I now have sufficient information from the textbooks. Let me compile all the answers comprehensively.Here are complete model answers for the entire exam paper from SAMC & PGI Indore - 2nd Sessional Exam, July 2026.
DEPARTMENT OF SURGERY - SAMC & PGI INDORE
2nd Sessional Exam 2021 (July 2026) - Model Answers
LONG QUESTIONS (Any 2) [2 x 15 = 30]
Q1. Enumerate Etiologies of Perforation Peritonitis. Discuss Clinical Features & Management of Peptic Perforation.
Etiologies of Perforation Peritonitis
| System | Causes |
|---|
| Peptic/gastroduodenal | Peptic ulcer perforation (most common in adults), stress ulcers |
| Small bowel | Typhoid perforation, Meckel's diverticulum, Crohn's disease, trauma |
| Large bowel | Diverticular disease, carcinoma colon, toxic megacolon, volvulus |
| Appendix | Perforated appendicitis |
| Biliary | Perforated cholecystitis, bile duct injury |
| Gynecological | Ectopic pregnancy rupture, tubo-ovarian abscess |
| Iatrogenic | Post-colonoscopy, post-surgery anastomotic leak |
| Others | Foreign body perforation, ischemic bowel |
Peptic Ulcer Perforation
Pathophysiology: Acid-pepsin erosion breaches the full thickness of the gastroduodenal wall (duodenal > gastric), allowing gastric contents to spill into the peritoneum. The most common site is the anterior wall of the first part of the duodenum (60%).
Clinical Features:
Symptoms:
- Sudden onset, severe, constant "board-like" epigastric pain - the pain is instantaneous and catastrophic
- Pain may radiate to right shoulder (referred diaphragmatic irritation)
- Nausea and vomiting
- History of peptic ulcer disease in ~50% of patients
Signs (3 stages):
- Peritoneal shock (0-2 hrs): Severe epigastric pain, board-like rigidity, absent bowel sounds, patient lies still
- Reaction stage (2-12 hrs): Temporary improvement (gut bacteria haven't infected yet), patient appears slightly better - can be misleading
- Bacterial peritonitis (>12 hrs): Fever, sepsis, distension, toxemia, paralytic ileus
Key signs:
- Board-like abdominal rigidity
- Guarding and tenderness
- Loss of liver dullness on percussion (Traube's space - free gas under diaphragm)
- Obliteration of psoas shadow on X-ray
Investigations:
- X-ray erect abdomen: Free gas under diaphragm in 70-80% (pneumoperitoneum)
- CT abdomen (gold standard): Free air, fluid collection, perforation site
- Serum amylase (may be mildly raised)
- FBC, LFTs, urea/creatinine
Management:
Resuscitation (immediate):
- IV access, aggressive fluid resuscitation (crystalloids)
- Nasogastric tube on free drainage (decompress stomach)
- Urinary catheter to monitor output
- IV broad-spectrum antibiotics (e.g., cefuroxime + metronidazole)
- Analgesia (IV opioids)
- NBM, PPI (proton pump inhibitor) IV infusion
Surgical Management:
Gold standard: Simple Closure (Omentopexy / Graham's patch repair)
- Laparoscopic or open
- The perforation is closed with 2-3 absorbable sutures + a pedicle of omentum tied over the defect (Graham's patch)
- Peritoneal lavage with warm saline
Definitive ulcer surgery: Now rarely performed. H. pylori eradication post-op is key.
Post-operative:
- Continue antibiotics
- H. pylori testing and eradication (triple therapy: PPI + clarithromycin + amoxicillin x 7 days)
- Long-term PPI
- Avoid NSAIDs, smoking, alcohol
Q2. Describe with Schematic Diagram: Anatomy of Venous System of Lower Limb. Discuss Etiopathogenesis & Management of Venous Ulcer.
Anatomy of Venous System of Lower Limb
Three systems:
1. Superficial System:
- Great Saphenous Vein (GSV): Longest vein in body. Arises from medial end of dorsal venous arch, ascends anteromedially to enter femoral vein at saphenofemoral junction (SFJ) - 4 cm below and lateral to pubic tubercle. It has 6 tributaries entering at the SFJ ("the six sisters").
- Small Saphenous Vein (SSV): Arises from lateral dorsal arch, runs posterolateral up the calf, enters popliteal vein at saphenopopliteal junction (SPJ) in popliteal fossa.
2. Deep System:
- Runs alongside named arteries: Anterior tibial, posterior tibial, peroneal veins → popliteal vein → femoral vein → external iliac vein
3. Perforating (Communicating) Veins:
- Connect superficial to deep at 3 levels: ankle (Cockett's perforators), mid-calf (Boyd's), thigh (Dodd's/Hunterian)
- Normal flow is from superficial → deep
- Valves prevent reflux from deep → superficial
Schematic:
External iliac vein
|
Femoral vein ←── GSV (SFJ)
|
Popliteal vein ←── SSV (SPJ)
|
Anterior/Posterior tibial
and Peroneal veins
|
Plantar venous plexus
Etiopathogenesis of Venous Ulcer
Venous disease causes ~85% of all chronic lower limb ulcers.
Primary mechanism: Sustained venous hypertension due to:
- Valvular incompetence (superficial or deep)
- Deep vein obstruction (post-thrombotic syndrome)
- Perforator incompetence (reflux from deep to superficial)
Sequence:
- Incompetent valves → venous reflux → ambulatory venous hypertension
- Increased venous pressure transmitted to capillaries
- Capillary leak of fibrin and proteins → pericapillary fibrin cuffs form
- White cell trapping → leukocytes adhere to endothelium, release proteolytic enzymes and free radicals
- Tissue hypoxia + chronic inflammation → lipodermatosclerosis → skin breakdown → ulcer
Features of venous ulcer:
- Site: Gaiter area (medial malleolus - area of Cockett's perforators)
- Shallow, irregular edges, sloping edges
- Wet, granulating base
- Surrounding skin: lipodermatosclerosis, varicose eczema, haemosiderin pigmentation
- Relatively painless unless infected
- ABPI (Ankle-Brachial Pressure Index) > 0.8 (unlike arterial ulcers)
Management of Venous Ulcer
Conservative:
- Compression therapy: Mainstay. 4-layer graduated compression bandaging achieves 30-40 mmHg. Reduces venous hypertension and promotes healing
- Leg elevation
- Wound care: debridement, appropriate dressings (hydrocolloid, foam)
- Treat infection with antibiotics only if clinical signs present (not routine)
- Pentoxifylline (improves microcirculation)
Surgical:
- Early endovenous ablation of superficial venous reflux (EVLA - endovenous laser ablation, or RFA - radiofrequency ablation) almost halves the time to healing and reduces recurrence
- Foam sclerotherapy for small varices
- SEPS (subfascial endoscopic perforator surgery) for incompetent perforators
KEY TRIAL: ESCHAR trial showed venous surgery reduces ulcer recurrence but does not affect healing rate.
Q3. Enumerate Classification of Breast Lump. Discuss Clinical Features & Management of T2N1M0 Carcinoma Breast.
Classification of Breast Lump
| Age Group | Benign Causes | Malignant Causes |
|---|
| Young (15-30) | Fibroadenoma (#1 benign), breast cyst, fat necrosis, abscess | Rare |
| Reproductive (30-50) | Fibrocystic disease, ANDI, Phyllodes tumor, adenoma, galactocele | Early carcinoma |
| Older (>50) | Cysts, lipoma, sebaceous cyst | Carcinoma (#1 cause) |
Triple Assessment (gold standard) = Clinical + Imaging (USS/Mammography) + Histology (FNAC/Core biopsy)
T2N1M0 Carcinoma Breast
TNM Staging:
- T2: Primary tumor 2-5 cm in greatest dimension
- N1: Movable ipsilateral axillary lymph nodes involved (1-3 nodes)
- M0: No distant metastasis
- Stage: IIIA → actually this is Stage IIB
Clinical Features:
Local:
- Lump 2-5 cm, hard, irregular, non-tender
- May have skin attachment, tethering to deep structures
- Peau d'orange (skin dimpling/orange peel appearance due to lymphatic obstruction)
- Nipple retraction, nipple discharge (blood-stained)
- Palpable ipsilateral mobile axillary nodes
Systemic (none for M0):
- No hepatomegaly, no bone pain, no lung symptoms in M0 disease
Investigations:
- Mammography: Spiculate opacity, microcalcifications
- USS breast: Solid irregular hypoechoic mass
- Core needle biopsy: Gold standard for tissue diagnosis; provides ER, PR, HER2 receptor status
- Staging CT chest/abdomen/pelvis: For M0 confirmation
- Bone scan if symptomatic
- Sentinel lymph node biopsy assessment
Management of T2N1M0 (Stage IIB):
Surgical:
- Modified Radical Mastectomy (MRM) = total mastectomy + level I-III axillary clearance - OR -
- Breast conserving surgery (BCS) = wide local excision + axillary node clearance + mandatory adjuvant radiotherapy (both options have equal survival)
Adjuvant Therapy (based on receptor status):
| Receptor | Treatment |
|---|
| ER/PR positive | Tamoxifen (premenopausal) or Aromatase inhibitor (postmenopausal) x 5-10 years |
| HER2 positive | Trastuzumab (Herceptin) x 1 year |
| Triple negative | Chemotherapy only |
- Chemotherapy: Anthracycline-based (FAC/FEC) or Taxane regimens. May be neoadjuvant (to downstage) or adjuvant
- Radiotherapy: Mandatory after BCS; also to chest wall after MRM if high-risk features
- Reconstruction (if mastectomy): Immediate or delayed, implant or autologous (TRAM, DIEP flap, LD flap)
SHORT QUESTIONS (Any 4) [4 x 5 = 20]
1. Hypertrophic Pyloric Stenosis (HPS)
Definition: Hypertrophy of the circular muscle of the pylorus causing gastric outlet obstruction in infants.
Epidemiology:
- Incidence: 1 in 300-900 live births
- Most common: 2-8 weeks of age
- Male: Female = 4:1; first-born males most at risk
- Cause: Unknown; deficiency of nitric oxide synthase in pyloric tissue implicated
Clinical Features:
- Progressively worsening, projectile, non-bilious vomiting (bile is produced distally - NOT bile-stained is key)
- Baby remains hungry after vomiting ("hungry vomiter")
- Visible gastric peristalsis (left upper quadrant to epigastrium)
- Palpable pyloric "olive" in epigastrium (pathognomonic - no further imaging needed)
- Signs of dehydration
- Metabolic derangement: Hypokalaemic, hypochloraemic metabolic alkalosis
Investigations:
- USS (ultrasound) first line: pyloric muscle thickness >3-4 mm, length >15-18 mm
- Electrolytes: hypokalemia, hypochloremia, raised bicarbonate
- Upper GI contrast if equivocal (shows "string sign" or "double track sign")
Management:
- NOT a surgical emergency - resuscitate first
- IV fluids: Normal saline bolus 20 mL/kg then D5 ½ NS + 20 mEq/L KCl
- Correct to serum bicarbonate <30 mEq/L, chloride >95 mEq/L before surgery
- Ramstedt's Pyloromyotomy (Fredet-Ramstedt procedure): Longitudinal incision through the hypertrophied pyloric muscle down to intact mucosa. Can be laparoscopic or open.
2. Phyllodes Tumor of Breast
Definition: A rare fibroepithelial tumor of the breast, predominantly stromal, with a "leaf-like" architecture (Greek: phylon = leaf).
Classification (WHO):
- Benign (60-75%)
- Borderline (15-20%)
- Malignant (10-15%)
Clinical Features:
- Age: Usually 35-55 years (10-20 years older than fibroadenoma)
- Large, rapidly growing breast lump
- Smooth, lobulated, firm-to-rubbery mass
- Skin stretched, shiny, prominent veins visible
- Rarely: skin ulceration (from pressure necrosis, not malignant invasion)
- Axillary nodes NOT typically involved (unlike carcinoma)
- Lung most common site for metastasis (hematogenous, not lymphatic)
Diagnosis:
- Core needle biopsy preferred (FNAC insufficient to distinguish from fibroadenoma)
- Histology: leaf-like intracanalicular growth pattern, hypercellular stroma
Management:
- Wide local excision with at least 1 cm clear margins (even for benign - higher recurrence if margins inadequate)
- Simple mastectomy for large tumors or if clear margins not achievable
- Axillary dissection NOT required (lymphatic spread is rare)
- No role for radiotherapy or chemotherapy in benign/borderline
- Malignant: chemotherapy (ifosfamide + doxorubicin) for metastatic disease
3. Ventricular Septal Defect (VSD)
Definition: An abnormal communication between the two ventricles through the interventricular septum.
Classification (by location):
- Perimembranous/Membranous (80%) - most common, near aortic valve
- Muscular (5-20%)
- Inlet/AV canal type (8%)
- Outlet/Supracristal/Conal (5-7%) - associated with aortic regurgitation
Pathophysiology:
- Left-to-right shunt (systemic pressure > pulmonary pressure)
- Shunt magnitude depends on defect size and pulmonary vascular resistance (PVR)
- Increased pulmonary blood flow → pulmonary hypertension → Eisenmenger syndrome (reversal to R→L shunt, cyanosis) if untreated
Clinical Features:
| Small VSD | Large VSD |
|---|
| Asymptomatic | Breathlessness, poor feeding, FTT |
| Harsh pansystolic murmur at LLSE | Pansystolic murmur |
| "Maladie de Roger" | Heart failure in infancy |
- Loud pansystolic murmur at left lower sternal edge (LLSE), 4th intercostal space
- Thrill palpable
- Signs of heart failure if large: tachycardia, hepatomegaly, recurrent LRTI
Investigations:
- CXR: Cardiomegaly, increased pulmonary vascularity
- ECG: Biventricular hypertrophy
- Echo (2D + Doppler): Gold standard - confirms defect, quantifies shunt (Qp:Qs)
- Cardiac catheterization (if surgical planning)
Management:
- Small VSD: Conservative. 50% close spontaneously by age 3; SBE prophylaxis
- Large/symptomatic: Diuretics + digoxin + ACE inhibitors to control heart failure, then surgery
- Surgical: Patch closure (Dacron/pericardial patch) via median sternotomy on cardiopulmonary bypass; or transcatheter device closure (Amplatzer occluder) for suitable anatomy
- Eisenmenger syndrome: Contraindication to surgical repair; managed with pulmonary vasodilators (sildenafil, bosentan)
4. DVT Prophylaxis
Deep Vein Thrombosis (DVT) Risk - Virchow's Triad:
- Stasis of blood flow
- Endothelial injury
- Hypercoagulable state
Risk Stratification (Caprini/Wells score):
| Risk Level | Patient Type |
|---|
| Low | Minor surgery <45 min, ambulatory |
| Moderate | Major surgery, BMI >30, HRT use |
| High | Hip/knee replacement, pelvic surgery, cancer, prior DVT/PE |
| Very High | Multiple risk factors, prolonged immobility |
Prophylactic Measures:
Mechanical:
- Early ambulation (most effective simple measure)
- Graduated compression stockings (TED stockings) - class II, 18-23 mmHg
- Intermittent pneumatic compression (IPC) devices - preferred intraoperatively
- Foot pumps
Pharmacological:
- LMWH (Low Molecular Weight Heparin): Enoxaparin 40 mg SC OD or Dalteparin 5000 units SC OD - first choice. Start 12 hours pre-op or 6-12 hours post-op
- Unfractionated heparin (UFH): 5000 units SC BD/TDS - used when eGFR <30
- Fondaparinux: 2.5 mg SC OD - especially for hip/knee surgery
- DOACs (Direct Oral Anticoagulants): Rivaroxaban, Apixaban - for elective hip/knee arthroplasty
Duration:
- General surgery: until fully mobile (5-7 days minimum)
- Orthopedic (hip/knee): 28-35 days extended prophylaxis
- Cancer surgery: Extended (28 days) LMWH recommended
5. Flail Chest
Definition: When 3 or more consecutive ribs are each fractured in 2 or more places, creating a free-floating segment of chest wall that moves paradoxically with breathing.
Mechanism:
- High-velocity blunt trauma to the chest (RTA, crush injury)
- The flail segment moves INWARD on inspiration and OUTWARD on expiration (paradoxical movement) - opposite to the rest of the chest wall
Pathophysiology:
- Paradoxical movement reduces effective tidal volume
- Underlying pulmonary contusion is almost always present and contributes significantly to hypoxia
- Mediastinal shift ("pendelluft" phenomenon) - outdated concept
Clinical Features:
- History of significant chest trauma
- Dyspnea, tachypnea, hypoxia
- Paradoxical chest wall movement (visible)
- Chest wall tenderness, crepitus
- Signs of respiratory failure: cyanosis, accessory muscle use
- Associated injuries: pneumothorax, haemothorax, cardiac contusion
Diagnosis:
- Clinical primarily
- CXR: Multiple rib fractures (may underestimate number)
- CT chest: Accurately defines fractures, pulmonary contusion, pneumo/haemothorax
Management:
Immediate ATLS approach:
- High-flow O2
- Pain control: Epidural analgesia is GOLD STANDARD (allows deep breathing without splinting)
- IV analgesia (opioids, NSAIDs, intercostal nerve blocks)
Specific:
- If tolerated: Supplemental oxygen, physio, incentive spirometry
- Mechanical ventilation (IPPV): Gold standard for internal pneumatic stabilization - indicated if: SpO2 <90%, RR >30, hypercapnia, associated injuries, pre-existing lung disease. Continue for up to 3 weeks while ribs heal
- Surgical rib fixation (ORIF): Increasingly used; plates/screws to stabilize the flail segment; reduces ICU/ventilator time
VERY SHORT QUESTIONS (Any 10) [10 x 2 = 20]
1. Trendelenburg Test
Tests for incompetence of the saphenofemoral junction (SFJ) and perforating veins in varicose veins.
Technique:
- Patient supine, elevate leg to empty superficial veins
- Apply tourniquet to upper thigh (to occlude GSV)
- Ask patient to stand
Interpretation:
- Negative (normal): Veins fill slowly from below (through perforators) over 30 seconds; on tourniquet release, no sudden further filling
- Tourniquet test positive (SFJ incompetent): On releasing tourniquet, sudden rush of blood fills the veins from above = SFJ incompetence
- Double-positive (perforator + SFJ incompetence): Veins fill rapidly even with tourniquet on, and further fill on release
- Tourniquet can be applied at different levels to locate incompetent perforators
2. Critical Limb Ischemia (CLI)
Definition (TASC II criteria): Chronic ischemia with:
- Rest pain persisting for >2 weeks, requiring analgesia AND ankle systolic pressure <50 mmHg or toe pressure <30 mmHg, OR
- Tissue loss (ulceration or gangrene) with ankle systolic pressure <50 mmHg or toe pressure <30 mmHg
Features:
- Severe rest pain (especially at night, relieved by hanging leg down)
- Non-healing ulcers or frank gangrene
- ABI typically <0.4
Management: Revascularization (angioplasty/bypass) urgently to salvage limb, or amputation if not possible.
3. Lipodermatosclerosis
A form of panniculitis (inflammation of the subcutaneous fat) occurring as a complication of chronic venous hypertension.
Features:
- Affects gaiter area (lower third of leg, medial aspect)
- Skin becomes thickened, indurated, brown (haemosiderin deposition)
- Fibrosis of skin and subcutaneous tissue
- "Inverted champagne bottle" or "inverted wine bottle" appearance - lower calf narrow, upper calf normal
- Precedes venous ulcer formation
- Painful when acute; chronic form is firm and non-tender
Treatment: Compression therapy; treatment of underlying venous disease.
4. Rest Pain in PAD (Peripheral Arterial Disease)
Definition: Constant, severe ischemic pain in the foot at rest, indicating severe limb-threatening ischemia (CLI).
Characteristics:
- Affects toes and forefoot (distal most territory)
- Worse at night (cardiac output falls, gravity no longer assists)
- Relieved by hanging the leg down or sleeping in a chair (hence "dependency")
- ABI typically <0.4 (<50 mmHg ankle pressure)
Significance: Rest pain = Fontaine Stage III (or Rutherford categories 4-6). Limb is at immediate risk. Revascularization required urgently.
5. Line of Demarcation in Ischemic Limb
Definition: A visible line between viable (living) and non-viable (gangrenous) tissue in a limb with dry gangrene.
Features:
- Appears after several days to weeks of arterial occlusion
- The ischemic tissue mummifies (dry gangrene) due to the drying effect of air
- The line represents where inflammatory reaction meets dead tissue
- Proximal side: hyperaemic, inflamed skin
- Distal side: black, shrunken, mummified tissue
Clinical significance:
- Amputation should be performed at or just proximal to the line of demarcation (where healing can occur)
- Never amputate through wet gangrene (infected) - risk of spreading infection; control sepsis first
6. Indications for Intercostal Drain (ICD)
Indications:
- Pneumothorax:
- Tension pneumothorax (emergency needle decompression first, then ICD)
- Large spontaneous pneumothorax (>2 cm rim) not responding to aspiration
- Traumatic pneumothorax
- Any pneumothorax in ventilated patient
- Haemothorax: Traumatic or spontaneous
- Pleural effusion: Large symptomatic, empyema thoracis, malignant effusion
- Empyema thoracis
- Chylothorax
- Post-operative: After thoracic surgery (thoracotomy, cardiac surgery)
- Haemo-pneumothorax
Insertion: 4th/5th intercostal space, mid-axillary line (safe triangle: bounded by pectoralis major, latissimus dorsi, base of axilla and line above nipple). Pass over the upper border of the rib below (to avoid neurovascular bundle which runs at lower border of rib above).
7. Peau d'Orange
Definition: French for "skin of an orange." A clinical sign of locally advanced breast cancer or inflammatory breast cancer.
Mechanism:
- Lymphatic obstruction by tumor cells in subdermal lymphatics
- Causes skin and subcutaneous tissue to become edematous
- Hair follicles and sweat gland orifices are tethered to dermis and cannot swell, while surrounding skin does
- Result: dimpled, pitted appearance resembling orange skin
Clinical significance:
- Indicates advanced local disease (T4b)
- Associated with inflammatory carcinoma (which shows peau d'orange over >1/3 of breast)
- May also occur in severe breast infections (mastitis)
Demonstration: Best seen with tangential lighting and gentle skin pinching
8. Saphena Varix
Definition: A saccular dilatation (blowout) of the great saphenous vein at the saphenofemoral junction (SFJ), just below the inguinal ligament.
Features:
- Appears as a soft, compressible swelling in the groin (upper medial thigh)
- Classically disappears on lying down (empties when recumbent)
- Shows a transmitted cough impulse (communicates with the venous system)
- Associated with varicose veins of the great saphenous system
- Saphena varix in the groin is a SOFT, COMPRESSIBLE, REDUCIBLE lump that has a COUGH IMPULSE - can be confused with femoral hernia
Key Difference from Femoral Hernia:
- Saphena varix: disappears on lying down, no bowel sounds, soft, associated varicosities
- Femoral hernia: does not fully disappear, may be irreducible
9. Transmitted Pulsations
In a lump, pulsation may be:
-
Expansile pulsation: The lump expands in all directions with each cardiac pulsation = lump is PULSATILE = the lump itself is pulsating (e.g., true arterial aneurysm, AV fistula). Test: place two index fingers on either side of the lump - if they are pushed apart = expansile.
-
Transmitted pulsation: The lump merely rocks back and forth with cardiac contraction = pulsation is transmitted to the lump from an adjacent artery (e.g., a lymph node overlying the aorta). The fingers are NOT pushed apart.
Clinical significance:
- Expansile pulsation = arterial/vascular lesion (requires vascular surgery evaluation)
- Transmitted = benign characteristic (the lump is simply adjacent to an artery)
10. Compressible Swelling
A swelling that reduces in size on compression and refills on release.
Types and significance:
| Type | Examples |
|---|
| Compressible only | Lipoma (partially), soft tissue tumors |
| Compressible + Fluctuant | Cyst, abscess |
| Compressible + Reducible | Hernia (goes back into abdomen through a defect) |
| Compressible + Cough impulse + Reducible | Hernia |
| Compressible + Pulsatile | Aneurysm |
| Compressible + Emptying into veins | Saphena varix, venous malformations |
Note: A compressible swelling refills after release. A reducible swelling (hernia) does not refill - it empties into another cavity and only returns when pressure is applied (e.g., coughing, straining).
11. Intermittent Claudication
Definition: Reproducible, cramp-like pain in the lower limb muscles (most commonly calf) that occurs on walking a predictable distance, is relieved within a few minutes of rest, and returns on walking the same distance again.
Cause: Atherosclerosis of peripheral arteries causing inadequate blood supply to muscles during exercise (relative ischemia). Aortoiliac disease → buttock and thigh claudication (Leriche syndrome). Femoral disease → calf claudication.
Fontaine Classification:
- Stage I: Asymptomatic
- Stage IIa: Claudication >200 m
- Stage IIb: Claudication <200 m
- Stage III: Rest pain
- Stage IV: Ulcer/gangrene
Natural History: Only ~25% progress to critical limb ischemia over 5 years. Most die from MI/stroke (coronary and cerebral atherosclerosis).
Management:
- Risk factor modification: Stop smoking (#1), control diabetes, hypertension, hyperlipidemia
- Supervised exercise programme (gold standard conservative treatment - improves walking distance)
- Antiplatelet therapy: Aspirin 75 mg or clopidogrel
- Statin therapy
- Revascularization (angioplasty/bypass) for severe or disabling claudication
12. Duplex Scan (Duplex Ultrasonography)
Definition: Combination of B-mode (brightness mode) grey-scale ultrasound + Doppler flow analysis in a single investigation. Modern versions add color Doppler (triplex scan).
Components:
- B-mode USS: Real-time anatomical imaging - shows vessel lumen, wall, plaque, thrombus
- Color Doppler: Color codes blood flow direction (red = toward probe, blue = away)
- Pulse-wave Doppler: Gives flow velocity waveform; can measure peak systolic velocity (PSV) ratio to grade stenosis
Applications in Surgery:
- Varicose veins/venous disease: Locate incompetent SFJ, SPJ, perforators; map venous reflux (key pre-surgical planning)
- DVT diagnosis: Shows non-compressible vein, absent flow, thrombus
- Peripheral arterial disease: Grades stenosis, plans revascularization
- Carotid artery disease: Screens for carotid stenosis before endarterectomy
- AAA (aortic aneurysm): Surveillance
- Renal artery stenosis
Advantages: Non-invasive, no radiation, cheap, repeatable, real-time.
ORTHOPEDIC SECTION [2 Questions] [2 x 10 = 20]
Q1. Describe Types & Pathology of Osteomyelitis. Discuss Its Treatment.
Definition
Osteomyelitis is bone and marrow inflammation, virtually always secondary to infection.
Types of Osteomyelitis
A. Based on Duration:
- Acute Osteomyelitis (<2-3 weeks)
- Subacute Osteomyelitis (Brodie's abscess)
- Chronic Osteomyelitis (>6 weeks, or recurrent)
B. Based on Pathogenesis (Cierny-Mader Classification):
- Hematogenous: Most common in children; affects metaphysis of long bones (rich blood supply, sluggish flow, lack of phagocytes)
- Contiguous spread: From adjacent infection (diabetic foot, decubitus ulcer, sinusitis)
- Direct inoculation: Post-trauma (open fracture), post-surgical
C. Based on Causative Organism:
- Pyogenic (bacterial) - most common
- Tuberculous osteomyelitis (Pott's disease - spine)
- Fungal (immunocompromised)
- Viral
Pathology
Causative organisms:
- Staphylococcus aureus - most common at all ages (binds to bone collagen)
- Neonates: Group B Streptococcus, E. coli
- Sickle cell disease: Salmonella species
- Diabetic foot: Polymicrobial
Pathological stages:
Acute phase (0-48 hrs):
- Bacteria arrive in metaphysis via blood
- Neutrophilic infiltration, edema, suppuration
- Bone cell necrosis within 48 hours
- Pus tracks through Haversian canals to periosteum → subperiosteal abscess
- Periosteal stripping → impairs blood supply → further necrosis
Chronic phase:
- Necrotic bone = SEQUESTRUM (dead bone fragment; avascular, antibiotic cannot penetrate)
- New bone formation by periosteum surrounds the sequestrum = INVOLUCRUM (living shell of new bone)
- Pus may breach involucrum through openings (cloacae) → tracks to skin surface = sinus tract
- Brodie's abscess: Subacute form - localized intramedullary abscess, typically in proximal or distal tibia, in children
Clinical Features
- Fever, malaise, rigors (systemic)
- Severe local bone pain (constant, throbbing)
- Swelling, redness, warmth, tenderness over affected bone
- Pseudoparalysis (infant refuses to move limb)
- Chronic osteomyelitis: Chronic discharging sinus, pathological fracture
Investigations
- FBC: Leukocytosis, raised ESR, CRP
- Blood cultures (positive in ~50%)
- X-ray: Periosteal reaction, lytic lesion (appears 10-14 days late)
- MRI: Best modality - shows marrow edema within 24-48 hrs (most sensitive)
- Bone scan (Tc-99m): Useful for multifocal disease
- Bone biopsy + culture: Definitive for organism identification
Treatment
Acute Hematogenous Osteomyelitis:
Medical:
- IV antibiotics immediately (after blood cultures and bone biopsy if possible)
- Anti-staphylococcal: Flucloxacillin + Fusidic acid (or clindamycin); MRSA: Vancomycin/Teicoplanin
- Duration: 4-6 weeks total (IV → oral step-down after clinical improvement)
- Splinting for pain relief and to prevent pathological fracture
Surgical:
- Indications: Failure to respond to IV antibiotics after 24-36 hrs, abscess formation, spreading sepsis
- Surgical drainage: Drill holes (Trueta's method) into medulla to decompress and drain pus
- Subperiosteal abscess: Incision and drainage
Chronic Osteomyelitis:
Surgical (mainstay):
- Sequestrectomy: Removal of all dead bone (sequestrum) - key step
- Saucerisation: Converting the bone cavity to an open saucer to allow drainage and granulation
- Dead space management: Fill cavity with cancellous bone graft, muscle flap, or antibiotic-impregnated cement beads (Papineau technique)
- Treatment of sinus tracts: Excision
- Correction of deformity (Ilizarov technique for limb shortening/deformity)
- Amputation: For failed treatment, uncontrolled sepsis, malignant change in sinus (Marjolin's ulcer)
Complications of chronic osteomyelitis:
- Pathological fracture
- Septic arthritis
- Secondary amyloidosis
- Squamous cell carcinoma in sinus (Marjolin's ulcer)
- Sarcoma
Q2. Orthopedic Short Questions
A. Colles' Fracture
Definition: A transverse fracture of the distal radial metaphysis within 2.5 cm of the radiocarpal joint, with dorsal displacement and dorsal angulation of the distal fragment.
Mechanism:
- Fall on an outstretched hand (FOOSH) with wrist dorsiflexed
- Common in: Postmenopausal women (osteoporosis), elderly
- "Dinner fork deformity" or "garden spade deformity" - classic description
Displacement (DESK mnemonic):
- Dorsal displacement of distal fragment
- External (radial) deviation
- Supination of fragment
- Shortening of radius
Associated injuries:
- Ulnar styloid fracture (60%)
- Interosseous membrane injury
- Median nerve injury (most common nerve complication - assess before and after reduction)
Investigations:
- PA and lateral X-ray wrist: Normal volar tilt (~10-11°) is lost/reversed; normal radial inclination (~22°) is reduced
Management:
Non-operative (most cases):
- Closed reduction under local anaesthesia (haematoma block or Bier's block)
- Manipulation: Traction + flexion + ulnar deviation + pronation to restore anatomy
- Immobilization in plaster of Paris (POP) dorsal back slab/below-elbow cast for 4-6 weeks
- Check neurovascular status post-reduction; X-ray to confirm
- Physiotherapy after cast removal
Operative indications:
- Comminuted, unstable, or intraarticular fractures
- Failed closed reduction (>20° dorsal angulation, >5 mm shortening)
- Young active patients
- Neurovascular compromise
Surgical options:
- Percutaneous K-wire fixation
- Volar locking plate (ORIF) - most common
- External fixation (highly comminuted)
Complications:
- Malunion (most common)
- Median nerve injury/carpal tunnel syndrome
- Rupture of Extensor Pollicis Longus (EPL) tendon
- Sudeck's atrophy (CRPS - Complex Regional Pain Syndrome)
- Shoulder-hand syndrome
- Stiffness
B. Indications for Amputation
Definition: Amputation = surgical removal of a limb or part of it.
Indications (mnemonic: "DIVERT"):
1. Diabetes and its complications (60-80% of amputations):
- Diabetic foot with non-healing ulcer, wet gangrene, spreading infection
- Uncontrolled foot abscess is a surgical emergency
2. Ischemia (Peripheral Arterial Disease):
- Critical limb ischemia where revascularization has failed or is not possible
- Dry/wet gangrene, non-viable limb
3. Infection:
- Uncontrolled ascending infection/sepsis (life-saving)
- Chronic osteomyelitis unresponsive to treatment
- Gas gangrene (clostridial myonecrosis) - emergency amputation
4. Vascular (non-diabetic):
- Severe Buerger's disease (thromboangiitis obliterans)
- Severe Raynaud's phenomenon
5. Extensive Trauma:
- Mangled extremity (MESS score ≥7 predicts need for amputation)
- Traumatic amputation requiring formal surgical revision
- After crush injury with warm ischemia >6 hours + posterior tibial nerve disruption
6. Tumors:
- Malignant bone/soft tissue tumors where limb salvage is impossible (Osteosarcoma, Ewing's sarcoma)
- Locally advanced malignancy with intractable pain/infection
7. Congenital:
- Severe congenital limb anomalies where amputation + prosthesis gives better function
8. Neurological:
- Intractable pain (rare)
- Complete denervation with insensate, non-functional limb
Levels of Amputation (lower limb):
- Toe / Ray amputation
- Transmetatarsal
- Syme's (ankle disarticulation)
- Below-knee amputation (BKA / transtibial) - preferred; better functional outcome
- Knee disarticulation
- Above-knee amputation (AKA / transfemoral)
- Hip disarticulation
Guillotine amputation: Emergency, open-ended amputation used when sepsis is not controlled. Closed formally at a later stage.
Sources: Bailey and Love's Short Practice of Surgery 28th Edition; Sabiston Textbook of Surgery 20th Edition; Schwartz's Principles of Surgery 11th Edition; Robbins & Kumar Basic Pathology; Current Surgical Therapy 14e; Mulholland and Greenfield's Surgery 7e; Rosen's Emergency Medicine; Tintinalli's Emergency MedicineAll answers have been compiled above. Here is a quick navigation guide for the entire paper:
Summary of What Was Covered
Long Questions (3 options, attempt any 2):
- Q1 - Perforation Peritonitis: Full etiology list + clinical features of peptic perforation (3 stages) + management (Graham's patch, H. pylori eradication)
- Q2 - Venous Ulcer: Venous anatomy with diagram + pathophysiology (fibrin cuffs, white cell trapping) + management (compression + EVLA)
- Q3 - Carcinoma Breast T2N1M0: Breast lump classification + T2N1M0 = Stage IIB features + MRM vs BCS + adjuvant therapy by receptor status
Short Questions (5 options, attempt any 4):
- HPS: Projectile non-bilious vomiting, olive mass, metabolic alkalosis, Ramstedt's pyloromyotomy
- Phyllodes Tumor: Rapidly enlarging lump, 3 grades, wide excision with 1 cm margins
- VSD: Types, L→R shunt, pansystolic murmur at LLSE, patch closure
- DVT Prophylaxis: Virchow's triad, TED stockings + LMWH, extended duration for ortho/cancer
- Flail Chest: Paradoxical movement, pulmonary contusion, epidural analgesia + IPPV
Very Short Questions (12 options, attempt any 10): All 12 answered - Trendelenburg test, CLI, lipodermatosclerosis, rest pain, line of demarcation, ICD indications, peau d'orange, saphena varix, transmitted pulsations, compressible swelling, intermittent claudication, duplex scan
Orthopaedic Section: Osteomyelitis (types, sequestrum/involucrum pathology, sequestrectomy treatment) + Colles' fracture (dinner fork deformity, reduction + POP) + Indications for amputation (diabetes 60-80%, ischemia, infection, trauma, tumors)