Make ppt on snale bite management 20 slides make simple slides

Reading File
Reading File
Running Command

mkdir -p /home/daytona/workspace/snakebite-ppt

Writing File

~/snakebite-ppt/create_ppt.js

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pres.title = 'Snake Bite Management';
pres.author = 'Medical Education';

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// ══════════════════════════════════════════════════════════════════════════════
// SLIDES
// ══════════════════════════════════════════════════════════════════════════════

// Slide 1 – Title
titleSlide(pres, "Snake Bite Management", "Emergency Diagnosis & Treatment Guide");

// Slide 2 – Overview / Contents
contentSlide(pres, "Overview", [
  "1.  Introduction & Epidemiology",
  "2.  Types of Venomous Snakes",
  "3.  Pathophysiology of Envenomation",
  "4.  Clinical Features",
  "5.  Severity Classification",
  "6.  First Aid – Do's & Don'ts",
  "7.  Hospital Assessment",
  "8.  Investigations",
  "9.  Anti-Snake Venom (ASV) Therapy",
  "10. Supportive & Specific Treatment",
  "11. Complications & Discharge",
  "12. Prevention & Public Health"
]);

// Slide 3 – Epidemiology
contentSlide(pres, "Epidemiology & Global Burden", [
  "~5.4 million snake bites occur worldwide every year",
  "~2.7 million envenomations annually",
  "~81,000 – 138,000 deaths per year globally",
  "India accounts for ~50,000+ deaths annually — highest in the world",
  "Sub-Saharan Africa and South/Southeast Asia are most affected",
  "Rural agricultural workers and children are highest-risk groups",
  "Classified as a Neglected Tropical Disease (NTD) by WHO since 2017",
  "Under-reporting is a major challenge in low-income settings"
]);

// Slide 4 – Types of Venomous Snakes (two-column)
twoColSlide(pres,
  "Common Venomous Snakes",
  "India – Big Four",
  [
    "Indian Cobra (Naja naja)",
    "Russell's Viper (Daboia russelii)",
    "Common Krait (Bungarus caeruleus)",
    "Saw-Scaled Viper (Echis carinatus)",
    "Also: King Cobra, Hump-nosed Pit Viper"
  ],
  "Global Classification",
  [
    "Elapidae – Cobras, Kraits, Mambas, Coral snakes",
    "Viperidae – Vipers, Rattlesnakes, Pit vipers",
    "Hydrophiidae – Sea snakes",
    "Colubridae – Mostly non-venomous; some rear-fanged",
    "500+ species capable of harming humans"
  ]
);

// Slide 5 – Pathophysiology
contentSlide(pres, "Pathophysiology of Envenomation", [
  "Venom is a complex mixture of proteins, enzymes, and peptides",
  "Cytotoxins (Vipers): tissue necrosis, local swelling, coagulopathy",
  "Neurotoxins (Elapids/Kraits): block neuromuscular junction → paralysis",
  "Hemotoxins: consume clotting factors → disseminated intravascular coagulation (DIC)",
  "Myotoxins (Sea snakes, some vipers): rhabdomyolysis → renal failure",
  "Cardiotoxins: direct myocardial depression, arrhythmias",
  "Local: phospholipase A₂ causes cell membrane destruction",
  "Systemic spread via lymphatics → bloodstream within minutes"
]);

// Slide 6 – Clinical Features (two-column)
twoColSlide(pres,
  "Clinical Features",
  "Local Effects",
  [
    "Pain and burning at bite site",
    "Swelling and erythema (within minutes)",
    "Blistering and tissue necrosis (cytotoxic)",
    "Fang marks (may be absent in Krait bites)",
    "Lymphangitis and lymphadenopathy",
    "Compartment syndrome (severe cases)"
  ],
  "Systemic Effects",
  [
    "Neurotoxic: ptosis, diplopia, dysarthria, respiratory paralysis",
    "Coagulopathic: bleeding gums, hematemesis, haematuria",
    "Cardiovascular: hypotension, arrhythmia, shock",
    "Renal: oliguria, haematuria → AKI",
    "Myotoxic: myalgia, myoglobinuria, dark urine",
    "General: nausea, vomiting, abdominal pain"
  ]
);

// Slide 7 – Severity Classification
contentSlide(pres, "Severity Classification", [
  "Grade 0 – Dry bite: Fang marks only, no envenomation symptoms",
  "Grade 1 – Mild: Local swelling/pain, no systemic signs",
  "Grade 2 – Moderate: Local swelling >5 cm from bite, mild systemic signs",
  "Grade 3 – Severe: Extensive local effects + significant systemic involvement",
  "Grade 4 – Critical: Neurotoxicity, coagulopathy, haemodynamic instability",
  "Neurotoxic severity – FOUR-point scale: pre-synaptic vs post-synaptic",
  "20-Minute Whole Blood Clotting Test (20WBCT): key bedside tool for viper bites",
  "Severity guides ASV dosing and ICU admission decisions"
]);

// Slide 8 – First Aid DO's
contentSlide(pres, "First Aid – What TO DO", [
  "Stay calm and reassure the patient — panic accelerates venom spread",
  "Immobilize the bitten limb — splint and keep at heart level",
  "Remove rings, watches, tight clothing near bite site",
  "Apply Pressure Immobilization Bandage (PIB) for Elapid bites (NOT vipers)",
  "Mark the edge of swelling with pen and note time",
  "Carry / transport the patient — minimize walking",
  "Transport urgently to nearest hospital with ASV",
  "Note snake appearance (color, pattern) or photograph if safe to do so",
  "Ensure airway is clear during transport"
]);

// Slide 9 – First Aid DON'Ts (alert/red slide)
alertSlide(pres, "First Aid – What NOT To Do", [
  "Do NOT incise, cut, or suck the wound",
  "Do NOT apply a tight tourniquet (causes ischemia/gangrene)",
  "Do NOT apply ice packs or immerse in cold water",
  "Do NOT apply electric shock or herbal remedies",
  "Do NOT give aspirin or NSAIDs (worsens bleeding)",
  "Do NOT rub the bite site",
  "Do NOT give alcohol, coffee, or stimulants",
  "Do NOT leave the patient alone",
  "Do NOT delay hospital transport to seek traditional healers"
], RED);

// Slide 10 – Hospital Assessment
contentSlide(pres, "Hospital Assessment", [
  "Detailed history: time of bite, snake type, first aid given",
  "Vital signs: BP, HR, RR, SpO₂, temperature",
  "Neurological: ptosis, ophthalmoplegia, limb weakness, GCS",
  "Local examination: swelling, necrosis, compartment pressure",
  "Haemostatic assessment: 20-Minute Whole Blood Clotting Test (20WBCT)",
  "Urine examination: haematuria, myoglobinuria (dark urine)",
  "Signs of shock: capillary refill, JVP, skin perfusion",
  "Respiratory function: peak flow, accessory muscle use, SpO₂",
  "Establish IV access, monitor urine output (catheterise if needed)"
]);

// Slide 11 – Investigations
twoColSlide(pres,
  "Investigations",
  "Bedside / Urgent",
  [
    "20-Minute Whole Blood Clotting Test (20WBCT)",
    "Blood glucose",
    "Urine dipstick (blood, protein)",
    "ECG (cardiac monitoring)",
    "SpO₂ / ABG if respiratory compromise"
  ],
  "Laboratory",
  [
    "CBC with platelets",
    "PT, aPTT, INR, Fibrinogen, D-dimer",
    "BUN, Creatinine (renal function)",
    "LFT, serum electrolytes",
    "Serum CPK (myotoxicity)",
    "Blood group and cross-match",
    "Peripheral smear (haemolysis)"
  ]
);

// Slide 12 – Anti-Snake Venom
contentSlide(pres, "Anti-Snake Venom (ASV) Therapy", [
  "ASV is the ONLY specific treatment for systemic envenomation",
  "Polyvalent ASV (India) covers Big Four snakes",
  "Indications: systemic signs, neurotoxicity, coagulopathy, local necrosis, 20WBCT positive",
  "Route: IV infusion (NOT IM) — dilute in 100 mL normal saline, infuse over 30–60 min",
  "Initial dose: 8–10 vials (same for adults and children)",
  "Repeat 20WBCT after 6 hours — if still incoagulable, repeat 8–10 vials",
  "Neurotoxicity non-responding: repeat dose every 1–2 hours up to 30–50 vials",
  "Monitor for anaphylaxis: adrenaline 0.5 mg SC/IM ready at bedside",
  "Prophylactic: IV hydrocortisone 200 mg + pheniramine maleate 22.75 mg before ASV"
]);

// Slide 13 – ASV Reactions
alertSlide(pres, "ASV Adverse Reactions & Management", [
  "Early anaphylactic reaction (within 10–180 min): urticaria, bronchospasm, hypotension",
  "Pyrogenic reactions (within 1–2 h): fever, chills, rigors — due to pyrogens",
  "Late serum sickness (5–14 days): fever, arthralgia, rash, lymphadenopathy",
  "Management of early reactions: STOP infusion immediately",
  "Give Adrenaline 0.5 mg IM (1:1000) — thigh injection",
  "IV antihistamine and IV corticosteroid",
  "Resume ASV at slower rate once stable",
  "Late serum sickness: oral prednisolone 5 mg/kg/day × 5 days",
  "Reactions do NOT contraindicate continued ASV use in life-threatening envenomation"
], "8B1A1A");

// Slide 14 – Neurotoxic Snake Bite Management
contentSlide(pres, "Management: Neurotoxic Envenomation", [
  "Post-synaptic block (Cobra): may respond to neostigmine + atropine",
  "Neostigmine test: 1.5–2 mg IM (adults) + atropine 0.6 mg IV — observe 1 hour",
  "If pupil dilation or ptosis improves: continue neostigmine 0.5 mg IM/SC every 30 min",
  "Pre-synaptic block (Krait, Mamba): neostigmine largely ineffective",
  "Airway management is critical — early intubation if SpO₂ falls or swallowing impaired",
  "Mechanical ventilation may be required for 1–3 weeks in Krait envenomation",
  "Regular monitoring: nerve conduction, peak expiratory flow, GCS",
  "Avoid sedatives and neuromuscular blockers unless intubating",
  "Recovery is complete if airway maintained during paralysis phase"
]);

// Slide 15 – Haemotoxic/Viper Management
contentSlide(pres, "Management: Haemotoxic (Viper) Envenomation", [
  "DIC is the hallmark — give ASV promptly to neutralize haematotoxins",
  "Fresh Frozen Plasma (FFP): 15 mL/kg to replenish clotting factors (only after ASV)",
  "Platelet transfusion if count <50,000/mm³ with active bleeding",
  "Packed Red Blood Cells for significant anaemia (Hb <7 g/dL)",
  "Cryoprecipitate if fibrinogen <1 g/L",
  "Strict IV site hemostasis — avoid IM injections",
  "Wound care: debridement of necrotic tissue; do NOT close wounds primarily",
  "Fasciotomy only if intracompartmental pressure >30 mmHg confirmed",
  "Monitor urine output hourly — target >0.5 mL/kg/h"
]);

// Slide 16 – Renal Failure Management
contentSlide(pres, "Management: Acute Kidney Injury (AKI)", [
  "AKI occurs in viper bites (haemotoxic), sea snake bites (myotoxic), rarely Krait",
  "Mechanism: haemoglobinaemia, myoglobinuria, DIC, hypotension",
  "Early and aggressive IV fluid resuscitation to maintain urine output",
  "IV Sodium Bicarbonate: alkalinize urine to prevent myoglobin tubular deposition",
  "Monitor serum creatinine, BUN, electrolytes every 6–12 hours",
  "Indications for dialysis: oliguria/anuria, rising creatinine, hyperkalemia, fluid overload",
  "Peritoneal dialysis or haemodialysis — both effective",
  "Dialysis may be required for weeks; renal recovery is usually complete",
  "Avoid nephrotoxic drugs: NSAIDs, aminoglycosides, contrast agents"
]);

// Slide 17 – Wound Care & Local Treatment
twoColSlide(pres,
  "Wound & Local Treatment",
  "Wound Care",
  [
    "Clean wound with antiseptic solution",
    "Leave bite wound open (do NOT suture)",
    "Debride necrotic tissue after 3–5 days",
    "Skin grafting may be needed post-necrosis",
    "Tetanus prophylaxis (toxoid/TIG)",
    "Antibiotics only if secondary infection signs",
    "Amoxicillin-clavulanate or metronidazole if anaerobic infection"
  ],
  "Compartment Syndrome",
  [
    "Tense swelling + pain on passive stretch",
    "Compartment pressure >30 mmHg",
    "Ensure adequate ASV given first",
    "Fasciotomy as last resort",
    "Do NOT fasciotomy without ASV (worsens bleeding)",
    "Limb elevation and physiotherapy post-treatment"
  ]
);

// Slide 18 – Special Situations
contentSlide(pres, "Special Situations & Complications", [
  "Pregnancy: ASV is safe — treat as normal; fetal monitoring required",
  "Children: same ASV dose as adults (venom amount is fixed)",
  "Eye exposure (spitting cobra): irrigate with large volumes of water; no ASV needed",
  "Sea snake bite: myoglobinuria, AKI; specific sea snake antivenom preferred",
  "Dry bite: observe for 12–24 h before discharge; 20WBCT at 0, 6, 12 h",
  "Secondary infections: Pseudomonas, Staphylococcus, anaerobes",
  "Psychological sequelae: PTSD, fear — address with counseling",
  "Long-term: limb deformity, chronic renal disease, skin scarring possible"
]);

// Slide 19 – Prevention
contentSlide(pres, "Prevention & Public Health Measures", [
  "Wear footwear and protective clothing in snake-prone areas",
  "Use a torch/flashlight when walking at night",
  "Do not put hands/feet in unseen areas (logs, rocks, holes)",
  "Clear bushes, debris, and rodent burrows around homes",
  "Sleep on raised beds with tucked-in mosquito nets",
  "Community education on first aid and NOT using harmful remedies",
  "Training community health workers to administer ASV in remote areas",
  "Ensure ASV supply chain reaches rural primary health centers",
  "WHO 2030 target: reduce snakebite deaths and disabilities by 50%",
  "National programs in India: NVBDCP snakebite protocol"
]);

// Slide 20 – Summary / Key Messages (dark closing slide)
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    "Immobilize and transport — time to ASV saves lives",
    "20WBCT is the single most important bedside test for viper envenomation",
    "ASV via IV infusion is the only definitive treatment",
    "Early airway management prevents death in neurotoxic bites",
    "Do NOT tourniquet, incise, or suck the wound",
    "Monitor for ASV reactions — adrenaline must be at bedside",
    "AKI is common with vipers — aggressive fluids and early dialysis",
    "Prevention, community education, and ASV access save the most lives"
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// ─── Write file ────────────────────────────────────────────────────────────────
pres.writeFile({ fileName: "/home/daytona/workspace/snakebite-ppt/Snake_Bite_Management.pptx" })
  .then(() => console.log("PPT created successfully!"))
  .catch(e => { console.error("Error:", e); process.exit(1); });
Running Command

cd /home/daytona/workspace/snakebite-ppt && node create_ppt.js

Your 20-slide PowerPoint is ready!

Snake Bite Management

Presentation · PPTX


Here's what's covered across all 20 slides:
#Slide Title
1Title Slide
2Overview / Contents
3Epidemiology & Global Burden
4Common Venomous Snakes (two-column)
5Pathophysiology of Envenomation
6Clinical Features - Local & Systemic (two-column)
7Severity Classification
8First Aid - What TO DO
9First Aid - What NOT To Do (red alert slide)
10Hospital Assessment
11Investigations (two-column)
12Anti-Snake Venom (ASV) Therapy
13ASV Adverse Reactions & Management (red alert)
14Neurotoxic Envenomation Management
15Haemotoxic (Viper) Management
16Acute Kidney Injury (AKI) Management
17Wound Care & Compartment Syndrome (two-column)
18Special Situations & Complications
19Prevention & Public Health
20Key Takeaways (dark closing slide)
Design: Dark green/gold color theme, clean header bars, bullet-point content, alert/red slides for critical warnings, two-column layouts for comparisons. Simple and easy to read.

Cns examination

Asking for Preferences
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Finding Sources
Finding Sources
Finding Sources
Finding Sources
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Finding Sources
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I now have comprehensive content from two authoritative sources. Let me compose the full detailed study guide.

CNS (Central Nervous System) Examination - Detailed Study Guide

Sources: S. Das - A Manual on Clinical Surgery 13th Ed; Tintinalli's Emergency Medicine: A Comprehensive Study

OVERVIEW: Framework of CNS Examination

A systematic CNS examination is divided into 8 elements:
  1. Mental Status Testing
  2. Higher Cerebral Functions
  3. Cranial Nerves (I-XII)
  4. Motor System
  5. Sensory System
  6. Reflexes
  7. Cerebellar Testing
  8. Gait and Station

1. MENTAL STATUS TESTING

Mental status assesses emotional and intellectual functioning. Every neurological encounter must include at least a brief assessment.

Appearance, Mood, Insight

  • Note orientation, behavior, affect, thought content
  • Assess for hallucinations or abnormal thought content

Consciousness / Sensorium

  • Sensorium = appropriate awareness and perception of consciousness
  • Use GCS (Eyes, Verbal, Motor) for objective grading

Attention

  • Digit repetition: Normal adult repeats 6-7 digits forward and 4-5 backward
  • Failure suggests confusion, delirium, or inattention

Memory

  • Long-term: Recall of events months/years ago
  • Short-term: Events of the day; 3-object recall at 5 minutes
    • State 3 objects → patient repeats immediately → re-test at 5 min
    • Failure to repeat immediately = attention problem
    • Failure at 5 min = short-term memory impairment

Orientation

  • Time (day, date, month, year)
  • Place (hospital, city, country)
  • Person (patient's own name, recognizing familiar faces)

2. HIGHER CEREBRAL FUNCTIONS

These functions are processed in the cerebral cortex.

Hemisphere Dominance

  • 90% of right-handed people: left hemisphere dominant for language
  • Most left-handed people are also left-hemisphere dominant
  • Dominant hemisphere: language, reading, writing, calculation
  • Non-dominant (right) hemisphere: spatial relationships, constructional ability, visual attention

Language Assessment

Two key syndromes to distinguish:
FeatureDysarthriaDysphasia (Aphasia)
MechanismMechanical - muscle weakness/incoordinationCortical/subcortical language center damage
Speech qualitySlurred, nasal, or explosiveMay be fluent or non-fluent
ComprehensionIntactMay be impaired
OriginMotor cortex, brainstem, CN, cerebellumCortex (Broca's/Wernicke's)

Types of Aphasia (Simplified)

Broca's (Expressive / Non-fluent) Aphasia:
  • Lesion: Broca's area, posterior inferior frontal lobe (dominant)
  • Speech: slow, halting, effortful, telegraphic
  • Comprehension: relatively preserved
  • Patient aware and frustrated
Wernicke's (Receptive / Fluent) Aphasia:
  • Lesion: Wernicke's area, posterior superior temporal lobe (dominant)
  • Speech: fluent but paraphasic (wrong words used)
  • Comprehension: severely impaired
  • Patient unaware of errors
Mixed / Global Aphasia: Both expression and comprehension impaired

Other Cortical Functions to Test

  • Apraxia: Inability to perform willed acts despite intact motor and sensory function; ask patient to demonstrate how objects are used
  • Agnosia: Inability to recognize objects despite intact sensation
  • Constructional ability: Ask patient to draw a clock face; placing all numbers on one side suggests non-dominant hemisphere lesion
  • Cortical sensory perception: Inability to identify objects by touch alone (stereognosis) with primary sensation intact

Speech Function Localisation

  • Motor aphasia (loss of power of speech without paralysis): dominant hemisphere lesion
  • Agraphia (loss of writing ability without paralysis): dominant hemisphere
  • Word-deafness (cannot understand spoken questions despite intact hearing): dominant temporal
  • Word-blindness (cannot understand written questions despite intact vision): dominant parietal-occipital

3. CRANIAL NERVE EXAMINATION

CN I - Olfactory Nerve

  • Test: Can the patient smell? Use non-irritant substances (coffee, vanilla) in each nostril separately
  • Anosmia (loss of smell): meningioma of olfactory groove, frontal lobe tumour
  • Parosmia (perversion of smell): lesion of uncinate gyrus (temporal lobe)

CN II - Optic Nerve

  • Visual acuity: Snellen chart or ask to read/count fingers
  • Visual fields (confrontation test): Patient fixes gaze, examiner moves a small white pin from periphery to center horizontally and vertically
Visual Field Defects:
DefectLesion Site
Monocular blindnessOptic nerve (ipsilateral)
Bitemporal hemianopiaOptic chiasm (e.g., pituitary tumor)
Homonymous hemianopiaOptic tract, radiation, or occipital cortex (contralateral)
Upper quadrantic bitemporalPituitary tumor (presses chiasm from below)
Lower quadrantic bitemporalSuprasellar cyst (presses chiasm from above)
  • Fundoscopy: Papilledema (raised ICP), optic atrophy, hemorrhages

CN III, IV, VI - Oculomotor, Trochlear, Abducent

Pupil examination:
  • Size and shape (normal: 2-6 mm, equal)
  • Dilated, non-reactive pupil: CN III palsy (oculomotor paralysis)
  • Pinpoint pupils: Pontine lesion or opiate toxicity
  • Light reflex: Direct and consensual (afferent: CN II; efferent: CN III)
  • Accommodation reflex: Near object causes pupil constriction + convergence
Ocular movements:
  • Test all six cardinal directions (head fixed)
  • Note diplopia, squint, ptosis, nystagmus
Conjugate deviation:
  • Eyes toward paralytic side = cerebral hemisphere lesion (irritative)
  • Eyes away from paralytic side = cerebral hemisphere lesion (destructive)
  • In pontine lesion: reversed pattern
Specific Nerve Palsies:
NervePalsy Features
CN III (complete)Ptosis, "down and out" eye, dilated pupil, loss of light/accommodation reflex, diplopia
CN IV (trochlear)Impaired downward and outward movement; diplopia on attempted down-gaze
CN VI (abducent)Internal squint; cannot abduct eye; diplopia on lateral gaze
Nystagmus: Involuntary oscillation of eyeball - indicates cerebellar or vestibular apparatus lesion

CN V - Trigeminal Nerve

Motor function:
  • Palpate masseter and temporalis bilaterally as patient clenches teeth
  • Ask patient to open mouth: jaw deviates TOWARD affected side (pterygoid paralysis)
Sensory function:
  • Test all three divisions (ophthalmic V1, maxillary V2, mandibular V3)
  • Light touch, pain (pin), temperature, and vibration over face
  • Also test conjunctiva, nasal mucosa, anterior 2/3 of tongue
Reflexes:
  • Corneal reflex: Touch cornea lightly - blink response (V afferent, VII efferent)
  • Sneezing reflex: Tickle nasal mucosa
  • Both absent in CN V paralysis

CN VII - Facial Nerve

Observation:
  • Nasolabial fold and brow furrows less marked on affected side
  • Angle of mouth drawn to sound side
Motor tests:
  1. Show teeth - angle drawn to healthy side
  2. Puff out cheeks - affected side deflates
  3. Close eyes tightly - examiner tries to open them
  4. Raise eyebrows / wrinkle forehead
UMN vs LMN Facial Palsy:
FeatureUMN (Central)LMN (Peripheral)
Forehead sparingYES - forehead spared (bilateral cortical supply)NO - entire face including forehead affected
CauseStroke, tumor (contralateral)Bell's palsy, parotid tumor, trauma (ipsilateral)
Sensory (chorda tympani - taste):
  • Anterior 2/3 of tongue: assess taste (sweet, salt, sour, bitter)
Stapedius reflex:
  • Loss → hyperacusis (abnormal loudness sensitivity)

CN VIII - Vestibulocochlear Nerve

Hearing (Cochlear):
  • Whispered voice test, finger rub test
  • Rinne test: Tuning fork on mastoid (bone conduction), then external ear (air conduction)
    • Normal and SNHL: AC > BC (Rinne positive)
    • Conductive hearing loss: BC > AC (Rinne negative)
  • Weber test: Tuning fork on vertex
    • Conductive loss: lateralizes to affected ear
    • SNHL: lateralizes to normal ear
Vestibular:
  • Nystagmus (horizontal fast phase away from lesion in vestibular lesions)
  • Romberg test, gait assessment

CN IX & X - Glossopharyngeal & Vagus Nerves

  • Palate elevation: "Say Ahh" - uvula deviates toward healthy side in unilateral palsy
  • Gag reflex: IX = afferent, X = efferent; reduced or absent in lower brainstem lesions
  • Swallowing: Difficulty (dysphagia), nasal regurgitation
  • Voice: Hoarseness (CN X - recurrent laryngeal nerve)
  • Cough reflex: Test with gentle laryngeal palpation

CN XI - Accessory Nerve

  • Sternocleidomastoid: Ask patient to turn head against resistance; paralysed SCM fails to stand out
  • Trapezius: Shrug shoulders against resistance; note asymmetry, winging of scapula

CN XII - Hypoglossal Nerve

  • Ask patient to protrude tongue: tip deviates TOWARD paralysed side
  • Cannot move tongue to opposite side
  • Long-standing: ipsilateral tongue atrophy and fasciculations

4. MOTOR SYSTEM EXAMINATION

Inspection

  • Muscle bulk (wasting, hypertrophy)
  • Fasciculations (LMN disease)
  • Posture and abnormal positions

Muscle Tone

  • Assess by passive movement at each joint
  • Hypotonia (flaccidity): LMN lesion, cerebellar lesion, early acute UMN lesion
  • Spasticity (clasp-knife): UMN lesion; velocity-dependent, releases suddenly
  • Rigidity (lead-pipe): Basal ganglia disease (Parkinsonism)
  • Cogwheel rigidity: Parkinson's disease (tremor superimposed on rigidity)

Muscle Power - MRC Grading Scale

GradeDescription
0No contraction
1Visible/palpable flicker only
2Movement with gravity eliminated
3Movement against gravity only
4Movement against some resistance
5Normal power
Test all major muscle groups systematically (shoulder, elbow, wrist, hip, knee, ankle).

Involuntary Movements

  • Tremor: Resting (Parkinsonism), intention (cerebellum), postural
  • Chorea: Irregular, non-repetitive jerky movements (Huntington's, Sydenham's)
  • Athetosis: Slow, writhing movements (basal ganglia)
  • Tics: Repetitive stereotyped movements (suppressible)
  • Fasciculations: LMN or anterior horn cell disease (ALS)

UMN vs LMN Lesion - Key Comparison

FeatureUMNLMN
ToneIncreased (spastic)Decreased (flaccid)
BulkMild wasting (disuse)Marked wasting
FasciculationsAbsentPresent
Deep reflexesExaggeratedDiminished/absent
Plantar reflexExtensor (Babinski +)Flexor (normal)
DistributionHemiplegia, paraplegiaRoot/nerve territory

5. SENSORY EXAMINATION

Primary (Modality) Sensations

ModalityPathwayTesting Method
Pain (sharp/dull)Spinothalamic (lateral)Pin-prick - compare sides
TemperatureSpinothalamic (lateral)Hot/cold tubes - compare sides
Light touchSpinothalamic + dorsal columnCotton wool - compare sides
VibrationDorsal column (medial lemniscus)128 Hz tuning fork on bony prominences
Joint position sense (proprioception)Dorsal column (medial lemniscus)Move finger/toe up or down with eyes closed

Cortical (Discriminative) Sensations

Require intact primary sensation; if impaired with intact primaries → cortical lesion
  • Stereognosis: Identify objects placed in hand (coin, key, matchbox) with eyes closed
  • Two-point discrimination: Minimum distance to feel two points as separate (normal fingertip: 2-3 mm)
  • Graphesthesia: Identify numbers/letters traced on palm
  • Sensory extinction: Touch both sides simultaneously; cortical lesion → extinction of contralateral stimulus

Sensory Pattern Recognition

PatternLesion
Glove and stockingPeripheral polyneuropathy
Single dermatomeNerve root (radiculopathy)
Hemisensory loss (one side)Contralateral thalamus/cortex
Dissociated loss (pain/temp lost, vibration/proprioception spared)Spinal cord - syringomyelia, anterior cord syndrome
Pain/temp spared, vibration/proprioception lostPosterior column lesion (tabes dorsalis, B12 deficiency)
Suspended sensory level (cape distribution)Syringomyelia
Below a sensory levelComplete/incomplete transverse cord lesion

6. REFLEXES

Deep Tendon Reflexes (DTR) - Grading

GradeResponse
0Absent
1+Present but reduced (hypo)
2+Normal
3+Brisk (possibly abnormal)
4+Hyperreflexia with clonus

Major Reflexes with Root Values

ReflexRootMethod
Biceps jerkC5, C6Tap examiner's thumb on biceps tendon; elbow flexion
Triceps jerkC7Tap just above olecranon, elbow flexed; elbow extension
Brachioradialis (supinator) jerkC5, C6Tap distal radius; wrist/forearm flexion
Knee jerk (patellar)L2, L3, L4Tap ligamentum patellae; quadriceps contraction, leg extension
Ankle jerkS1, S2Tap Achilles tendon with foot dorsiflexed; plantar flexion
Cremasteric reflexT12Stroke inner thigh skin; ipsilateral testis elevates
Abdominal reflexesT7-T11Stroke abdomen parallel to costal margin/iliac crest; umbilicus moves toward stimulus

Reinforcement (Jendrassik Maneuver)

If reflex absent: ask patient to interlock fingers and pull hard just before testing knee jerk.

Special Reflexes

Plantar Reflex (Babinski sign) - S1:
  • Stroke outer sole of foot firmly with blunt object, heel to toe
  • Normal (flexor) response: Downward curling of toes
  • Babinski positive (extensor response): Big toe dorsiflexes (extends), other toes fan out
  • Significance: UMN lesion (corticospinal tract), normal in infants up to 12-18 months
Clonus:
  • Rhythmic oscillations on sustained stretching of a muscle
  • Ankle clonus: dorsiflex foot sharply and sustain - ≥5 beats = pathological UMN
  • Knee clonus: push patella down sharply
Hoffman's Sign (upper limb Babinski equivalent):
  • Flick middle finger nail; positive = thumb flexion/adduction + index finger flexion
  • Indicates cervical myelopathy or UMN lesion
Clonus and hyperreflexia: UMN lesion (pyramidal tract) Absent reflexes + reduced tone: LMN, peripheral neuropathy, acute cerebellar lesion

7. CEREBELLAR EXAMINATION

The cerebellum coordinates voluntary movement, balance, and fine motor control.

Cerebellar Signs - "DANISH" Mnemonic

LetterSign
DDysdiadochokinesia
AAtaxia (gait and limb)
NNystagmus
IIntention tremor
SSlurred (scanning) speech
HHypotonia

Key Tests

Finger-Nose Test:
  • Patient extends arm, then brings index finger to tip of own nose with eyes closed
  • Cerebellar lesion: past-pointing, intention tremor (tremor worsens near target)
Heel-Shin Test:
  • Recumbent patient places heel on opposite knee, then slides down the shin with eyes closed
  • Cerebellar lesion: heel wanders off shin
Dysdiadochokinesia:
  • Rapid alternating movements of pronation/supination of forearm (elbow at 90°)
  • Cerebellar lesion: slow, irregular, clumsy (adiadochokinesia)
Romberg's Test (discriminates cerebellar from posterior column):
  • Patient stands feet together, arms at sides
  • Stage 1: Eyes open - sways in cerebellar lesion
  • Stage 2: Eyes closed
    • Romberg positive (worse on closing eyes): Posterior column/proprioception deficit
    • Romberg negative (unsteady with eyes open too): Cerebellar lesion
  • Cerebellar ataxia is NOT corrected by vision; proprioceptive ataxia IS corrected by vision
Nystagmus:
  • Fast phase beats AWAY from the lesion side in peripheral vestibular lesion
  • Direction-changing nystagmus: central (cerebellar/brainstem) cause
Speech:
  • Scanning/staccato speech: irregular rhythm, explosive syllables
  • Slurred (dysarthria): cerebellar dysfunction
Tandem gait:
  • Walk heel-to-toe on a straight line
  • Falls/deviates toward side of cerebellar lesion

8. GAIT AND STATION

Normal Gait Assessment

Observe: stride length, arm swing, base width, speed, turns

Abnormal Gait Patterns and Their Causes

GaitDescriptionLesion
Hemiplegic (circumduction)Leg swung in arc, arm held flexedContralateral UMN (stroke)
Spastic scissorStiff legs cross each other like scissorsBilateral UMN (cerebral palsy, spinal cord)
Steppage (foot drop)High stepping to clear toesCommon peroneal nerve, L4-L5 radiculopathy
Waddling (Trendelenburg)Hip dips alternately, pelvis tiltsProximal myopathy, gluteal weakness (bilateral)
Ataxic (cerebellar)Wide-based, reeling, irregular stepsCerebellar or brainstem lesion
Sensory ataxiaWide-based, looks at feet, stamps feetPosterior column/proprioceptive loss
ParkinsonianShuffling small steps, bent posture, reduced arm swing, festinationBasal ganglia
AntalgicShortened stance phase on painful sidePain in hip/knee/foot
High-stepping marchingPatient lifts foot high (bilateral)Bilateral foot drop, peripheral polyneuropathy

SPECIAL SIGNS IN CNS EXAMINATION

Meningeal Signs

  • Neck stiffness (nuchal rigidity): Resistance to passive neck flexion - meningitis, SAH
  • Kernig's sign: Flex hip to 90° and attempt knee extension - pain and resistance (>135°) = positive
  • Brudzinski's sign: Passive neck flexion → involuntary hip and knee flexion = positive
  • Both indicate meningeal irritation (meningitis, subarachnoid hemorrhage)

Signs of Raised Intracranial Pressure (ICP)

  • Headache (worse in morning, on bending/straining)
  • Papilledema on fundoscopy
  • Projectile vomiting
  • Cushing's triad: Bradycardia + hypertension + irregular breathing
  • Altered consciousness, CN VI palsy (false localizing sign)

Cortical Level Localization Summary

RegionDeficit
Frontal lobeContralateral motor weakness, Broca's aphasia (dominant), personality change
Temporal lobeWernicke's aphasia (dominant), contralateral upper quadrantanopia
Parietal lobeContralateral sensory loss, neglect (non-dominant), Gerstmann's syndrome (dominant)
Occipital lobeContralateral homonymous hemianopia, visual agnosia
CerebellumIpsilateral ataxia, dysmetria, nystagmus
BrainstemCrossed deficits (ipsilateral CN + contralateral motor/sensory)

SUMMARY TABLE: Key Differentiating Tests

TestNormalAbnormalSignificance
Finger-noseSmooth, accuratePast-pointing, intention tremorCerebellar
RombergStable with eyes closedFalls with eyes closedPosterior column loss
Plantar reflexFlexor (toes curl down)Extensor (Babinski +)UMN lesion
Knee jerk2+ briskAbsent or 4+ with clonusLMN vs UMN
Corneal reflexBlinkAbsentCN V or VII lesion
3-object recall 5 minRecalls all 3Forgets ≥1Short-term memory deficit
Digit span forward≥6 digits<5Attention/delirium
20 WBCTClot formsNon-clottingCoagulopathy

Sources: S. Das - A Manual on Clinical Surgery, 13th Edition; Tintinalli's Emergency Medicine: A Comprehensive Study Guide
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