sharp forward angulation) at a single level due to vertebral body collapse/destruction. Most common cause in India: Pott's disease (spinal tuberculosis), affecting lower thoracic/upper lumbar vertebrae (T10-L1 most common).

QUICK REVISION SUMMARY TABLE

X-Ray	Classic Sign	Key Diagnosis
Blunted CP angle + meniscus	Meniscus sign	Pleural effusion
No lung markings + pleural line	Visceral pleural line	Pneumothorax
Deep radiolucent sulcus (supine)	Deep sulcus sign	Pneumothorax (ICU)
Air-fluid level, straight line	Air-fluid level	Hydropneumothorax
Thick-walled cavity + air-fluid	Cavitation	Lung abscess
Patchy opacity + air bronchogram	Air bronchogram	Consolidation
S-shaped minor fissure	Golden S sign	RUL collapse + hilar mass
Triangular opacity left heart	Sail sign	LLL collapse
1-3mm bilateral nodules	Miliary pattern	Miliary TB
Spiculated mass ± cavity	Spiculation	Bronchogenic Ca
Multiple round bilateral nodules	Cannon ball	Pulmonary metastases
CT ratio >0.5	Cardiomegaly	CCF, cardiomyopathy
Globular heart	Water bottle/money in bag	Pericardial effusion
Boot-shaped heart, oligemic fields	Coeur en sabot	Tetralogy of Fallot
Snowman/figure-of-8	Snowman sign	TAPVR (supracardiac)
Egg on string	Egg on string	TGA
Metal ring in heart	Radio-opaque valve	Prosthetic valve
Punched-out lytic lesions skull	Pepper pot skull	Multiple myeloma
Perpendicular bony spicules skull	Hair-on-end	Thalassemia/Sickle cell
Subglottic narrowing	Steeple sign	Croup
Enlarged round epiglottis	Thumb sign	Epiglottitis
Round coin on PA (chest)	Coin shape on PA	Esophageal FB
Peripheral loops + haustra	Haustrations	Large bowel obstruction
Coffee bean / omega sign	Coffee bean	Sigmoid volvulus
Central loops + valvulae	Stack of coins	Small bowel obstruction
Crescent air under diaphragm	Pneumoperitoneum	Hollow viscus perforation
Alternating dense/lucent endplates	Rugger jersey	Hyperparathyroidism
Vertical syndesmophytes + fusion	Bamboo spine	Ankylosing spondylitis
Marginal erosions, ulnar drift	RA changes	Rheumatoid arthritis
Lateral curve >10°	Scoliosis	Idiopathic (adolescent)
Anterior thoracic curve	Kyphosis	Scheuermann's, TB (Gibbus)

This covers every case in Dr. Jayaraj's X-ray series with full OSCE presentation format, radiological signs, causes, and viva questions. All content is based on standard references (Harrison's 22E, Davidson's, Robbins Pathology, Bailey & Love Surgery).

Complete long case presentation, examination procedures, investigations, localisation management,and discussion,viva questions and answers for cns -stroke - long case for medicine practical examination in Madras medical college,chennai , give everything I need to know and should be knowing with regards to cns case

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Now I have everything needed. Here is the complete, exhaustive guide:

CNS LONG CASE - STROKE

Complete Guide for Medicine Practical Examination

Madras Medical College, Chennai - II MBBS / III MBBS

PART 1: HOW TO PRESENT A CNS LONG CASE

Opening Line (Mandatory)

"I have examined Mr./Mrs. [Name], a [age]-year-old [male/female], [occupation], from [place], who presented with complaints of..."

PART 2: HISTORY TAKING - COMPLETE FORMAT

Chief Complaints (in order of duration)

Classic stroke presentation:

Sudden onset weakness of right/left upper and lower limb - [duration]
Deviation of angle of mouth - [duration]
Inability to speak / slurring of speech - [duration]
± Headache, vomiting, loss of consciousness

History of Presenting Illness (HOPI)

Onset

Sudden (seconds to minutes): Embolic stroke (most common)
Stuttering/stepwise: Thrombotic stroke (TIA may precede)
Gradual: Rarely thrombosis; consider mimics (tumor, abscess, subdural hematoma)

Progression

Improving from onset: TIA (resolves <24h) or completed stroke with early recovery
Progressive worsening: Extending thrombus, cerebral edema, hemorrhage
Fluctuating: Hemodynamic stroke (stenosis + hypotension)

Ask about EACH symptom:

Symptom	Ask
Weakness	Which side? Which limb first? Face involved? Progression? Can they walk/hold objects?
Speech	Cannot produce words (Broca) OR cannot understand (Wernicke)? Slurring only (dysarthria)?
Headache	Sudden "thunderclap" (SAH)? Gradual (ICH)?
Seizures	Onset or later - indicates cortical involvement
Loss of consciousness	Duration, complete/partial - suggests large hemisphere or brainstem
Visual disturbance	Transient monocular blindness (amaurosis fugax = carotid TIA), hemianopia
Swallowing difficulty	Dysphagia - brainstem or bilateral hemisphere
Bladder/bowel	Incontinence - frontal lobe or bilateral involvement

Past History

Previous TIA or stroke (most important risk factor for repeat stroke)
Hypertension (duration, treatment, control)
Diabetes mellitus
Ischemic heart disease / Atrial fibrillation / Recent MI
Rheumatic heart disease (mitral stenosis → AF → embolism)
Hyperlipidemia
Oral contraceptive pill use (young women with stroke)
Migraine with aura
Blood disorders (sickle cell, polycythemia, thrombophilia)

Personal History

Smoking: Pack-years (major risk factor - doubles stroke risk)
Alcohol: Chronic heavy use (hypertension, coagulopathy)
Diet, physical activity
Drug use (cocaine, amphetamines - young stroke)

Family History

Premature stroke, hypertension, diabetes, cardiac disease, CADASIL, sickle cell anemia

Drug History

Antihypertensives (compliance?), antidiabetics, anticoagulants, antiplatelet agents, oral contraceptives

Social History

Handedness (determines dominant hemisphere - 95% right-handed people are left hemisphere dominant)
Occupation, dependents, housing
Support available for rehabilitation

PART 3: GENERAL PHYSICAL EXAMINATION

Always perform and report:

Finding	Significance in Stroke
Conscious level	GCS / AVPU - indicates severity
Posture	Hemiplegia posture: arm flexed, leg extended (Wernicke-Mann posture)
Built and nutrition	Obese (vascular risk), cachexia (malignancy)
Pallor	Anemia as cause of TIA; polycythemia (no pallor, plethoric)
Cyanosis	Cyanotic heart disease causing paradoxical embolism
Clubbing	Infective endocarditis, cyanotic CHD
Icterus	Liver disease, coagulopathy
Lymphadenopathy	Malignancy (metastasis mimicking stroke)
Pulse	Rate, rhythm (irregularly irregular = AF), volume, character
Blood pressure	Both arms (difference >20 mmHg = subclavian steal, aortic dissection); hypertension is the #1 modifiable risk factor
Temperature	Fever (infective endocarditis, vasculitis, cerebral abscess)
Tongue	Deviation (XII nerve - LMN: toward lesion; UMN: away from lesion - but in acute stroke may deviate toward lesion due to ipsilateral tongue weakness)
Neck	Carotid bruit (ipsilateral ICA stenosis)
Eyes	Xanthelasma, corneal arcus (hyperlipidemia)
Skin	Livedo reticularis (antiphospholipid syndrome), petechiae (endocarditis), café-au-lait spots

PART 4: NEUROLOGICAL EXAMINATION - DETAILED PROCEDURE

A. HIGHER MENTAL FUNCTIONS

Consciousness Level

GCS (Glasgow Coma Scale):

Component	Score
Eye opening: Spontaneous/to voice/to pain/none	4/3/2/1
Verbal response: Oriented/confused/words/sounds/none	5/4/3/2/1
Motor response: Obeys/localizes/withdraws/abnormal flexion/extension/none	6/5/4/3/2/1

Total: 15 = normal; 13-15 = mild; 9-12 = moderate; ≤8 = severe (intubation threshold)

Orientation

Time (date, day, month, year, time of day)
Place (where are we now? which floor?)
Person (what is your name? who am I?)

Attention and Concentration

Digit span (forward: 7±2 normal; backward: 5±2 normal)
Serial 7s (100-7=93-86-79...)
Months of year backward

Memory

Immediate memory: Repeat 3 objects immediately
Short-term/Recent memory: Recall same 3 objects after 5 minutes
Long-term/Remote memory: Personal events (DOB, marriage, etc.), general knowledge

Language (Critical in stroke)

Assess in sequence:

Spontaneous speech: Fluency, prosody, paraphasias, word-finding
Comprehension: Give 1-step, 2-step, 3-step commands
Repetition: "No ifs, ands, or buts" / "The cat sat on the mat"
Naming: Common objects (pen, watch, collar), body parts
Reading: Ask patient to read a sentence
Writing: Ask patient to write their name / a sentence

Aphasia Classification:

Type	Fluency	Comprehension	Repetition	Location
Broca (Expressive)	NON-fluent	Intact	Impaired	Left posterior inferior frontal gyrus (F3) - Broca's area (BA 44, 45)
Wernicke (Receptive)	Fluent	Impaired	Impaired	Left posterior superior temporal gyrus - Wernicke's area (BA 22)
Conduction	Fluent	Intact	Severely impaired	Arcuate fasciculus
Global	Non-fluent	Impaired	Impaired	Large left MCA territory
Transcortical Motor	Non-fluent	Intact	Intact	Anterior to Broca's area
Transcortical Sensory	Fluent	Impaired	Intact	Posterior to Wernicke's area
Anomic	Fluent	Intact	Intact	Variable (angular gyrus often)

Other Higher Functions

Praxis: Can they mimic brushing teeth, combing hair, saluting? (apraxia = left hemisphere parietal)
Gnosis: Identify object by touch (stereognosis), by sight (visual agnosia)
Visuospatial: Draw a clock, copy a cube (right hemisphere parietal)
Neglect/Inattention: Bilateral simultaneous stimulation (right hemisphere parietal)
Anosognosia: Denial of illness (right parietal)
Calculation (Acalculia): Simple arithmetic - angular gyrus (part of Gerstmann syndrome)
Gerstmann syndrome: Acalculia + Agraphia + Left-right disorientation + Finger agnosia → Left angular gyrus lesion

B. CRANIAL NERVE EXAMINATION

CN I - Olfactory

Test each nostril separately with coffee/soap/vanilla (avoid pungent like ammonia - stimulates CN V)
Rarely affected in stroke; loss suggests frontal lobe lesion or frontobasal fracture

CN II - Optic Nerve

Visual Acuity:

Snellen chart at 6 meters (6/6 = normal)
Bedside: count fingers, hand movements, light perception

Visual Fields (confrontation method):

Stand 1 meter in front; cover one eye each time; compare patient's field to yours
Test all 4 quadrants with wiggling finger

Field defects in stroke:

Defect	Location of Lesion
Monocular blindness	Ipsilateral optic nerve or retinal artery (amaurosis fugax = carotid TIA)
Bitemporal hemianopia	Optic chiasm (pituitary tumor)
Homonymous hemianopia	Contralateral optic tract / LGN / optic radiation / occipital cortex
Upper quadrantanopia ("pie in the sky")	Contralateral temporal lobe (Meyer's loop)
Lower quadrantanopia ("pie on the floor")	Contralateral parietal lobe
Homonymous hemianopia with macular sparing	Occipital cortex infarction (posterior cerebral artery - dual blood supply to macula)

Fundoscopy (ophthalmoscopy):

Papilloedema: Raised ICP (blurred disc margins, loss of cup, engorged veins)
Hypertensive retinopathy: AV nipping, silver/copper wiring, flame hemorrhages, cotton wool spots
Diabetic retinopathy
Emboli visible in retinal vessels (Hollenhorst plaques = cholesterol emboli - carotid origin)

Pupillary Reactions:

Direct and consensual light reflex
RAPD (Relative Afferent Pupillary Defect / Marcus Gunn pupil): Swinging flashlight test - afferent defect
Dilated fixed pupil (CN III palsy): Ipsilateral posterior communicating artery aneurysm, herniation
Horner syndrome (ptosis, miosis, anhidrosis): Lateral medullary syndrome (Wallenberg), carotid dissection, pontine lesion

CN III, IV, VI - Ocular Movements

Inspection: Ptosis, proptosis, squint, head tilt Pursuit movements: H-pattern; note restriction, diplopia, nystagmus Conjugate gaze:

Horizontal gaze center: PPRF (paramedian pontine reticular formation) in pons
Frontal eye field (FEF) lesion: Eyes deviate TOWARD the lesion (ipsilesional) - "the eyes look at the lesion" in cortical stroke
Pontine lesion: Eyes deviate AWAY from lesion (contralateral) - "the eyes look away from the lesion"
MLF (Medial longitudinal fasciculus) lesion → Internuclear ophthalmoplegia (INO): impaired adduction, nystagmus of abducting eye; seen in MS, brainstem stroke

CN V - Trigeminal

Sensory: Cotton wool (light touch), pin (pain), warm/cold (temperature) over V1 (forehead), V2 (cheek), V3 (jaw) - each side
Motor: Clench teeth (feel masseters), open mouth against resistance (pterygoids - deviation to weak side in LMN)
Corneal reflex: Afferent V1, efferent VII - tests pontine function

CN VII - Facial Nerve

UMN vs LMN facial palsy - most important distinction in stroke:

Feature	UMN (Central/Supranuclear)	LMN (Peripheral)
Forehead sparing	YES - upper face spared (bilateral cortical representation)	NO - entire face affected (forehead also weak)
Nasolabial fold	Flattened on opposite side	Flattened on same side
Eye closure	Intact (can close eye)	Weak/incomplete (Bell's phenomenon)
Emotional smile	Lost (dissociation)	Lost equally
Cause	Stroke (internal capsule/cortex)	Bell's palsy, parotid tumor, petrous bone fracture

Testing:

Raise eyebrows (frontalis - upper face)
Close eyes tightly (orbicularis oculi)
Show teeth / smile (orbicularis oris - lower face)
Puff cheeks (buccinator)

CN VIII - Vestibulocochlear

Whisper test / Rinne and Weber (tuning fork 256/512 Hz)
Vestibular: Nystagmus, HINTS exam in acute vertigo (Head Impulse, Nystagmus direction, Test of Skew)

CN IX, X - Glossopharyngeal and Vagus

Voice quality: Hoarse (CN X), nasal (palatal palsy)
Swallowing: Dysphagia
Soft palate: Say "Aah" - rises midline; in UMN bilateral: both sides intact; in LMN: palate deviates AWAY from lesion
Gag reflex: Afferent IX, efferent X

CN XI - Accessory

Sternomastoid: Turn head against resistance (tests contralateral SCM)
Trapezius: Shrug shoulders against resistance

CN XII - Hypoglossal

Protrude tongue: Deviates TOWARD lesion in LMN (CN XII nucleus / nerve)
In UMN (internal capsule stroke): tongue deviates AWAY from lesion (toward hemiplegia side) - actually deviates toward the weaker side of the body

C. MOTOR SYSTEM EXAMINATION

Inspection

Wasting/atrophy (LMN or disuse)
Fasciculations (LMN - denervation)
Posture in hemiplegia: Wernicke-Mann posture - arm flexed and adducted, leg extended (due to spasticity - flexors stronger in arm, extensors stronger in leg)
Abnormal movements: Tremor, chorea, athetosis, hemiballismus

Tone

Testing method: Passive movement of joint through full range; assess resistance
Shoulder: rotation; Elbow: flex/extend; Wrist: flex/extend/pronate/supinate
Hip: flex/extend/rotate; Knee: flex/extend ("knee rolling" test); Ankle: dorsiflexion

Tone	Characteristics	Cause
Hypotonia	Decreased resistance	LMN, cerebellum, acute UMN (spinal shock)
Spasticity	Velocity-dependent increased tone, "clasp-knife" release	UMN (pyramidal) - stroke (after acute phase)
Rigidity	Constant increased tone throughout movement	Basal ganglia (Parkinson's: "lead-pipe" or "cogwheel")
Paratonia (gegenhalten)	Resistance increases with examiner's force	Frontal lobe lesion, dementia

Note: In acute stroke - tone is FLACCID (spinal shock equivalent). Spasticity develops over days to weeks.

Power

MRC Grading of Power:

Grade	Description
0	No contraction
1	Flicker/trace contraction
2	Movement with gravity eliminated (horizontal)
3	Movement against gravity but not resistance
4	Movement against some resistance (4-, 4, 4+)
5	Normal power

Muscles to test (systematic):

Joint	Movement	Nerve/Root	Muscle
Shoulder	Abduction	C5, Axillary	Deltoid
Elbow	Flexion	C5-C6, Musculocutaneous	Biceps
Elbow	Extension	C7, Radial	Triceps
Wrist	Extension	C7, Radial	ECRL, ECRB
Fingers	Grip	C8, T1	Flexors
Fingers	Intrinsics	T1, Ulnar	Interossei
Hip	Flexion	L2-L3, Femoral	Iliopsoas
Hip	Extension	L4-S1, Inferior gluteal	Gluteus maximus
Knee	Extension	L3-L4, Femoral	Quadriceps
Knee	Flexion	L5-S1, Sciatic	Hamstrings
Ankle	Dorsiflexion	L4-L5, Deep peroneal	Tibialis anterior
Ankle	Plantar flexion	S1, Tibial	Gastrocnemius

Pattern of weakness in stroke (UMN hemiplegia):

Upper limb: Extensors weaker than flexors (arm tends to flex)
Lower limb: Flexors weaker than extensors (leg tends to extend)
This explains circumduction gait in hemiplegia

Coordination

Finger-nose test: Ask patient to touch own nose then examiner's finger alternately; look for intention tremor, past-pointing (dysmetria)
Heel-shin test: Run heel down opposite shin from knee to foot; look for dysmetria
Rapid alternating movements (Dysdiadochokinesia): Alternate pronation-supination rapidly; one hand clapping on other
Romberg test: Stand with feet together, eyes open then closed; positive (sways/falls with eyes closed) = sensory ataxia; with cerebellar ataxia, patient sways with eyes open AND closed

Involuntary Movements

Note: tremor (at rest vs intention), chorea, athetosis, ballismus, tics

D. REFLEXES

Deep Tendon Reflexes (DTRs)

Reflex	How to Elicit	Root
Biceps	Thumb on biceps tendon, strike thumb	C5-C6
Supinator (Brachioradialis)	Strike brachioradialis at lower forearm	C5-C6
Triceps	Strike triceps tendon above olecranon (arm across chest)	C7
Knee (Patellar)	Tap patellar tendon, legs hanging; note quadriceps contraction	L3-L4
Ankle (Achilles)	Foot dorsiflexed; strike Achilles tendon	S1

Grading:

0: Absent; 1+: Diminished; 2+: Normal; 3+: Brisk (no clonus); 4+: Very brisk with clonus

UMN signs: Hyperreflexia (3-4+), clonus

Clonus testing: Sudden dorsiflexion of foot at ankle and maintain pressure - rhythmic oscillations (>3 beats = pathological); in UMN lesions

Superficial Reflexes

Reflex	Stimulus	Response	Lost in
Plantar	Stroke lateral sole foot upward	Toe flexion (normal)	-
Babinski sign	Same	Extension of big toe + fanning	UMN lesion
Abdominal reflex	Stroke abdominal wall (4 quadrants)	Umbilicus pulls toward	Lost in UMN lesion (upper: T8-9, lower: T10-12)
Cremasteric	Stroke inner thigh (males)	Testis elevates	Lost in UMN

Plantar Response (Most Important Sign in Stroke!)

Technique: Use key or orange stick; stroke from heel along lateral sole, then curve medially toward ball of foot
Flexor response (Normal): Big toe flexes downward
Extensor response (Babinski sign - Positive/Abnormal): Big toe extends (dorsiflexes) + other toes fan = UMN lesion

Variants of Babinski:

Chaddock: Stroke lateral aspect of dorsum of foot
Oppenheim: Stroke down tibia
Gordon: Squeeze calf muscle
Schafer: Squeeze Achilles tendon

Primitive/Pathological Reflexes (indicate frontal lobe disease/regression)

Grasp reflex: Stroke palm → patient grasps examiner's fingers (frontal lobe)
Palmomental reflex: Scratch thenar eminence → ipsilateral chin muscle contracts
Snout reflex: Tap upper lip → lip pursing
Rooting reflex: Stroke cheek → head turns toward stimulus

E. SENSORY EXAMINATION

Primary Sensations

1. Superficial sensations (anterior spinothalamic tract):

Light touch: Cotton wool; ask patient to say "yes" when they feel it; compare both sides
Pain: Disposable pin; "sharp or blunt?"
Temperature: Test tubes of warm and cold water

2. Proprioception & Vibration (posterior columns / medial lemniscus):

Joint position sense (JPS): Hold distal phalanx of finger/toe by sides; move up or down; ask direction with eyes closed
Vibration sense: 128 Hz tuning fork on bony prominences (malleolus, tibial tuberosity, sternum)
Romberg test: Tests posterior column integrity

3. Cortical sensations (tested when primary sensations intact):

Stereognosis: Identify object by touch only (key, coin)
Graphesthesia: Number written on palm - identify
Two-point discrimination: Two points on fingertip (normal: 2-3 mm)
Tactile localization: Where did I touch?
Sensory extinction/Inattention: Touch both sides simultaneously

Dermatome reference (important for level localization):

C4: Shoulder; C6: Thumb; C7: Middle finger; C8: Little finger; T4: Nipple; T10: Umbilicus; L1: Inguinal; L4: Medial calf; S1: Lateral foot

F. GAIT AND STATION

Ask patient to walk (if able):

Gait Type	Description	Cause
Hemiplegic/Circumduction	Affected leg swings outward in arc, arm flexed	Hemiplegia (stroke) - spastic
Scissors gait	Both legs cross like scissors	Bilateral UMN (CP, bilateral stroke)
Steppage gait	High stepping, foot slap	Foot drop (common peroneal nerve, L4-L5)
Festinant	Small shuffling steps, forward stoop, loss of arm swing	Parkinson's disease
Cerebellar (ataxic)	Wide-based, reeling, unable to walk in tandem	Cerebellar disease
Sensory ataxic	Wide-based, stamps feet, Romberg positive	Posterior column disease
Apraxic	"Feet glued to floor," small steps, normal limb power	Frontal lobe disease (NPH, bilateral frontal infarcts)
Antalgic	Avoids weight on painful limb	Pain
Trendelenburg	Pelvis drops to opposite side	Gluteus medius weakness

G. MENINGEAL SIGNS (if indicated)

Neck stiffness: Passive neck flexion - resist (subarachnoid hemorrhage, meningitis)
Kernig's sign: With hip at 90°, extend knee - resist/pain (SAH, meningitis)
Brudzinski's sign: Passive neck flexion → spontaneous hip and knee flexion

PART 5: LOCALIZATION OF LESION - MOST IMPORTANT FOR VIVA

A. UMN vs LMN Hemiplegia

Feature	UMN (Stroke)	LMN
Wasting	Minimal (disuse only)	Marked
Fasciculations	Absent	Present
Tone	Increased (spasticity) - after acute phase	Decreased (flaccidity)
Power	Reduced	Reduced
DTRs	Increased (hyperreflexia)	Decreased/absent
Clonus	Present	Absent
Plantar	Extensor (Babinski +ve)	Flexor (normal)
Abdominal reflex	Absent	Present
Facial palsy	Upper face spared	Entire face involved

B. Localization Within CNS

1. CORTICAL (Cerebral Cortex) Lesion

Contralateral weakness (face + arm > leg, OR leg > arm depending on area)
Cortical signs: Aphasia, apraxia, agnosia, neglect, anosognosia, visual field defect (homonymous hemianopia)
Seizures (common in cortical stroke)
Sensory loss of cortical type (astereognosis, extinction)
No hemiplegia equally affecting face + arm + leg (somatotopic representation differs)

2. INTERNAL CAPSULE Lesion (Most common in stroke - lenticulostriate arteries)

Pure motor hemiplegia: Equally affecting face + arm + leg (ALL fibers pass through compact posterior limb)
No cortical signs (aphasia, seizures, visual field defect ABSENT or minimal)
Common cause: Lacunar infarct (small vessel disease - hypertension)
The posterior limb of IC carries: corticospinal (motor) + corticobulbar + thalamocortical (sensory)

3. BRAINSTEM Lesion

Crossed syndromes: Ipsilateral cranial nerve palsy + contralateral hemiplegia/hemisensory loss
(Cranial nerve nucleus = SAME side as lesion; pyramidal tract decussates BELOW = contralateral body)

4. SPINAL CORD

Brown-Séquard syndrome (hemisection): Ipsilateral UMN weakness + JPS/vibration loss; contralateral pain/temperature loss
Face NOT involved
Sensory level

C. Arterial Territory Syndromes

ANTERIOR CIRCULATION (Internal Carotid → ACA + MCA)

Middle Cerebral Artery (MCA) - Most common stroke artery

Division	Features
Total MCA territory	Contralateral hemiplegia (face + arm > leg), hemianesthesia, homonymous hemianopia, gaze deviation toward lesion, ± global aphasia (dominant) or neglect (non-dominant)
Superior division MCA	Contralateral hemiplegia (arm + face > leg), Broca aphasia (dominant), contralateral gaze deviation
Inferior division MCA	Wernicke aphasia (dominant) or neglect (non-dominant), homonymous hemianopia or superior quadrantanopia, minimal hemiparesis
Lenticulostriate (deep MCA branches)	Pure motor or sensorimotor lacunar stroke, internal capsule

Anterior Cerebral Artery (ACA)

Contralateral leg > arm weakness (motor cortex - leg area is on medial surface, ACA territory)
Frontal lobe signs: Abulia, grasp reflex, incontinence, apraxia
Bilateral ACA: Akinetic mutism

Internal Carotid Artery (ICA)

Combined ACA + MCA territory: Massive hemisphere infarction
Amaurosis fugax (transient monocular blindness) from ophthalmic artery involvement
Pulsatile tinnitus, Horner syndrome (carotid dissection)

POSTERIOR CIRCULATION (Vertebrobasilar)

Posterior Cerebral Artery (PCA)

Contralateral homonymous hemianopia with MACULAR SPARING (most characteristic)
Thalamic syndrome (Dejerine-Roussy): Contralateral hemisensory loss + central post-stroke pain
Alexia without agraphia (dominant): Left PCA, disconnecting left occipital cortex from language areas
Prosopagnosia (bilateral occipital): Cannot recognize faces
Vertical gaze palsy (top of basilar)

Lateral Medullary Syndrome (Wallenberg Syndrome) - POSTERIOR INFERIOR CEREBELLAR ARTERY (PICA)

Classic features (extremely important for viva):

Sign	Mechanism
Ipsilateral face pain/temperature loss	Ipsilateral V nucleus in medulla
Contralateral body pain/temperature loss	Contralateral spinothalamic tract crosses in medulla
Ipsilateral Horner syndrome	Ipsilateral descending sympathetic fibers
Ipsilateral cerebellar signs	Ipsilateral inferior cerebellar peduncle
Dysphagia, dysphonia, dysarthria	Ipsilateral IX, X nucleus (nucleus ambiguus)
Ipsilateral palatal paresis	Same
Nystagmus, vertigo, hiccups	Vestibular nucleus involvement
NO hemiplegia	Pyramids in anterior medulla - spared

Dissociated sensory loss: Face (ipsilateral) and body (contralateral) = Lateral medullary syndrome

Medial Medullary Syndrome (Anterior Spinal Artery / Vertebral Artery)

Contralateral hemiplegia (pyramids)
Contralateral loss of JPS and vibration (medial lemniscus)
Ipsilateral tongue deviation (CN XII)

Weber Syndrome (Midbrain - PCA or basilar)

Ipsilateral CN III palsy (dilated fixed pupil, ptosis, eye down and out)
Contralateral hemiplegia

Millard-Gubler Syndrome (Pons - Basilar artery)

Ipsilateral CN VI palsy (lateral gaze palsy)
Ipsilateral CN VII palsy (LMN facial palsy)
Contralateral hemiplegia

Foville Syndrome (Pons)

Ipsilateral CN VII (LMN facial palsy)
Ipsilateral conjugate gaze palsy (PPRF involved)
Contralateral hemiplegia

D. Lacunar Infarcts (Small Vessel Disease)

Classic lacunar syndromes (no cortical signs):

Syndrome	Features	Location
Pure Motor Hemiplegia	Face + arm + leg equally weak, NO sensory loss	Posterior limb IC, basis pontis
Pure Sensory Stroke	Hemisensory loss only	Thalamus (VPL nucleus)
Sensorimotor Stroke	Motor + sensory together	IC/thalamus junction
Dysarthria - Clumsy Hand Syndrome	Dysarthria + ipsilateral hand clumsiness	Basis pontis, IC genu
Ataxic Hemiparesis	Ipsilateral cerebellar ataxia + hemiparesis	Basis pontis, IC

PART 6: INVESTIGATIONS

Immediate (Emergency) Investigations

1. CT Brain - NON-CONTRAST (First and most important)

Done within 25 minutes of arrival
Purpose: RULE OUT HEMORRHAGE before giving thrombolysis
Ischemic stroke: May appear NORMAL in first 6 hours
- Early signs: Loss of grey-white differentiation, hyperdense MCA sign (thrombus in MCA), insular ribbon sign, effacement of sulci
Hemorrhagic stroke: Hyperdense (bright white) area
SAH: Hyperdense blood in basal cisterns

2. MRI Brain (DWI - Diffusion Weighted Imaging)

Most sensitive for early ischemic stroke (within minutes to hours)
DWI: Bright (restricted diffusion) in acute ischemia
ADC map: Dark in acute ischemia (confirms DWI finding)
FLAIR: Takes hours to become positive; good for old infarcts
MRA (MR Angiography): Shows vessel occlusion noninvasively
GRE/SWI: Detects hemorrhage (more sensitive than CT for chronic blood)

3. Blood Investigations (Routine)

Test	Reason
CBC	Anemia (TIA cause), polycythemia, thrombocytopenia
Blood glucose (STAT)	Hypoglycemia/hyperglycemia can mimic stroke - MUST RULE OUT
Coagulation (PT, APTT, INR)	Before thrombolysis, anticoagulation
Serum electrolytes, BUN, creatinine	Renal function, metabolic causes
LFT	Before anticoagulation
Lipid profile	Dyslipidemia as risk factor
HbA1c	Diabetes assessment
ECG	Atrial fibrillation, MI, LVH
Cardiac enzymes (Troponin)	Stroke can cause troponin rise; concurrent MI

4. Cardiac Investigations

Echocardiogram: Cardioembolism workup
- Transthoracic echo (TTE): LV thrombus, valvular disease, EF
- Transesophageal echo (TOE): PFO, LA thrombus, aortic atheroma (better than TTE)
24-hour Holter monitoring: Paroxysmal AF detection
Chest X-ray: Cardiomegaly, pulmonary edema, heart-lung ratio

5. Vascular Investigations

Carotid Doppler ultrasound: Carotid stenosis (>50% = significant, >70% = eligible for endarterectomy)
CT Angiography (CTA): Rapid, shows vessels from arch to circle of Willis
MR Angiography (MRA): Non-invasive vascular imaging
Digital Subtraction Angiography (DSA): Gold standard for vasculature (also therapeutic - thrombectomy)

6. Special Investigations (Young Stroke workup, <45 years)

Thrombophilia screen: Protein C, Protein S, AT III, Factor V Leiden, Prothrombin gene mutation
Antiphospholipid antibody syndrome: Lupus anticoagulant, anticardiolipin antibodies, anti-β2GPI
Homocysteine level (elevated = prothrombotic)
VDRL/TPHA (Syphilis - vasculitis causing stroke)
HIV serology
ANA, anti-dsDNA (SLE vasculitis)
Serum protein electrophoresis (paraproteinemia)
Drug screen (cocaine, amphetamines)
Sickle cell screen
Vasculitis workup: ANCA, ESR, CRP
CSF analysis (if meningitis/vasculitis suspected)
Genetic testing: CADASIL (NOTCH3 mutation), MELAS, Fabry disease

PART 7: MANAGEMENT

Acute Stroke Management - "Time is Brain"

(1.9 million neurons die per minute in ischemic stroke - Saver, 2006)

A. Immediate Stabilization (ABC)

Airway: Ensure patent; GCS ≤8 or aspiration risk → intubate
Breathing: O2 to maintain SpO2 >94% (avoid hyperoxia in non-hypoxic patients)
Circulation: IV access × 2; avoid hypotension (don't lower BP aggressively in first 24h unless giving thrombolysis)
Blood glucose: Treat hypoglycemia immediately; target BG 7.8-10 mmol/L; avoid dextrose in ischemic stroke (worsens outcome)
Temperature: Fever worsens ischemia; paracetamol for temperature >37.5°C
Positioning: Head of bed 0-15° in first 24h (improves cerebral perfusion); elevate to 30° if aspiration risk

B. Reperfusion Therapy (for ischemic stroke only)

IV Thrombolysis - tPA (Alteplase)

Dose: 0.9 mg/kg IV (max 90 mg); 10% as bolus over 1 minute, remaining 90% over 60 minutes
Time window: Within 4.5 hours of symptom onset (NINDS, ECASS III trials)
NIHSS: Usually 4-25 (very mild or very severe may not benefit)

Absolute Contraindications to tPA:

Hemorrhage on CT brain
Time of onset unknown (e.g., wake-up stroke - unless DWI-FLAIR mismatch criteria met)
BP >185/110 mmHg (treat first, then give tPA if achieved)
Blood glucose <2.7 or >22.2 mmol/L
Prior stroke or head trauma within 3 months
Recent intracranial/spinal surgery within 3 months
Platelet count <100,000
INR >1.7 or use of direct thrombin/factor Xa inhibitors
Active internal bleeding (except menstruation)
Seizure at onset (if neurological deficits are post-ictal)
CT showing large hypodensity (>1/3 MCA territory)

Mechanical Thrombectomy (Endovascular)

Large vessel occlusion (LVO): ICA, M1/M2 MCA, basilar artery, ACA
Time window: Up to 24 hours if penumbra demonstrated (DAWN/DEFUSE-3 trials)
Combined with IV tPA (bridging therapy)
Access via femoral artery → stent retriever or aspiration catheter

C. Blood Pressure Management

Situation	Target BP
Eligible for tPA	Lower to <185/110 before giving; maintain <180/105 for 24h after
NOT eligible for tPA	Allow permissive hypertension; only treat if >220/120 mmHg
ICH (hemorrhagic stroke)	Target SBP <140 mmHg (INTERACT-2)
After 24-72 hours	Gradual lowering to normal targets

First-line IV agents: Labetalol (IV), Nicardipine infusion, Hydralazine

D. Antiplatelet Therapy

Start within 24-48 hours (if thrombolysis not given, wait 24h after tPA)
Aspirin 300 mg loading dose, then 75 mg/day
Clopidogrel: For TIA or minor stroke - dual antiplatelet (Aspirin + Clopidogrel) for 21 days (POINT, CHANCE trials) then Clopidogrel alone
NOT for hemorrhagic stroke

E. Anticoagulation (for cardioembolic stroke - AF)

Warfarin (target INR 2-3) or DOACs (Rivaroxaban, Apixaban, Dabigatran)
Generally delayed 4-14 days after stroke (risk of hemorrhagic transformation)
Heparin NOT routinely used in acute ischemic stroke

F. Statin Therapy

High-intensity statin: Atorvastatin 40-80 mg (started acutely, continued long term)
LDL target: <1.8 mmol/L (<70 mg/dL) or >50% reduction

G. Acute Complications Management

Complication	Management
Cerebral edema/Raised ICP	Head 30°, avoid hypotonic fluids, Mannitol 0.25-1 g/kg IV 4-6 hrly, consider decompressive hemicraniectomy (large MCA infarct <60 years - HAMLET/DESTINY trials)
Seizures	Treat if occur; not routinely prophylactic
Dysphagia (aspiration)	Nil oral, NG tube feeding, swallowing assessment before oral feeds
DVT prophylaxis	TED stockings; LMWH after 24-48h if hemorrhage excluded
Urinary retention/incontinence	Catheterize if retention; remove early; bladder training
Pressure sores	Regular turning, pressure mattress
Constipation	Stool softeners, adequate hydration
Depression	Very common post-stroke; SSRIs if required

H. Hemorrhagic Stroke (ICH) Specific Management

Reverse anticoagulation: Vitamin K + FFP (for warfarin); Idarucizumab (for dabigatran); Andexanet alfa (for Xa inhibitors)
Platelet transfusion if thrombocytopenic
Surgical evacuation: For cerebellar hematoma >3 cm with hydrocephalus (LIFE-SAVING), superficial lobar ICH with deterioration
NOT recommended: Routine surgical evacuation for deep ICH (STICH trials)
Hyperglycemia control, temperature management

I. Secondary Prevention (Long-term)

Intervention	Details
Antiplatelets	Aspirin 75mg or Clopidogrel 75mg lifelong (ischemic non-cardioembolic stroke)
Anticoagulation	Warfarin/DOACs for AF, mechanical heart valve, hypercoagulable states
Statins	Atorvastatin 80mg lifelong
Antihypertensives	Target <130/80 mmHg (ACE inhibitor + thiazide most evidence)
Antidiabetics	Tight glycemic control; HbA1c <7%
Carotid endarterectomy (CEA)	Symptomatic carotid stenosis >70% within 2 weeks (NASCET, ECST trials); 50-69% with high risk features
Lifestyle	Smoking cessation, alcohol moderation, exercise, weight loss

J. Rehabilitation (Multidisciplinary - Begin within 24-48h)

Physiotherapy: Mobilization, ambulation, spasticity management
Occupational therapy: ADL training, splints, assistive devices
Speech therapy: Aphasia rehabilitation, dysphagia management
Neuropsychology: Cognitive rehabilitation, depression screening
Nursing: Pressure care, continence, nutrition
Social worker: Discharge planning, home modifications, carer support

PART 8: CLINICAL CASE DISCUSSION FORMAT

Summary of Findings (How to present to examiner)

"On examination, this patient has [right/left] hemiplegia with [UMN facial palsy / no facial involvement]. The tone is [increased/decreased], power is [grade] in upper limb and [grade] in lower limb. Deep tendon reflexes are [exaggerated/absent]. Plantar response is [extensor bilaterally / unilaterally on the right]. There is [homonymous hemianopia / no visual field defect]. [Broca's aphasia / Wernicke's aphasia / No aphasia] is present. Based on these findings, I localize the lesion to the [left MCA territory / internal capsule / brainstem] because [explain reasoning]."

Differential Diagnosis of Hemiplegia

Ischemic stroke (most common)
Intracerebral hemorrhage (ICH)
Subarachnoid hemorrhage (SAH) - with hemiplegia
Subdural hematoma (chronic - gradual onset, elderly, headache, fluctuating consciousness)
Brain tumor (primary glioma or metastasis - gradual progressive, headache, morning vomiting)
Brain abscess (fever + focal deficits + raised ICP)
Demyelinating disease (Multiple sclerosis - young patient, relapsing-remitting)
Todd's palsy (post-ictal paralysis - history of seizure, resolves within 24h)
Hemiplegic migraine (young, family history, headache, reversible)
Hypoglycemia (vital to exclude - reversible)
Cerebral venous sinus thrombosis (CVST) - young, OCP use, puerperium, thrombophilia

PART 9: VIVA QUESTIONS AND ANSWERS

Q1: What is the difference between a TIA and a stroke? A: A TIA (Transient Ischemic Attack) is defined as a transient episode of neurological dysfunction caused by focal brain, spinal cord, or retinal ischemia WITHOUT acute infarction on imaging, typically resolving within 1 hour (older definition was <24h). A stroke is when neurological deficit is permanent or persists >24h with evidence of infarction on imaging. TIA is a medical emergency - risk of stroke within 48-72h is 10-15%, highest risk in ABCD2 score ≥4.

Q2: What is the ABCD2 score? A: Risk stratification tool for stroke after TIA:

Factor	Score
Age ≥60 years	1
BP ≥140/90 at presentation	1
Clinical features: Unilateral weakness / Speech disturbance without weakness	2 / 1
Duration: ≥60 min / 10-59 min	2 / 1
Diabetes	1

Score 0-3: Low risk (2-day stroke risk ~1%); 4-5: Moderate (4%); 6-7: High (8%)

Q3: What is the TOAST classification of ischemic stroke? A: Trial of ORG 10172 in Acute Stroke Treatment (TOAST) classification:

Large artery atherosclerosis (carotid/vertebral stenosis)
Cardioembolism (AF, MI, valvular, PFO)
Small vessel occlusion (lacunar stroke - deep perforators, hypertension, diabetes)
Other determined etiology (dissection, vasculitis, hypercoagulable states, CADASIL)
Undetermined etiology (cryptogenic - accounts for ~25-30%)

Q4: What is the penumbra and why is it important? A: After arterial occlusion, two zones form:

Core: Irreversibly damaged neurons (CBF <10 mL/100g/min) - cannot be saved
Penumbra: Ischemic but still viable tissue (CBF 10-20 mL/100g/min) - can be salvaged if reperfusion occurs within the therapeutic window

The penumbra is electrically silent (not functioning) but not yet dead - this is the target of all reperfusion therapy. Penumbra imaging (PWI-DWI mismatch or CT perfusion) identifies tissue to save with late-window thrombectomy (DAWN/DEFUSE-3 trials extended window to 24 hours).

Q5: What is the significance of Babinski sign? A: Babinski sign (extensor plantar response) indicates an UMN lesion anywhere in the corticospinal tract. It represents release of a primitive reflex (normal in infants up to 18 months) normally suppressed by the descending pyramidal tract. In adults, its presence confirms a lesion in the corticospinal pathway (cortex → internal capsule → brainstem → spinal cord). It is the single most reliable sign of an upper motor neuron lesion.

Q6: Why is upper face spared in a UMN facial palsy? A: The upper facial muscles (frontalis, orbicularis oculi) receive BILATERAL cortical innervation from BOTH hemispheres. Therefore, a unilateral corticospinal lesion (stroke) leaves upper facial muscles with an intact cortical input from the opposite, healthy hemisphere. The lower facial muscles (orbicularis oris, buccinator) receive predominantly CONTRALATERAL cortical input, so they are paralyzed in a contralateral cortical/capsular stroke. Hence, in UMN lesion: lower face weak, upper face spared.

Q7: What is the Fisher grading scale for SAH? A: Based on CT appearance of subarachnoid blood:

Grade	CT Finding	Vasospasm Risk
1	No blood detected	Low
2	Thin diffuse SAH (<1 mm thick)	Low
3	Thick SAH (>1 mm), clot in cisterns	HIGH
4	Intracerebral or intraventricular blood ± SAH	Moderate

Grade 3 has highest risk of delayed cerebral ischemia (vasospasm).

Q8: What is Wallenberg syndrome and what artery is occluded? A: Lateral medullary syndrome (Wallenberg syndrome) is caused by occlusion of the Posterior Inferior Cerebellar Artery (PICA) or the vertebral artery itself. Features include: ipsilateral facial pain/temperature loss, ipsilateral Horner syndrome, ipsilateral cerebellar ataxia, ipsilateral IX/X palsy (dysphagia, dysphonia), contralateral body pain/temperature loss - but NO hemiplegia (pyramids are anterior and spared). The hallmark is crossed sensory loss (ipsilateral face + contralateral body temperature/pain loss).

Q9: What is the mechanism of homonymous hemianopia in stroke? A: Visual pathway after the optic chiasm is entirely ipsilateral. Optic radiation fibers pass through the temporal lobe (lower fibers - Meyer's loop → upper visual field) and parietal lobe (upper fibers → lower visual field) to reach the occipital cortex. Stroke in the posterior limb of internal capsule, optic radiation, or occipital lobe causes loss of the visual field on the OPPOSITE side of both eyes. When the occipital pole (macula representation) is spared (dual blood supply from MCA and PCA), macular sparing occurs - characteristic of PCA territory infarction.

Q10: What is CADASIL? A: Cerebral Autosomal Dominant Arteriopathy with Subcortical Infarcts and Leukoencephalopathy. It is a hereditary small vessel disease caused by mutations in the NOTCH3 gene on chromosome 19. It presents in young adults with recurrent lacunar strokes, early-onset cognitive decline, psychiatric symptoms, and migraine with aura. MRI shows extensive white matter changes (leukoaraiosis) especially in anterior temporal lobes and external capsule. There is no specific treatment.

Q11: What are the differences between ischemic and hemorrhagic stroke clinically?

Feature	Ischemic Stroke	ICH
Onset	Sudden, may be on waking	Sudden, during activity
Headache	Uncommon	Common, severe
Vomiting	Uncommon	Common
Loss of consciousness	Uncommon (unless large/brainstem)	More common
Seizures	Less common	More common
BP	Variable	Usually very high
Progression	Usually maximal at onset or stuttering	May progressively worsen
CT	Normal or hypodense (after 24h)	Hyperdense from start

Q12: What is the mechanism of spasticity after stroke? A: Spasticity develops days to weeks after stroke, after the initial flaccid phase. It results from loss of inhibitory descending pathways (reticulospinal and corticospinal), leading to hyperexcitability of alpha motor neurons and loss of presynaptic inhibition of Ia afferents. Clinically: velocity-dependent increased tone, clasp-knife phenomenon, brisk reflexes, clonus, and Babinski sign. It predominantly affects flexors of the upper limb and extensors of the lower limb (explaining Wernicke-Mann posture).

Q13: What is the National Institutes of Health Stroke Scale (NIHSS)? A: The NIHSS is a standardized neurological assessment tool used to quantify stroke severity. It scores 11 domains:

Level of consciousness (LOC) - 0-3
LOC questions - 0-2
LOC commands - 0-2
Best gaze - 0-2
Visual fields - 0-3
Facial palsy - 0-3
Motor arm (left + right separately) - 0-4 each
Motor leg (left + right separately) - 0-4 each
Limb ataxia - 0-2
Sensory - 0-2
Best language - 0-3
Dysarthria - 0-2
Extinction/inattention - 0-2

Total score: 0-42; 0 = normal; 1-4 = minor; 5-15 = moderate; 16-20 = moderately severe; 21-42 = severe

Q14: What is locked-in syndrome? A: Locked-in syndrome results from bilateral lesion of the ventral pons (basilar artery occlusion), destroying the pyramidal tracts and corticobulbar tracts while sparing the reticular activating system (RAS) and dorsal pons. The patient is fully conscious (RAS intact) but cannot move or speak (bilateral motor paralysis). ONLY vertical eye movements and blinking are preserved (because the vertical gaze center in the midbrain is above the lesion). Communication is possible through eye movement coding.

Q15: What investigations are done in young stroke (< 45 years)? A: Young stroke (cryptogenic) workup:

Cardiac: ECG, Holter, TTE + TOE (PFO, ASD, valvular disease, LA thrombus)
Vascular: CTA/MRA of neck and intracranial vessels (dissection, vasculitis, moyamoya)
Hematological: Thrombophilia screen (Protein C, S, ATIII, Factor V Leiden, Prothrombin mutation, Homocysteine)
Antiphospholipid syndrome: Lupus anticoagulant, anticardiolipin Ab, anti-β2GPI Ab
Inflammatory: ANA, anti-dsDNA, ANCA, ESR, CRP (vasculitis)
Infectious: VDRL, HIV, Lyme disease
Metabolic: Lipid profile, HbA1c, homocysteine
Drug screen: Cocaine, amphetamines
Genetic: NOTCH3 (CADASIL), GLA (Fabry disease), mitochondrial (MELAS)
CSF examination if vasculitis or CNS infection suspected

Q16: What is the stroke unit and why is it important? A: A stroke unit is a dedicated ward with specialized multidisciplinary team (neurologists, nurses trained in stroke, physiotherapists, OT, speech therapists, dieticians, social workers). Evidence from multiple RCTs and meta-analyses shows that stroke unit care reduces mortality by ~20%, dependency by ~22%, and length of stay, regardless of stroke type or severity - independent of thrombolysis. The benefit comes from: early mobilization, aspiration prevention, glucose/BP/temperature management, early rehabilitation, and complication prevention. Admission to stroke unit is the single most effective intervention in acute stroke care.

PART 10: SUMMARY TABLE FOR QUICK REVISION

Topic	Key Point
Most common risk factor	Hypertension
Most common type	Ischemic (85%), Hemorrhagic (15%)
Most common artery	Middle Cerebral Artery (MCA)
First investigation	Non-contrast CT brain
Most sensitive early imaging	MRI DWI
Thrombolysis window	4.5 hours, 0.9 mg/kg Alteplase
Thrombectomy window	24 hours (with penumbra imaging)
Babinski sign	UMN lesion indicator
Upper face spared	UMN lesion (bilateral cortical representation)
Entire face affected	LMN lesion (Bell's palsy)
Eyes deviate toward	Cortical lesion (FEF destroyed - opposite FEF pushes eyes toward lesion side)
Eyes deviate away	Pontine lesion (PPRF destroyed - eyes look away from lesion)
Internal capsule stroke	Pure motor/sensorimotor, NO cortical signs, face+arm+leg equally
Wallenberg	PICA, crossed sensory loss, NO hemiplegia
Weber	CN III + contralateral hemiplegia
Millard-Gubler	CN VI + CN VII + contralateral hemiplegia
ACA territory	Leg > arm weakness
PCA territory	Homonymous hemianopia + macular sparing
Broca aphasia	Non-fluent, comprehension intact, repetition impaired
Wernicke aphasia	Fluent (jargon), comprehension impaired, repetition impaired
Macular sparing	PCA infarct (dual blood supply to macula)
CEA indication	Symptomatic stenosis >70% within 2 weeks
Cardioembolic stroke	Anticoagulate, not antiplatelet
Lacunar stroke	Pure motor / pure sensory / ataxic hemiparesis / dysarthria-clumsy hand

All content is based on Adams and Victor's Principles of Neurology 12th Ed, Bradley and Daroff's Neurology in Clinical Practice, Harrison's Internal Medicine 22E, and standard MMC clinical examination guidelines. Good luck with your long case!

MS ,MR, AS, AR,- CVS short cases

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Excellent - I have detailed textbook content from Braunwald's Heart Disease. Now I'll compile the complete guide.

CVS SHORT CASES - Complete Guide

Mitral Stenosis (MS) | Mitral Regurgitation (MR) | Aortic Stenosis (AS) | Aortic Regurgitation (AR)

Medicine Practical Examination - Madras Medical College

HOW TO PRESENT A CVS SHORT CASE (Universal Format)

Opening line: "On examination of the cardiovascular system, this patient has a [rate] pulse of [volume/character], blood pressure of [BP mmHg]. The apex beat is located at [position] and is [character]. On auscultation, [findings]. The diagnosis is [condition]."

SECTION 1: MITRAL STENOSIS (MS)

General Physical Examination Findings in MS

Finding	Description	Reason
Malar flush (Mitral facies)	Bilateral pinkish-purple discoloration of cheeks	Low cardiac output → peripheral vasoconstriction; cyanosis from right heart failure
Pulse	Small volume, irregularly irregular (AF in severe MS)	Reduced stroke volume; AF from LA enlargement
BP	Normal or low	Reduced cardiac output
JVP	Raised if right heart failure	Pulmonary hypertension → RV failure
Peripheral cyanosis	Lips, fingertips	Reduced cardiac output
Clubbing	Absent (not a feature of MS)	-
Signs of RHF	Pitting edema, hepatomegaly	Pulmonary hypertension → RV failure

Cardiac Examination

Inspection

No visible cardiac impulse usually (small heart)
May see right ventricular heave at lower sternal border (pulmonary hypertension)

Palpation

Sign	Description	Significance
Tapping apex beat	Palpable S1 - feels like a tap rather than a sustained heave	Pliable, mobile mitral valve closing forcefully (loud S1)
Apex position	Usually NOT displaced (LA enlarges posteriorly)	LA enlargement does not displace apex
Left parasternal heave	Sustained thrust at left sternal border	RV hypertrophy (pulmonary hypertension)
Palpable P2	Second heart sound palpable at pulmonary area	Pulmonary hypertension
Diastolic thrill	Low-frequency vibration at apex (in severe MS)	Thrill of the murmur - rare

Percussion

Upper border of cardiac dullness raised to 2nd ICS (LA enlargement extending upward)
Increased cardiac dullness to the right (LA bulge)

Auscultation - THE MOST IMPORTANT PART

Position the patient: Left lateral decubitus (turns heart toward chest wall - amplifies apex murmur); use the BELL of stethoscope lightly applied at apex

Sound	Description	Reason
Loud S1	Loud, snapping first heart sound at apex	Mitral leaflets held open by high LA pressure; snap shut forcefully and late at onset of systole (pliable valve)
Opening Snap (OS)	High-pitched sound after A2, heard at left sternal border to apex	Sudden opening of stenotic but pliable leaflets under high LA pressure
A2-OS interval	Time between A2 and OS	Inversely proportional to severity - shorter interval = higher LA pressure = MORE severe MS
Mid-diastolic murmur (MDM)	Low-pitched rumbling, starts after OS, at apex	Blood flowing through narrow mitral valve; heard with BELL, left lateral position
Presystolic accentuation (PSA)	Crescendo just before S1	Atrial contraction (sinus rhythm) forces blood through narrow valve; ABSENT in AF
Loud P2	Accentuated pulmonary component of S2	Pulmonary hypertension

Characteristics of MS murmur:

Timing: Mid-diastolic (after OS) + presystolic accentuation (before S1)
Character: Low-pitched, rumbling
Site: Apex
Radiation: Minimal (does not radiate)
Best heard: Bell, left lateral position, after mild exercise
Length of murmur correlates with severity (intensity does NOT)

Important maneuvers:

Left lateral position: Amplifies murmur
Mild exercise (sit-ups/walking): Increases heart rate and cardiac output - murmur becomes louder
Held expiration: Reduces right heart sounds, accentuates left-sided sounds

Investigations for MS

Investigation	Findings
ECG	P mitrale (bifid P wave in lead II, biphasic P in V1) - LA enlargement; AF in established disease; RVH (right axis deviation, tall R in V1)
Chest X-ray	Straight left heart border (LA appendage enlargement), double contour of right heart border (LA behind RA), upper lobe venous diversion, Kerley B lines (horizontal lines at lung base = lymphatic congestion), mitral valve calcification, enlarged pulmonary artery
Echocardiography (Gold standard)	Commissural fusion, "hockey-stick" appearance of anterior mitral leaflet (doming), mitral valve area (MVA) by planimetry or pressure half-time, LA enlargement, pulmonary artery pressure
Cardiac catheterization	Transmitral gradient, pulmonary artery pressure (done when echo inconclusive)

Echo Severity Grading of MS:

Severity	MVA (cm²)	Mean Gradient (mmHg)
Mild	>1.5	<5
Moderate	1.0-1.5	5-10
Severe	<1.0	>10

Wilkins Echo Score (for BMV suitability - score ≤8 = favorable):

Feature	Score 1	Score 2	Score 3	Score 4
Mobility	Highly mobile	Reduced mid/basal	Base only mobile	None
Thickening	Near normal (4-5mm)	5-8mm	8-10mm	>10mm
Calcification	Single area	Scattered margins	Mid-leaflet dense	Extensive
Subvalvular	Minimal	1/3 chordal length	Distal 1/3	Extensive

Management of MS

Medical

Rate control (for AF): Beta-blockers (metoprolol), digoxin, calcium channel blockers (diltiazem)
Anticoagulation (AF + MS): Warfarin (INR 2-3); DOACs NOT recommended in MS + AF (INVICTUS trial)
Diuretics: Furosemide for pulmonary congestion
Penicillin prophylaxis: Secondary prevention of rheumatic fever - Benzathine penicillin 1.2 MU IM every 3-4 weeks (until age 40 in India)
No inotropes - may worsen outcome

Interventional / Surgical

Procedure	Indication	Contraindication
Balloon Mitral Valvotomy (BMV / PTMC)	Symptomatic severe MS (MVA ≤1.5 cm²) + favorable anatomy (Wilkins score ≤8) + no MR >2+, no LA thrombus	Significant MR (>2+), LA thrombus, unfavorable echo score
Open Mitral Commissurotomy (OMC)	Favorable anatomy but failed BMV or not available	-
Mitral Valve Replacement (MVR)	Unfavorable anatomy, severe subvalvular disease, significant MR + MS	-

Viva Questions - MS

Q: Why is S1 loud in MS? A: In MS, the mitral leaflets are held apart (kept open) throughout diastole by the elevated LA pressure. At the start of systole, the leaflets have a long excursion to travel to close, gaining momentum, and snap shut forcefully and relatively late - producing a loud S1. As the valve calcifies and becomes rigid, S1 becomes soft again.

Q: What does the A2-OS interval tell you? A: It is inversely proportional to the severity of MS. A shorter A2-OS interval (<70 ms) = more severe MS, because a higher LA pressure opens the valve sooner after A2. A longer interval = milder MS.

Q: Why is presystolic accentuation absent in AF? A: Presystolic accentuation is produced by atrial contraction (active atrial emptying) forcing blood through the narrow valve just before systole. In AF, there is no organized atrial contraction, so this component disappears.

Q: What is Ortner's syndrome? A: Hoarseness of voice due to compression of the left recurrent laryngeal nerve by the massively enlarged left atrium (or enlarged pulmonary artery). It is a rare complication of severe MS.

Q: Why does MS not cause LV enlargement? A: In MS, the obstruction is at the mitral valve - the LV receives less blood (reduced preload). The LV may actually be small/normal or may underperform. Enlargement occurs in the LA (volume + pressure overload upstream), not the LV.

SECTION 2: MITRAL REGURGITATION (MR)

General Physical Examination

Finding	Description	Reason
Pulse	Regular or irregularly irregular (AF in chronic MR)	AF from LA enlargement
Volume	Normal initially; small in severe decompensated MR
JVP	Raised if RHF develops
BP	Normal	Regurgitation back into LA
Signs of LHF	Basal crepitations	Pulmonary venous congestion

Cardiac Examination

Palpation

Sign	Description	Reason
Apex beat - displaced	Down and out (6th ICS, anterior axillary line)	LV dilatation (volume overload)
Apex character	Hyperdynamic/thrusting/forceful	LV volume overload (dilated, hyperkinetic)
Left parasternal heave	Systolic heave at left sternal border	LA expanding posteriorly pushes RV forward; OR pulmonary hypertension
Systolic thrill	At apex (severe MR)	Thrill of regurgitant jet

Auscultation

Sound	Description	Reason
S1	SOFT or absent	Incomplete mitral valve closure; valve fails to close fully
Pansystolic (holosystolic) murmur	Starts with S1, occupies entire systole to S2	Blood regurgitates from LV to LA throughout systole; LV > LA pressure all of systole
S3 gallop	Third heart sound at apex	Rapid ventricular filling in early diastole (LA blood + regurgitant volume flowing back) - indicates significant MR with LV dysfunction
Mid-diastolic flow murmur	Short, soft MDM at apex after S3	Increased flow across normal mitral valve (hyperdynamic flow murmur - NOT MS)
Loud P2	If pulmonary hypertension develops	Chronic pulmonary hypertension

Characteristics of MR murmur:

Timing: Pansystolic (holosystolic) - throughout systole
Character: High-pitched, blowing
Site: Apex (mitral area - 5th ICS, MCL)
Radiation: To left axilla (sometimes to left subscapular area / back)
Intensity: Grade 3-4/6 typically
Increases with: Squatting, leg raising, isometric exercise (increased preload/afterload)
Decreases with: Standing, Valsalva (decreased preload)

Important distinctions:

Acute MR (ruptured chordae, papillary muscle rupture post-MI): Murmur may be SHORT or even absent (LA not dilated, acutely high pressures equilibrate)
Functional MR (dilated CM): Due to annular dilatation and papillary muscle displacement

Investigations for MR

Investigation	Findings
ECG	P mitrale (LA enlargement), LVH (tall R in V5-V6, deep S in V1), AF in chronic MR
Chest X-ray	Cardiomegaly (LV + LA enlargement), double shadow right heart border (LA), upper lobe diversion, pulmonary congestion, mitral valve calcification (rheumatic)
Echocardiography	Color Doppler shows regurgitant jet into LA; LVEF (normal >60%, <60% = impaired in MR), LV dimensions, EROA (effective regurgitant orifice area), regurgitant volume, LA size

Echo Severity (AHA/ACC):

Severity	EROA (cm²)	Regurgitant Volume (mL/beat)
Mild	<0.20	<30
Moderate	0.20-0.39	30-59
Severe	≥0.40	≥60

Management of MR

Medical

Vasodilators (acute severe MR): Sodium nitroprusside, IV diuretics
ACE inhibitors/ARBs: For symptomatic MR with LV dysfunction
Beta-blockers: If LV dysfunction / AF rate control
Diuretics: For congestion
Anticoagulation: If AF present

Surgical Indications (AHA 2021):

Indication	Class
Symptomatic severe MR + LVEF >30%	Class I
Asymptomatic severe MR + LVEF 30-60% OR LVESD >40mm	Class I
Asymptomatic severe MR, repair likely, LVEF >60%, LVESD <40mm (experienced center)	Class IIa

Preferred: Mitral valve repair over replacement (better outcomes, no need for lifelong anticoagulation, preserves LV function) Replacement: If repair not feasible

Transcatheter options:

MitraClip (TEER - Transcatheter Edge-to-Edge Repair): For high surgical risk patients

Viva Questions - MR

Q: Why is S1 soft in MR? A: The mitral leaflets fail to coapt fully (incomplete closure) so they have minimal excursion to close - producing a soft S1. The murmur begins at S1 (replacing it in intensity).

Q: Why does MR cause LV dilatation? A: In MR, blood is ejected into both the aorta (forward) AND the LA (backward) during systole. The LA/pulmonary veins return this extra regurgitant volume to the LV in diastole → chronic volume overload → LV eccentric hypertrophy and dilatation (Frank-Starling mechanism maintaining output until decompensation).

Q: What is the significance of S3 in MR? A: S3 (third heart sound) in MR does NOT necessarily indicate heart failure (unlike in IHD). It represents the rush of large volumes of blood (normal LV filling + regurgitant volume from LA) into the LV in early diastole. However, if LVEF is reduced, S3 does indicate LV dysfunction. In severe MR with preserved LVEF, S3 is a normal finding.

Q: What is functional MR? A: Functional (secondary) MR occurs with a structurally normal valve. In dilated cardiomyopathy, the LV dilates → papillary muscles displaced laterally → mitral valve leaflets tethered (restricted closure) + mitral annular dilatation → central regurgitant jet. Treatment targets the underlying LV disease, not the valve per se.

SECTION 3: AORTIC STENOSIS (AS)

General Physical Examination

Finding	Description	Reason
Pulse	Pulsus parvus et tardus - small volume, slow-rising	Fixed obstruction limits aortic outflow; peak delayed and reduced
Anacrotic pulse	Notch on upstroke palpated at carotid	Vibration of obstruction felt on ascending limb
Pulse rate	Regular usually	-
BP	Narrow pulse pressure	Reduced systolic due to fixed outflow; diastolic maintained
Carotid thrill	Palpable thrill in neck	Transmitted murmur
Syncope, angina, dyspnea	Ominous symptoms - mean survival 3, 5, 2 years respectively	Classic triad

Cardiac Examination

Palpation

Sign	Description	Reason
Apex beat	NOT displaced initially; sustained/heaving	LV concentric hypertrophy (pressure overload); increased LV mass but not dilated until late
Apex displacement	Late - when decompensated (dilated)	LV dilatation occurs late in AS
Systolic thrill	At aortic area (2nd ICS right) AND along carotid	Transmitted from high-velocity jet through stenotic valve
Left ventricular heave	Sustained, forceful, not displaced	Concentric LVH

Auscultation

Sound	Description	Reason
S1	Normal	Mitral valve unaffected
S2 (A2)	Soft or absent A2	Calcified, immobile aortic valve leaflets - cannot close rapidly/loudly
Reversed splitting of S2	In severe AS (A2 delayed)	LV outflow prolonged → A2 comes after P2 (normally A2 before P2); on expiration the split becomes apparent
S4 gallop	Before S1, at apex	LV hypertrophy → non-compliant LV → forceful atrial contraction; almost universal in severe AS
Ejection click	After S1, at base	In congenital/bicuspid AS (pliable valve); ABSENT in calcific senile AS (rigid leaflets)
Ejection systolic murmur (ESM)	Diamond/crescendo-decrescendo systolic murmur	Blood ejected through stenotic aortic valve in a high-velocity jet

Characteristics of AS murmur:

Timing: Ejection systolic (starts AFTER S1 with an ejection click; crescendo-decrescendo; ends before S2)
Character: Harsh, rough, rasping; medium-high pitched
Grade: Variable (Grade 3-5); INTENSITY CORRELATES POORLY with severity in decompensated/low-flow state
Site: Aortic area (2nd ICS, right sternal border)
Radiation: To carotid arteries (most important) and along right clavicle; also toward the apex (Gallavardin phenomenon)
Gallavardin phenomenon: In elderly calcific AS, the murmur at the apex has a musical/cooing quality distinct from the harsh sound at the base; can be mistaken for MR

Gallavardin phenomenon explained:

High-frequency components of AS murmur radiate to apex and sound musical/cooing there
Distinguished from MR by: musical quality, lacks radiation to axilla, diminishes with Valsalva

Investigations for AS

Investigation	Findings
ECG	LVH (tall R in V5-V6 + S in V1 ≥35mm; strain pattern: ST depression + T inversion in lateral leads V4-V6); Left axis deviation; LBBB (late)
Chest X-ray	Post-stenotic dilatation of ascending aorta (prominent right upper mediastinum), calcification of aortic valve (on lateral CXR), NOT cardiomegaly until decompensated, boot-shaped heart (concentric LVH)
Echocardiography	Thickened, calcified aortic valve leaflets, restricted opening, transvalvular gradient, aortic valve area (AVA) by continuity equation, LVEF
Cardiac catheterization	Simultaneous LV and aortic pressure measurement - transvalvular gradient

Severity of AS (AHA/ACC):

Parameter	Mild	Moderate	Severe	Very Severe
Peak jet velocity (m/s)	2.0-2.9	3.0-3.9	≥4.0	≥5.0
Mean gradient (mmHg)	<20	20-39	≥40	≥60
AVA (cm²)	>1.5	1.0-1.5	<1.0	<0.6
AVA indexed	>0.85	0.60-0.85	<0.60	-

Symptomatic Triad of AS and Prognosis:

Symptom	Mean Survival Without Surgery
Angina	~5 years
Syncope	~3 years
Heart failure (dyspnea)	~2 years

"SAD" mnemonic: Syncope → Angina → Dyspnea = progressively worse prognosis

Management of AS

Medical

No specific medical therapy that modifies progression
Statin trials (SEAS, SALTIRE) failed to show benefit in slowing calcification
Treat comorbidities: HTN (avoid vasodilators/diuretics which reduce preload), avoid tachycardia
Digoxin/diuretics for heart failure symptoms (cautiously)
AVOID: Nitrates, ACE inhibitors (may cause dangerous hypotension), vigorous exercise

Surgical / Interventional

Procedure	Indication	Notes
Surgical AVR (SAVR)	Symptomatic severe AS in good surgical candidate	Gold standard; tissue (bioprosthetic) preferred >65 years; mechanical <65 years
TAVI/TAVR (Transcatheter Aortic Valve Implantation/Replacement)	High/extreme surgical risk; increasingly used in intermediate/low risk	Via femoral artery; PARTNER trials; now approved for all risk groups
Balloon Aortic Valvuloplasty (BAV)	Bridge to TAVI in hemodynamically unstable patient; palliative	Restenosis common - NOT definitive

Viva Questions - AS

Q: What is pulsus parvus et tardus? How do you elicit it? A: Pulsus parvus = small volume pulse; pulsus tardus = slow rising pulse (delayed upstroke). In AS, the fixed obstruction limits stroke volume and delays peak aortic flow. Best felt at the carotid artery (central pulse, less modified by peripheral factors than radial). The upstroke is prolonged, the peak is late, and the volume is reduced. An anacrotic notch (shoulder on the upstroke) may be palpable in some patients.

Q: Why is the apex beat sustained but NOT displaced in early AS? A: AS causes pressure overload of the LV → LV responds with concentric hypertrophy (increased wall thickness WITHOUT chamber enlargement). The increased muscle mass makes the apex forceful/sustained (hyperdynamic) but the cavity is small, so it doesn't displace laterally/inferiorly. Only when the LV decompensates and dilates does the apex become displaced.

Q: What is the Gallavardin phenomenon? A: In elderly patients with calcific AS, the harsh medium-pitched component of the murmur transmits to the aortic area, while the high-frequency musical components travel preferentially to the apex, sounding like MR (musical, "cooing" or "seagull" quality). The two zones of maximum intensity (aortic area = harsh, apex = musical) can be confused for two separate lesions (AS + MR). The apex component is softer, disappears in the aortic area, and lacks axillary radiation.

Q: Why does syncope occur in AS? A: Exercise-induced syncope in AS: During exercise, peripheral vasodilation occurs normally. With fixed cardiac output (stenotic valve cannot increase stroke volume), this causes a fall in systemic vascular resistance without compensatory increase in CO → fall in cerebral perfusion → syncope. Additionally, baroreceptors in the LV may trigger a vagal response (Bezold-Jarisch reflex) due to high intraventricular pressure → inappropriate vasodilation → syncope.

SECTION 4: AORTIC REGURGITATION (AR)

General Physical Examination - MOST SIGNS-RICH VALVE LESION

Peripheral Signs of AR (Eponymous Signs - Essential for Exam)

Sign	Description	Eponym
Collapsing/Water-hammer pulse	Rapid forceful upstroke, sudden collapse; slapping sensation when arm raised	Corrigan's pulse (Irish physician Dominic Corrigan)
Visible carotid pulsation	Prominent pulsation in neck ("dancing carotids")	Corrigan's sign
Head nodding with pulse	Head bobs with each heartbeat	De Musset's sign (French poet Alfred de Musset - had syphilitic AR)
Uvula pulsation	Uvula bobs synchronously with heart beat	Müller's sign
Capillary pulsation	Visible capillary pulsations in fingernail bed (press tip gently)	Quincke's sign
Femoral pistol shots	Loud pistol-shot sound on auscultating femoral artery	Traube's sign
To-and-fro femoral murmur	Systolic and diastolic murmur on compressing femoral artery	Duroziez's sign (most specific for hemodynamically significant AR)
Wide pulse pressure	e.g., 160/40 mmHg	Due to high stroke volume (systolic) + peripheral runoff (diastolic)
Hill's sign	Popliteal artery BP exceeds brachial by >20 mmHg (>60 mmHg = severe)	Normal <20 mmHg difference; AR causes exaggerated lower limb pressure
Lighthouse sign	Alternate flushing and paling of face with heartbeat	-
Landolfi's sign	Alternating constriction and dilation of pupil	-
Becker's sign	Visible pulsation of retinal arteries on fundoscopy	-
Rosenbach's sign	Systolic pulsation of liver	-
Lincoln sign	Pulsation of popliteal artery	-

How to demonstrate Quincke's sign: Gently compress nail bed at tip of finger - a rhythmic pallor and flush alternates at the nail bed edge, visible as a pulsatile pink/white border.

Cardiac Examination

Inspection

Precordial prominence (if congenital, chronic AR since childhood)
Visible apex pulsation (hyperdynamic LV)

Palpation

Sign	Description	Reason
Apex beat - displaced	Down and out (6th-7th ICS, beyond MCL or anterior axillary line)	LV eccentric hypertrophy and dilatation (volume overload)
Apex character	Hyperdynamic, thrusting, forceful ("collapsing" character)	Increased stroke volume + rapid emptying
Diastolic thrill	Left sternal border (left lateral position, sitting forward)	Thrill of regurgitant jet

Auscultation

Patient position: Sitting forward, breath held in expiration (brings heart closer to chest wall, amplifies AR murmur)

Sound	Description	Reason
S1	Normal or soft	Mitral valve partially closed by elevated LVEDP
A2	Soft	Aortic valve leaflets cannot close properly
S3	Present in moderate-severe AR	Volume overload rapid filling; indicates LV dysfunction if symptomatic
Early diastolic murmur (EDM)	Starts immediately at A2, decrescendo through diastole	Blood regurgitating from aorta to LV the moment LV pressure falls below aortic in diastole
Austin Flint murmur	Mid-diastolic/presystolic rumble at apex	Regurgitant jet hitting anterior mitral leaflet, pushing it up and functionally narrowing mitral orifice; OR mixing of regurgitant jet with antegrade mitral flow causing turbulence; mimics MS (no OS, no loud S1)

Characteristics of AR murmur:

Timing: Early diastolic (starts at A2, goes toward S1 - decrescendo)
Character: High-pitched, blowing, "hissing" or "windstorm" quality
Site: Left sternal border, 3rd-4th ICS (Erb's point)
Best heard: Patient sitting forward, breath held in expiration
Radiation: Toward the apex
Also: Systolic flow murmur (ejection) at aortic area due to increased stroke volume (does NOT mean AS)

Investigations for AR

Investigation	Findings
ECG	LVH (deep Q in I, V5, V6 - "diastolic overload pattern"), tall R in V5-V6, strain pattern later; left axis deviation
Chest X-ray	Cardiomegaly (LV enlargement - prominent left heart border going down and out), "Aortic" configuration of heart, dilated ascending aorta (especially in aortic root disease - Marfan, syphilitic aortitis), increased pulsatility of aortic knuckle
Echocardiography	Diastolic fluttering of anterior mitral leaflet (Austin Flint - specific sign on M-mode), LV dimensions (LVEDD, LVESD), LVEF, regurgitant fraction, regurgitant jet width/EROA, aortic root size

Austin Flint on Echo (M-mode):

Fine diastolic flutter of the anterior mitral leaflet due to the regurgitant jet causing vibration.

Severity of AR:

Parameter	Mild	Moderate	Severe
Jet width/LVOT width	<25%	25-64%	≥65%
Regurgitant volume (mL)	<30	30-59	≥60
Regurgitant fraction (%)	<30	30-49	≥50
EROA (cm²)	<0.10	0.10-0.29	≥0.30

Indicators of Surgery in Chronic AR:

LVEDD >65 mm
LVESD >50 mm (or >25 mm/m²)
LVEF <50%
Symptomatic patient with severe AR

Management of AR

Medical

Vasodilators: ACE inhibitors, nifedipine, ARBs - REDUCE afterload and regurgitant volume; delay surgery in asymptomatic patients with LV dilatation
Diuretics: Pulmonary congestion
Treat underlying cause: Syphilis (penicillin), infective endocarditis (antibiotics), aortitis

Surgical

Procedure	Indication
Aortic Valve Replacement (AVR)	Symptomatic severe AR; Asymptomatic severe AR + LVEF <50% or LVEDD >65mm/LVESD >50mm
Aortic root repair/replacement (Bentall procedure)	AR due to aortic root disease/aneurysm (Marfan, bicuspid)

Note: Unlike AS, TAVI is not standard for AR (difficult to deploy, no calcium for anchoring).

Viva Questions - AR

Q: What are the causes of AR?

Valve Leaflet Disease	Aortic Root Disease
Rheumatic fever (most common in India)	Marfan syndrome (cystic medial necrosis)
Infective endocarditis	Syphilitic aortitis (tertiary syphilis)
Bicuspid aortic valve	Hypertension
Rheumatoid arthritis	Ankylosing spondylitis (aortitis)
SLE (Libman-Sacks endocarditis)	Aortic dissection
Trauma	Ehlers-Danlos syndrome

Q: Why is the pulse pressure wide in AR? A: During systole, the LV ejects an increased stroke volume (normal + regurgitant volume) into the aorta → systolic pressure is HIGH. During diastole, blood rapidly runs off back through the incompetent valve into the LV (peripheral runoff) + into the periphery → diastolic pressure is LOW. Result: Wide pulse pressure (e.g., 160/40 mmHg). Pulse pressure >50% of systolic pressure suggests significant AR.

Q: What is Austin Flint murmur and how do you differentiate it from MS? A: Austin Flint murmur is a mid-diastolic (sometimes presystolic) rumble at the apex, produced in severe AR by: (1) the regurgitant jet striking the anterior mitral leaflet, causing it to vibrate (flutter) and functionally narrow the mitral orifice, (2) increased LVEDP raising the effective pressure against which the mitral valve opens.

Feature	Austin Flint	MS
Opening snap	Absent	Present
S1	Soft	Loud
Presystolic accentuation	May be present	Present (in SR)
Other AR signs	Present (collapsing pulse, etc.)	Absent
Malar flush	Absent	Present
S3	May be present	Absent (its presence excludes severe MS)

Q: What is Duroziez's sign and what does it indicate? A: Apply gentle pressure with stethoscope over the femoral artery in the groin. In AR, you hear a systolic bruit proximally AND a diastolic bruit distally (to-and-fro murmur). It is one of the most specific signs for hemodynamically significant AR. It is caused by to-and-fro blood flow due to the wide pulse pressure.

Q: What is Hill's sign? A: Hill's sign is the exaggerated systolic blood pressure difference between the popliteal artery (leg) and brachial artery (arm). Normally: popliteal SBP is 20 mmHg higher than brachial. In AR: difference is >20 mmHg (moderate: 20-40 mmHg; severe: >60 mmHg). The mechanism is peripheral amplification of the large stroke volume traveling to larger vessels.

MASTER COMPARISON TABLE - ALL 4 VALVULAR LESIONS

Feature	MS	MR	AS	AR
Murmur timing	Mid-diastolic	Pansystolic	Ejection systolic	Early diastolic
Murmur character	Low-pitched rumble	High-pitched, blowing	Harsh, crescendo-decrescendo	High-pitched, blowing, decrescendo
Site	Apex	Apex	Aortic area (2nd ICS R)	Left sternal border (3rd-4th ICS)
Radiation	None	Left axilla	Carotid arteries	Apex
Best heard	Bell, left lateral	Diaphragm, apex	Diaphragm, sitting upright	Sitting forward, expiration, diaphragm
S1	Loud (tapping)	Soft/absent	Normal	Normal/soft
S2	Loud P2 (pulm. HTN)	Loud P2	Soft A2 (calcific)	Soft A2
Added sounds	Opening snap (OS)	S3	Ejection click (bicuspid), S4	S3, Austin Flint murmur
Apex beat	Tapping, not displaced	Hyperdynamic, displaced	Sustained, NOT displaced (early)	Hyperdynamic, displaced down+out
Pulse	Small volume ± AF	Normal or AF	Pulsus parvus et tardus	Collapsing/water-hammer
BP	Normal/low	Normal	Narrow pulse pressure	Wide pulse pressure
Left atrium	Enlarged	Enlarged	Normal	Normal (or mildly enlarged)
Left ventricle	Small/normal	Dilated (volume)	Hypertrophied (concentric, pressure)	Dilated (eccentric, volume)
X-ray	Double R heart border, straight L border	Cardiomegaly	Post-stenotic aortic dilatation	Cardiomegaly + dilated aorta
ECG	P mitrale, RVH, AF	LVH + P mitrale	LVH + strain	LVH (diastolic overload)
Most common cause (India)	Rheumatic fever	Rheumatic fever	Calcific (elderly), Bicuspid (young)	Rheumatic fever / aortic root disease
Intervention	BMV (PTMC) / MVR	Repair > Replace	SAVR / TAVI	AVR
Medical Rx	Rate control, anticoag, penicillin prophylaxis	ACE-I, diuretics	AVOID vasodilators	ACE-I/nifedipine (delay surgery)

SPECIAL TOPICS FOR VIVA

Endocarditis Prophylaxis (AHA 2021 - Updated Guidelines)

Recommended only for:

Prosthetic cardiac valves (mechanical or bioprosthetic)
Previous infective endocarditis
Congenital heart disease (unrepaired or with residual defects after repair, or within 6 months of repair)
Cardiac transplant recipients with valvulopathy

NOT recommended for acquired valvular disease (MS, MR, AS, AR) without above conditions

Regimen: Amoxicillin 2g PO 30-60 minutes before dental/invasive procedure (or Ampicillin 2g IV if unable to take orally; Clindamycin/Azithromycin if penicillin allergic)

Dynamic Auscultation - Murmur Changes

Maneuver	Preload	Afterload	MS	MR	AS	AR
Standing	↓	-	Softer	Softer	Softer	Softer
Squatting	↑	↑	Louder	Louder	Louder	Louder
Valsalva (strain phase)	↓	↑	Softer	Softer	Softer	Softer
Inspiration	↑	-	No change	No change	No change	No change
Exercise (mild)	↑	-	LOUDER	Louder	Louder	Louder
Isometric grip	-	↑	No change	Louder	Softer	Louder

Rheumatic Heart Disease (Cause of MS, MR, combined lesions in India)

Jones Criteria (2015 AHA revision) for Acute Rheumatic Fever:

Major criteria (JONES):

J - Joints (Migratory polyarthritis - most common)
O - (Carditis - pancarditis, most dangerous - most common cause of death)
N - Nodules (Subcutaneous nodules - over bony prominences)
E - Erythema marginatum (skin rash - trunk, spares face)
S - Sydenham's chorea (neurological - involuntary purposeless movements)

Minor criteria: Fever >38.5°C, Elevated ESR/CRP, Prolonged PR interval, Arthralgia (if arthritis not used as major)

Evidence of preceding Streptococcal infection: Positive throat culture / Rapid strep test / Rising ASO titer (most important)

Diagnosis: 2 Major OR 1 Major + 2 Minor + evidence of preceding Strep infection

Most common valvular lesion: MS (in chronic RHD - from repeated attacks → progressive mitral leaflet thickening, commissural fusion, subvalvular disease)

All content based on Braunwald's Heart Disease 12th Ed, Harrison's Internal Medicine 22E, Fuster and Hurst's The Heart 15th Ed, and AHA/ACC 2021 Valvular Heart Disease Guidelines.

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