Snake bite management approach

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Snakebite Management - A Comprehensive Approach

1. Epidemiology & Global Burden

Venomous snakes cause an estimated 1.5-3 million bites per year with over 100,000 deaths globally. The highest burden falls on rural tropical populations - agricultural workers and hunters. In the US, approximately 7,000-8,000 venomous bites occur annually, with mortality now <0.5% (~5 deaths/year) due to antivenom availability. Incidence peaks seasonally (e.g., Russell's viper bites peak during rice harvesting in South Asia).

Tintinalli's Emergency Medicine, p. 2708
Pye's Surgical Handicraft 22e, p. 540

2. Classification of Medically Important Snakes

Family	Examples	Key Venom Effects
Viperidae (vipers/pit vipers)	Russell's viper, saw-scaled viper, puff adder, rattlesnakes, copperhead	Local necrosis, coagulopathy, haemotoxicity, shock
Elapidae	Cobras, kraits, mambas, coral snakes	Neurotoxicity (pre/postsynaptic), minimal local effects
Hydrophiinae (sea snakes)	Sea snakes	Myotoxicity, minimal local pain
Colubridae (rear-fanged)	Boomslang, twig snake	Coagulopathy (less common)

Pye's Surgical Handicraft, Table 28.1

Indian "Big Four": Naja naja (cobra), Bungarus caeruleus (krait), Vipera russelli (Russell's viper), Echis carinatus (saw-scaled viper).

3. Pathophysiology

Viperid venom - complex enzyme mixture causing:

Increased vascular permeability → hypovolaemia
Fibrinogen/platelet consumption → coagulopathy (DIC-like picture)
Phospholipases, proteases, hyaluronidase → local tissue necrosis
Some fractions block neuromuscular transmission (e.g., Mojave rattlesnake)

Elapid venom - primarily neurotoxins:

Pre-synaptic toxins (e.g., beta-bungarotoxin) irreversibly destroy nerve terminals
Post-synaptic toxins (e.g., alpha-cobratoxin) competitively block acetylcholine receptors - potentially reversible with antivenom
Sea snake venom: myotoxicity + myoglobinuria → acute kidney injury (AKI)
Tintinalli's Emergency Medicine, p. 2725
Harrison's Principles of Internal Medicine 22e, p. 1809

4. Clinical Features

4a. Dry Bite

25-50% of all venomous bites result in no envenomation - fang marks present, but no venom injected.

4b. Local Envenomation (mainly Viperidae, some Elapidae)

Pain, swelling within 2 hours - may involve entire limb within days
Bruising, blistering (serous or serosanguinous)
Lymphangitis, tender regional lymph nodes
Tissue necrosis (bites by Russell's viper, puff adder, green mambas)
Krait, sea snake, coral snake bites are virtually painless with minimal local signs

4c. Systemic Envenomation

System	Features
Haematological	Bleeding from fang marks, gums, venepuncture sites; haematemesis, haematuria; non-clottable blood (viper coagulopathy)
Neurological	Ptosis, diplopia, dysphonia, dysphagia → descending flaccid paralysis, respiratory failure (elapids)
Cardiovascular	Hypotension, bradycardia, arrhythmias; shock from vasodilation (bradykinin-releasing venoms)
Renal	AKI - due to haemoglobinuria, myoglobinuria, DIC, direct nephrotoxicity (Russell's viper, sea snakes)
Musculoskeletal	Generalised myolysis with sea snakes/some vipers; rhabdomyolysis

Harrison's 22e, WHO Syndromes table (key syndromes 1-4B)

5. First Aid (Pre-Hospital)

Do:

Keep the patient calm and still; immobilise the bitten limb in a neutral position at heart level
Remove constricting items (rings, watches, tight clothing)
Transport rapidly to hospital
Pressure-immobilisation bandaging (PIB) - ONLY for confirmed elapid (neurotoxic) bites: wrap entire limb firmly (40-70 mmHg), immobilise, carry the patient (do not let them walk)
Photograph the snake from a safe distance for identification

Do NOT do:

Incise or suck the wound - increases tissue damage and infection risk, ineffective
Apply a tourniquet - causes ischaemia and intensifies local necrosis
Apply PIB for viperid bites - increases local necrosis from necrotizing venom
Consult traditional healers or delay hospital care
Harrison's 22e, p. 1786-1788

6. Hospital Management

6a. Initial Assessment (ABCs)

Airway: Early intubation for face/neck bites or impending paralysis
Breathing: Monitor respiratory function; ventilate if neurotoxic paralysis develops
Circulation: Two large-bore IVs (avoid non-compressible sites due to coagulopathy risk); fluid resuscitation with isotonic crystalloid for hypotension
Monitor: vitals, ECG, SpO2, urine output

6b. Key Investigations

Test	Rationale
Whole-blood clotting test (WBCT)	Simple bedside test - 5-10 mL blood in clean glass tube; if unclotted at 20 min → coagulopathy
INR/PT, aPTT, fibrinogen, D-dimer, platelets	Quantify coagulopathy
FBC, U&E, creatinine	AKI screening
Creatine kinase	Myolysis
Urine dipstick	Haematuria, myoglobinuria, haemoglobinuria
Venom detection kit (Australia)	Guides specific antivenom choice

Serial testing should be repeated every 6-12 hours in initially asymptomatic patients.

Goldman-Cecil Medicine, p. 1543

6c. Grading Severity (Crotaline, e.g., for pit vipers)

Grade	Features
0 (Dry bite)	Fang marks only, no systemic signs
I (Mild)	Local swelling only, mild symptoms
II (Moderate)	Systemic symptoms (nausea, dizziness, minor coagulopathy)
III (Severe)	Severe systemic effects, significant coagulopathy, shock

7. Antivenom - The Cornerstone of Treatment

Indications

Antivenom should be given for any evidence of systemic envenomation:

Haematological: non-clottable blood, active bleeding, thrombocytopenia
Neurological: ptosis, paralysis
Cardiovascular: hypotension
Renal: AKI, dark urine (haemoglobinuria/myoglobinuria)
Significant local envenomation progressing rapidly

Key Principles

Monovalent antivenom preferred if offending snake is identified
Polyvalent antivenom used if species unknown
Antivenom neutralizes circulating venom - it cannot reverse established tissue necrosis or replenish already-consumed clotting factors
First developed in 1895 by French scientists; now still the only proven treatment for envenomation
Administer IV, diluted, over 20-30 minutes (one vial initially)
Pre-treatment with adrenaline (epinephrine) - subcutaneous 0.25 mg in adults may reduce anaphylactic reactions (controversial but used in many settings)

Monitoring for Reactions

Early anaphylactoid reactions: urticaria, bronchospasm, hypotension - manage with adrenaline, antihistamines, corticosteroids
Late serum sickness (5-10 days): rash, fever, arthralgia - treat with oral prednisolone + antihistamines
Park's Textbook of Preventive and Social Medicine, p. 3525
Goldman-Cecil Medicine, p. 1548
Harrison's 22e

Cross-protection

Antivenoms rarely provide cross-protection across species unless venoms are homologous. Antivenom must be species-specific. Sea snake envenomation responds to sea snake antivenom; tiger snake antivenom can be used as second-line.

8. Specific Management by Envenomation Type

Viperid Envenomation

Antivenom + fluid resuscitation + treat coagulopathy
For North American pit vipers: CroFab (Fab antivenom) or Anavip (F(ab')2 antivenom) - effective against all US viperid species
Clotting factor replacement (FFP) only for life-threatening bleeding despite antivenom
Do NOT use pressure-immobilisation
Monitor for compartment syndrome; surgical fasciotomy if confirmed (measure compartment pressure)
Dialysis for AKI

Elapid Envenomation (Cobra/Krait)

Pressure-immobilisation first aid (as described above)
Antivenom + anticholinesterase drugs (neostigmine + atropine) - useful for post-synaptic neurotoxins (cobras) - can reverse paralysis. Not effective for pre-synaptic neurotoxins (kraits)
Assisted ventilation (mechanical ventilation) may be required for days to weeks in severe krait/cobra envenomation
Atropine given before neostigmine to prevent bradycardia

Coral Snake (North America)

No antivenom commercially available in the US currently (North American Coral Snake Antivenom discontinued) - supportive care, early intubation

Sea Snake

Sea snake-specific antivenom; tiger snake antivenom as backup
Manage myoglobinuria with IV fluids to prevent AKI

9. Surgical Aspects

Wound debridement: Necrotic tissue must be excised; primary closure is contraindicated (high infection risk)
Fasciotomy: Indicated only for confirmed compartment syndrome (not prophylactically); evidence for this is limited
Skin grafting: May be required after extensive necrosis
Infection: Snake mouths harbour gram-negative organisms; antibiotics (e.g., amoxicillin-clavulanate) are often given, though a 2025 systematic review (PMID: 41287797) found insufficient evidence to support routine antibiotic prophylaxis
Pye's Surgical Handicraft, p. 973

10. Complications

Complication	Mechanism / Cause
AKI	Haemolysis, myolysis, DIC, direct nephrotoxicity (commonest cause of AKI in South Asian hospitals after snakebite)
Respiratory failure	Neurotoxic paralysis (elapids)
Gangrene/limb loss	Local necrosis + secondary infection + tight tourniquets
DIC	Viperid procoagulant venoms consuming fibrinogen/platelets
Hypopituitarism	Russell's viper bite - classic complication due to pituitary infarction (Sheehan-like syndrome)
Secondary infection	Wound contamination, incision first aid

11. WHO Syndromes for SE Asian Snakebite (Diagnostic Aid)

Syndrome	Primary Effect	Additional Effects	Likely Snake
1	Local effects	Coagulopathy/bleeding	Viper
2	Local effects	Coagulopathy + shock/AKI	Russell's viper
3	Local effects	Neurotoxic paralysis	Cobra/King cobra
4	Neurotoxic paralysis	Minimal local effects	Krait (bitten while sleeping)
5	Local effects	Myotoxicity + myoglobinuria	Sea snake/Malayan pit viper

Goldman-Cecil Medicine, p. 1554

12. Prevention

Wear boots and protective clothing in endemic areas
Sleep on raised beds/cots (especially where krait bites occur at night)
Avoid handling snakes; use torches at night outdoors
Community education and access to antivenom in rural health facilities

Recent Evidence (2024-2026)

A 2025 systematic review (PMID: 41287797) found insufficient evidence to support routine antibiotic prophylaxis in snakebite management - review this before prescribing antibiotics reflexively.
A 2026 systematic review and meta-analysis (PMID: 41776424) confirmed AKI is a major complication of snake envenomation, particularly in Southeast Asia, reinforcing the need for serial renal function monitoring.
A 2025 systematic review (PMID: 40691949) on snakebite outcomes in high-incidence Asian countries highlights ongoing gaps in care and need for better access to antivenom.

Sources: Tintinalli's Emergency Medicine, Harrison's Principles 22e, Goldman-Cecil Medicine, Pye's Surgical Handicraft 22e, Park's Textbook of Preventive and Social Medicine

Make it short

Snakebite Management - Quick Reference

Snake Types & Key Effects

Family	Examples	Main Effect
Viperidae	Russell's viper, saw-scaled viper, rattlesnake	Local necrosis + coagulopathy
Elapidae	Cobra, krait, coral snake	Neurotoxicity, paralysis
Sea snakes	Hydrophis spp.	Myotoxicity → AKI

First Aid

Do:

Immobilise limb at heart level, keep patient still
Remove rings/tight clothing
Pressure-immobilisation bandage (PIB) - only for elapid bites
Rush to hospital

Do NOT:

Incise or suck the wound
Apply tourniquet
Use PIB for viper bites (worsens necrosis)

Hospital Management

ABCs First

Airway: early intubation if face/neck bite or paralysis developing
IV access (2 large-bore lines, avoid non-compressible sites)
Fluids for hypotension (isotonic crystalloid)

Investigations

WBCT (20-min clotting test) - bedside coagulopathy screen
INR, fibrinogen, D-dimer, platelets
Creatinine, CK, urine dipstick (blood/myoglobin)
Repeat every 6-12 hrs if initially normal

Antivenom - Core Treatment

Indications: any systemic envenomation - bleeding, paralysis, hypotension, AKI, dark urine

Monovalent preferred if snake identified; polyvalent if unknown
Give IV, diluted, over 20-30 minutes
Does NOT reverse established necrosis or replenish consumed clotting factors
Watch for anaphylaxis; treat with adrenaline + antihistamines

Envenomation-Specific Points

Type	Specific Treatment
Viper	Antivenom + fluids; FFP only for life-threatening bleeding; fasciotomy only if compartment syndrome confirmed
Cobra	Antivenom + neostigmine/atropine (post-synaptic reversal); ventilate if needed
Krait	Antivenom + mechanical ventilation; neostigmine often ineffective (pre-synaptic)
Sea snake	Sea snake antivenom (tiger snake antivenom as backup); IV fluids for myoglobinuria

Key Complications

AKI (commonest in South Asia - Russell's viper, sea snakes)
Respiratory failure (elapid paralysis)
DIC (viperid coagulopathy)
Gangrene (necrosis + tight tourniquets)
Hypopituitarism (Russell's viper - classic)

Remember

25-50% of venomous bites are dry bites - observe all patients for 12-24 hrs
Antivenom is the only proven treatment for systemic envenomation
Routine antibiotics are not supported by current evidence (2025 systematic review, PMID 41287797)

Create a quick reference PDF for snakebite management

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mkdir -p /tmp/workspace/snakebite-pdf && python3 << 'EOF' from reportlab.lib.pagesizes import A4 from reportlab.lib import colors from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle from reportlab.lib.units import cm, mm from reportlab.platypus import (SimpleDocTemplate, Paragraph, Spacer, Table, TableStyle, HRFlowable, KeepTogether) from reportlab.lib.enums import TA_CENTER, TA_LEFT, TA_JUSTIFY from reportlab.platypus import PageBreak OUTPUT = "/tmp/workspace/snakebite-pdf/Snakebite_Quick_Reference.pdf" doc = SimpleDocTemplate( OUTPUT, pagesize=A4, rightMargin=1.5*cm, leftMargin=1.5*cm, topMargin=1.8*cm, bottomMargin=1.5*cm, title="Snakebite Management Quick Reference", author="Orris Medical Library" ) # ── Colour palette ────────────────────────────────────────────── RED = colors.HexColor("#C0392B") DARK_RED = colors.HexColor("#922B21") ORANGE = colors.HexColor("#E67E22") GREEN = colors.HexColor("#1E8449") DARK_BLUE = colors.HexColor("#1A5276") MID_BLUE = colors.HexColor("#2874A6") LIGHT_BLUE= colors.HexColor("#D6EAF8") LIGHT_RED = colors.HexColor("#FADBD8") LIGHT_GRN = colors.HexColor("#D5F5E3") LIGHT_ORG = colors.HexColor("#FDEBD0") GREY_BG = colors.HexColor("#F2F3F4") WHITE = colors.white BLACK = colors.HexColor("#1C1C1C") MID_GREY = colors.HexColor("#7F8C8D") # ── Styles ─────────────────────────────────────────────────────── styles = getSampleStyleSheet() def S(name, **kw): return ParagraphStyle(name, **kw) title_style = S("Title2", fontSize=20, textColor=WHITE, alignment=TA_CENTER, fontName="Helvetica-Bold", spaceAfter=2) subtitle_style = S("Sub", fontSize=9, textColor=colors.HexColor("#ABEBC6"), alignment=TA_CENTER, fontName="Helvetica") sec_head = S("SecHead", fontSize=11, textColor=WHITE, fontName="Helvetica-Bold", alignment=TA_LEFT, spaceAfter=0, spaceBefore=0, leftIndent=6, leading=16) body = S("Body2", fontSize=8.2, textColor=BLACK, fontName="Helvetica", leading=12, spaceAfter=3, leftIndent=4) bold_body = S("BoldBody", fontSize=8.2, textColor=BLACK, fontName="Helvetica-Bold", leading=12, spaceAfter=3, leftIndent=4) small = S("Small", fontSize=7.5, textColor=MID_GREY, fontName="Helvetica", leading=10, spaceAfter=2, leftIndent=4) bullet = S("Bullet2", fontSize=8.2, textColor=BLACK, fontName="Helvetica", leading=12, spaceAfter=2, leftIndent=14, bulletIndent=4, bulletText="•") do_style = S("Do", fontSize=8.2, textColor=GREEN, fontName="Helvetica-Bold", leading=11, spaceAfter=2, leftIndent=14, bulletIndent=4) donot_style = S("Donot", fontSize=8.2, textColor=RED, fontName="Helvetica-Bold", leading=11, spaceAfter=2, leftIndent=14, bulletIndent=4) table_header = S("TH", fontSize=8, textColor=WHITE, fontName="Helvetica-Bold", alignment=TA_CENTER, leading=10) table_cell = S("TC", fontSize=7.8, textColor=BLACK, fontName="Helvetica", alignment=TA_LEFT, leading=10) table_cell_c = S("TCC", fontSize=7.8, textColor=BLACK, fontName="Helvetica", alignment=TA_CENTER, leading=10) # ── Helper: coloured section header ───────────────────────────── def section(title, bg=DARK_BLUE): tbl = Table([[Paragraph(f"▌ {title}", sec_head)]], colWidths=[18*cm]) tbl.setStyle(TableStyle([ ("BACKGROUND", (0,0), (-1,-1), bg), ("ROWPADDING", (0,0), (-1,-1), 4), ("TOPPADDING", (0,0), (-1,-1), 3), ("BOTTOMPADDING",(0,0),(-1,-1), 3), ("BOX", (0,0), (-1,-1), 0, bg), ])) return tbl def spacer(h=0.18*cm): return Spacer(1, h) # ── Content ────────────────────────────────────────────────────── story = [] # ─ Title Banner ─ title_tbl = Table( [[Paragraph("SNAKEBITE MANAGEMENT", title_style)], [Paragraph("Quick Reference Card | Emergency & Clinical Use", subtitle_style)]], colWidths=[18*cm] ) title_tbl.setStyle(TableStyle([ ("BACKGROUND", (0,0), (-1,-1), DARK_RED), ("ROWPADDING", (0,0), (-1,-1), 4), ("TOPPADDING", (0,0), (0,0), 10), ("BOTTOMPADDING", (0,1), (0,1), 10), ])) story.append(title_tbl) story.append(spacer(0.3*cm)) # ─ Two-column layout helper ─ def two_col(left_items, right_items, lw=8.8*cm, rw=8.8*cm): left = [i for i in left_items] right = [i for i in right_items] # pad to same length while len(left) < len(right): left.append(Spacer(1,1)) while len(right) < len(left): right.append(Spacer(1,1)) rows = [[l, r] for l, r in zip(left, right)] t = Table(rows, colWidths=[lw, 0.4*cm, rw]) t.setStyle(TableStyle([ ("VALIGN", (0,0), (-1,-1), "TOP"), ("LEFTPADDING", (0,0),(-1,-1), 0), ("RIGHTPADDING", (0,0),(-1,-1), 0), ("TOPPADDING", (0,0),(-1,-1), 0), ("BOTTOMPADDING",(0,0),(-1,-1), 0), ])) return t # ════════════════════════════════════════════ # SECTION 1 – Snake Types # ════════════════════════════════════════════ story.append(section("1. SNAKE TYPES & VENOM EFFECTS", DARK_BLUE)) story.append(spacer()) snake_data = [ [Paragraph("Family", table_header), Paragraph("Examples", table_header), Paragraph("Key Effect", table_header)], [Paragraph("Viperidae", table_cell), Paragraph("Russell's viper, saw-scaled viper,\nrattlesnake, copperhead", table_cell), Paragraph("Local necrosis, coagulopathy, haemotoxicity, shock", table_cell)], [Paragraph("Elapidae", table_cell), Paragraph("Cobra, krait, mamba, coral snake", table_cell), Paragraph("Neurotoxicity → descending paralysis, resp. failure", table_cell)], [Paragraph("Sea snakes", table_cell), Paragraph("Hydrophis spp.", table_cell), Paragraph("Myotoxicity → myoglobinuria → AKI", table_cell)], ] st = Table(snake_data, colWidths=[3.5*cm, 6.5*cm, 8*cm]) st.setStyle(TableStyle([ ("BACKGROUND", (0,0), (-1,0), DARK_BLUE), ("BACKGROUND", (0,1), (-1,1), LIGHT_BLUE), ("BACKGROUND", (0,2), (-1,2), WHITE), ("BACKGROUND", (0,3), (-1,3), LIGHT_BLUE), ("GRID", (0,0), (-1,-1), 0.4, colors.HexColor("#AED6F1")), ("VALIGN", (0,0), (-1,-1), "MIDDLE"), ("TOPPADDING", (0,0), (-1,-1), 4), ("BOTTOMPADDING", (0,0), (-1,-1), 4), ("LEFTPADDING", (0,0), (-1,-1), 5), ])) story.append(st) story.append(spacer(0.15*cm)) story.append(Paragraph( "Indian Big Four: Naja naja (cobra) · Bungarus caeruleus (krait) · " "Vipera russelli (Russell's viper) · Echis carinatus (saw-scaled viper)", small)) story.append(Paragraph( "Dry bite: 25–50 % of venomous bites — no venom injected. Observe ALL patients ≥12 h.", small)) story.append(spacer(0.25*cm)) # ════════════════════════════════════════════ # SECTION 2 – First Aid # ════════════════════════════════════════════ story.append(section("2. FIRST AID (Pre-Hospital)", GREEN)) story.append(spacer()) do_col = [ Paragraph("DO", S("HDo", fontSize=9, textColor=GREEN, fontName="Helvetica-Bold", spaceAfter=3, leftIndent=4)), Paragraph("✔ Immobilise limb at heart level; keep patient still", body), Paragraph("✔ Remove rings, watches, tight clothing", body), Paragraph("✔ Pressure-immobilisation bandage (PIB) — ONLY for confirmed elapid (neurotoxic) bites; wrap entire limb firmly (40–70 mmHg), then carry the patient", body), Paragraph("✔ Transport rapidly to hospital", body), Paragraph("✔ Photograph snake from a safe distance for ID", body), ] dont_col = [ Paragraph("DO NOT", S("HDont", fontSize=9, textColor=RED, fontName="Helvetica-Bold", spaceAfter=3, leftIndent=4)), Paragraph("✘ Incise or suck the wound", body), Paragraph("✘ Apply a tourniquet", body), Paragraph("✘ Use PIB for viper bites (worsens necrosis)", body), Paragraph("✘ Let the patient walk (muscle pumping disperses venom)", body), Paragraph("✘ Consult traditional healers or delay hospital care", body), ] fa_bg_do = colors.HexColor("#EAFAF1") fa_bg_dont = colors.HexColor("#FDEDEC") do_tbl = Table([[item] for item in do_col], colWidths=[8.6*cm]) do_tbl.setStyle(TableStyle([ ("BACKGROUND", (0,0),(-1,-1), fa_bg_do), ("BOX", (0,0),(-1,-1), 0.8, GREEN), ("TOPPADDING", (0,0),(-1,-1), 2), ("BOTTOMPADDING", (0,0),(-1,-1), 2), ("LEFTPADDING", (0,0),(-1,-1), 5), ])) dont_tbl = Table([[item] for item in dont_col], colWidths=[8.6*cm]) dont_tbl.setStyle(TableStyle([ ("BACKGROUND", (0,0),(-1,-1), fa_bg_dont), ("BOX", (0,0),(-1,-1), 0.8, RED), ("TOPPADDING", (0,0),(-1,-1), 2), ("BOTTOMPADDING", (0,0),(-1,-1), 2), ("LEFTPADDING", (0,0),(-1,-1), 5), ])) fa_outer = Table([[do_tbl, Spacer(0.4*cm,1), dont_tbl]], colWidths=[8.6*cm, 0.4*cm, 8.6*cm]) fa_outer.setStyle(TableStyle([("VALIGN",(0,0),(-1,-1),"TOP")])) story.append(fa_outer) story.append(spacer(0.25*cm)) # ════════════════════════════════════════════ # SECTION 3 – Hospital Management # ════════════════════════════════════════════ story.append(section("3. HOSPITAL MANAGEMENT", MID_BLUE)) story.append(spacer()) # 3a ABCs abc_data = [ [Paragraph("ABCs", table_header), Paragraph("Action", table_header)], [Paragraph("Airway", table_cell), Paragraph("Early intubation for face/neck bite or impending paralysis", table_cell)], [Paragraph("Breathing", table_cell), Paragraph("Monitor SpO₂; mechanical ventilation for neurotoxic paralysis", table_cell)], [Paragraph("Circulation", table_cell), Paragraph("2 large-bore IVs (avoid non-compressible sites); isotonic crystalloid for hypotension", table_cell)], [Paragraph("Monitor", table_cell), Paragraph("Vitals · ECG · SpO₂ · urine output · limb circumference hourly", table_cell)], ] abc_tbl = Table(abc_data, colWidths=[3*cm, 15*cm]) abc_tbl.setStyle(TableStyle([ ("BACKGROUND", (0,0),(-1,0), MID_BLUE), ("BACKGROUND", (0,1),(-1,1), LIGHT_BLUE), ("BACKGROUND", (0,2),(-1,2), WHITE), ("BACKGROUND", (0,3),(-1,3), LIGHT_BLUE), ("BACKGROUND", (0,4),(-1,4), WHITE), ("GRID", (0,0),(-1,-1), 0.4, colors.HexColor("#AED6F1")), ("VALIGN", (0,0),(-1,-1), "MIDDLE"), ("TOPPADDING", (0,0),(-1,-1), 4), ("BOTTOMPADDING", (0,0),(-1,-1), 4), ("LEFTPADDING", (0,0),(-1,-1), 5), ])) story.append(abc_tbl) story.append(spacer(0.2*cm)) # 3b Investigations inv_data = [ [Paragraph("Test", table_header), Paragraph("Purpose", table_header)], [Paragraph("WBCT (20-min whole-blood clotting test)", table_cell), Paragraph("Bedside coagulopathy screen — unclotted blood = coagulopathy", table_cell)], [Paragraph("INR, aPTT, fibrinogen, D-dimer, platelets", table_cell), Paragraph("Quantify DIC/coagulopathy", table_cell)], [Paragraph("Urea, creatinine, electrolytes", table_cell), Paragraph("AKI detection", table_cell)], [Paragraph("CK", table_cell), Paragraph("Myolysis (sea snakes, some vipers)", table_cell)], [Paragraph("Urine dipstick", table_cell), Paragraph("Haematuria · haemoglobinuria · myoglobinuria", table_cell)], ] inv_hdr = Paragraph("KEY INVESTIGATIONS — repeat every 6–12 h if initially normal", S("IH", fontSize=8.5, textColor=MID_BLUE, fontName="Helvetica-Bold", spaceAfter=3, leftIndent=4)) story.append(inv_hdr) inv_tbl = Table(inv_data, colWidths=[6.5*cm, 11.5*cm]) inv_tbl.setStyle(TableStyle([ ("BACKGROUND", (0,0),(-1,0), MID_BLUE), ("ROWBACKGROUNDS",(0,1),(-1,-1), [LIGHT_BLUE, WHITE]), ("GRID", (0,0),(-1,-1), 0.4, colors.HexColor("#AED6F1")), ("VALIGN", (0,0),(-1,-1), "MIDDLE"), ("TOPPADDING", (0,0),(-1,-1), 4), ("BOTTOMPADDING", (0,0),(-1,-1), 4), ("LEFTPADDING", (0,0),(-1,-1), 5), ])) story.append(inv_tbl) story.append(spacer(0.25*cm)) # ════════════════════════════════════════════ # SECTION 4 – Antivenom # ════════════════════════════════════════════ story.append(section("4. ANTIVENOM", DARK_RED)) story.append(spacer()) av_ind = [ Paragraph("Indications — any of:", bold_body), Paragraph("• Non-clottable blood / active bleeding / thrombocytopenia", body), Paragraph("• Ptosis, diplopia, or descending paralysis", body), Paragraph("• Hypotension / shock", body), Paragraph("• AKI or dark urine (haemoglobin / myoglobin)", body), Paragraph("• Rapidly progressing local swelling", body), ] av_notes = [ Paragraph("Administration", bold_body), Paragraph("Monovalent (if species known) or polyvalent", body), Paragraph("Dilute in saline; infuse IV over 20–30 min", body), Paragraph("Pre-treat: adrenaline 0.25 mg SC (adult)", body), Paragraph("Limitations", bold_body), Paragraph("Does NOT reverse established necrosis or replenish consumed clotting factors", body), ] av_ind_tbl = Table([[item] for item in av_ind], colWidths=[8.6*cm]) av_ind_tbl.setStyle(TableStyle([ ("BACKGROUND", (0,0),(-1,-1), LIGHT_RED), ("BOX", (0,0),(-1,-1), 0.8, DARK_RED), ("TOPPADDING", (0,0),(-1,-1), 2), ("BOTTOMPADDING",(0,0),(-1,-1),2), ("LEFTPADDING", (0,0),(-1,-1), 5), ])) av_notes_tbl = Table([[item] for item in av_notes], colWidths=[8.6*cm]) av_notes_tbl.setStyle(TableStyle([ ("BACKGROUND", (0,0),(-1,-1), LIGHT_ORG), ("BOX", (0,0),(-1,-1), 0.8, ORANGE), ("TOPPADDING", (0,0),(-1,-1), 2), ("BOTTOMPADDING",(0,0),(-1,-1),2), ("LEFTPADDING", (0,0),(-1,-1), 5), ])) av_outer = Table([[av_ind_tbl, Spacer(0.4*cm,1), av_notes_tbl]], colWidths=[8.6*cm, 0.4*cm, 8.6*cm]) av_outer.setStyle(TableStyle([("VALIGN",(0,0),(-1,-1),"TOP")])) story.append(av_outer) story.append(spacer(0.15*cm)) story.append(Paragraph( "Reaction management: Anaphylaxis → adrenaline + antihistamine + corticosteroids | " "Serum sickness (5–10 days later) → oral prednisolone + antihistamine", small)) story.append(spacer(0.25*cm)) # ════════════════════════════════════════════ # SECTION 5 – Envenomation-Specific # ════════════════════════════════════════════ story.append(section("5. ENVENOMATION-SPECIFIC TREATMENT", colors.HexColor("#6C3483"))) story.append(spacer()) spec_data = [ [Paragraph("Type", table_header), Paragraph("Specific Management", table_header)], [Paragraph("Viper\n(Viperidae)", table_cell), Paragraph("Antivenom + IV fluids · FFP only for life-threatening bleeding despite antivenom · " "Fasciotomy ONLY if compartment syndrome confirmed · Dialysis for AKI · " "Do NOT use PIB", table_cell)], [Paragraph("Cobra\n(post-synaptic)", table_cell), Paragraph("Antivenom + neostigmine (0.04 mg/kg IV) with atropine (0.6 mg IV first) — " "may reverse paralysis · Ventilate if needed", table_cell)], [Paragraph("Krait\n(pre-synaptic)", table_cell), Paragraph("Antivenom + mechanical ventilation (may need days–weeks) · " "Neostigmine often ineffective (pre-synaptic toxin irreversible)", table_cell)], [Paragraph("Sea snake", table_cell), Paragraph("Sea snake-specific antivenom (tiger snake antivenom if unavailable) · " "IV fluids to protect kidneys from myoglobinuria · Dialysis if AKI", table_cell)], [Paragraph("Coral snake\n(N. America)", table_cell), Paragraph("Supportive care · Early prophylactic intubation · " "No commercial antivenom currently available in USA", table_cell)], ] spec_tbl = Table(spec_data, colWidths=[2.8*cm, 15.2*cm]) spec_tbl.setStyle(TableStyle([ ("BACKGROUND", (0,0),(-1,0), colors.HexColor("#6C3483")), ("ROWBACKGROUNDS",(0,1),(-1,-1), [colors.HexColor("#F5EEF8"), WHITE]), ("GRID", (0,0),(-1,-1), 0.4, colors.HexColor("#D2B4DE")), ("VALIGN", (0,0),(-1,-1), "MIDDLE"), ("TOPPADDING", (0,0),(-1,-1), 4), ("BOTTOMPADDING", (0,0),(-1,-1), 4), ("LEFTPADDING", (0,0),(-1,-1), 5), ])) story.append(spec_tbl) story.append(spacer(0.25*cm)) # ════════════════════════════════════════════ # SECTION 6 – Complications + WHO Syndromes # ════════════════════════════════════════════ comp_items = [ section("6. KEY COMPLICATIONS", colors.HexColor("#117A65")), spacer(), ] comp_data = [ [Paragraph("Complication", table_header), Paragraph("Cause / Note", table_header)], [Paragraph("AKI", table_cell), Paragraph("Haemolysis, myolysis, DIC, direct nephrotoxicity (most common in S. Asia)", table_cell)], [Paragraph("Respiratory failure", table_cell), Paragraph("Elapid neurotoxic paralysis — may need ventilation for weeks", table_cell)], [Paragraph("DIC", table_cell), Paragraph("Viperid procoagulant venoms consuming fibrinogen + platelets", table_cell)], [Paragraph("Gangrene / limb loss", table_cell), Paragraph("Local necrosis + infection + tight tourniquets applied as first aid", table_cell)], [Paragraph("Hypopituitarism", table_cell), Paragraph("Russell's viper — classic Sheehan-like pituitary infarction", table_cell)], ] comp_tbl = Table(comp_data, colWidths=[3.8*cm, 14.2*cm]) comp_tbl.setStyle(TableStyle([ ("BACKGROUND", (0,0),(-1,0), colors.HexColor("#117A65")), ("ROWBACKGROUNDS",(0,1),(-1,-1), [LIGHT_GRN, WHITE]), ("GRID", (0,0),(-1,-1), 0.4, colors.HexColor("#A9DFBF")), ("VALIGN", (0,0),(-1,-1), "MIDDLE"), ("TOPPADDING", (0,0),(-1,-1), 4), ("BOTTOMPADDING", (0,0),(-1,-1), 4), ("LEFTPADDING", (0,0),(-1,-1), 5), ])) comp_items += [comp_tbl, spacer(0.25*cm)] who_items = [ section("7. WHO SYNDROMES — SE ASIAN SNAKEBITE", colors.HexColor("#784212")), spacer(), ] who_data = [ [Paragraph("Syndrome", table_header), Paragraph("Primary Effect", table_header), Paragraph("Additional Effects", table_header), Paragraph("Likely Snake", table_header)], [Paragraph("1", table_cell_c), Paragraph("Local effects", table_cell), Paragraph("Coagulopathy / bleeding", table_cell), Paragraph("Viper", table_cell)], [Paragraph("2", table_cell_c), Paragraph("Local effects", table_cell), Paragraph("Coagulopathy + shock or AKI", table_cell), Paragraph("Russell's viper", table_cell)], [Paragraph("3", table_cell_c), Paragraph("Local effects", table_cell), Paragraph("Neurotoxic paralysis", table_cell), Paragraph("Cobra / King cobra", table_cell)], [Paragraph("4", table_cell_c), Paragraph("Neurotoxic paralysis", table_cell), Paragraph("Minimal/no local effects; bitten while sleeping", table_cell), Paragraph("Krait", table_cell)], [Paragraph("5", table_cell_c), Paragraph("Local effects", table_cell), Paragraph("Myotoxicity + myoglobinuria + AKI", table_cell), Paragraph("Sea snake / Malayan pit viper", table_cell)], ] who_bg = colors.HexColor("#784212") who_tbl = Table(who_data, colWidths=[1.8*cm, 3.8*cm, 7.2*cm, 5.2*cm]) who_tbl.setStyle(TableStyle([ ("BACKGROUND", (0,0),(-1,0), who_bg), ("ROWBACKGROUNDS",(0,1),(-1,-1), [colors.HexColor("#FEF9E7"), WHITE]), ("GRID", (0,0),(-1,-1), 0.4, colors.HexColor("#FAD7A0")), ("VALIGN", (0,0),(-1,-1), "MIDDLE"), ("TOPPADDING", (0,0),(-1,-1), 4), ("BOTTOMPADDING", (0,0),(-1,-1), 4), ("LEFTPADDING", (0,0),(-1,-1), 5), ])) who_items += [who_tbl, spacer(0.25*cm)] # put sections 6 & 7 as continuous flow for item in comp_items + who_items: story.append(item) # ── Footer note ────────────────────────────────────────────────── story.append(HRFlowable(width="100%", thickness=0.5, color=MID_GREY)) story.append(spacer(0.1*cm)) story.append(Paragraph( "Sources: Harrison's Principles of Internal Medicine 22e · Tintinalli's Emergency Medicine · " "Goldman-Cecil Medicine · Pye's Surgical Handicraft 22e · Park's Textbook of Preventive & Social Medicine | " "Evidence: Antimicrobial prophylaxis not routinely recommended (Moody et al., Wellcome Open Res 2025, PMID 41287797)", S("Foot", fontSize=6.8, textColor=MID_GREY, fontName="Helvetica", leading=9, alignment=TA_LEFT))) # ── Build ───────────────────────────────────────────────────────── doc.build(story) print("PDF created:", OUTPUT) EOF

Your quick reference PDF is ready:

Snakebite Quick Reference

PDF Document · PDF

What's included in the PDF:

Snake Types & Venom Effects - colour-coded table covering Viperidae, Elapidae, and sea snakes, plus the Indian Big Four
First Aid - side-by-side DO / DO NOT boxes in green and red
Hospital Management - ABC table + key investigations with repeat intervals
Antivenom - indications, dosing, limitations, and reaction management
Envenomation-Specific Treatment - viper, cobra, krait, sea snake, coral snake
Key Complications - AKI, DIC, respiratory failure, gangrene, hypopituitarism
WHO SE Asian Snakebite Syndromes - diagnostic classification table

Formatted as a single A4 page with colour-coded sections for quick scanning at the bedside. Sources cited in the footer.

Can u tell the snake bite approach in simple and short

Snakebite Approach — Simple & Short

Step 1 — First Aid (At the Scene)

Keep calm, don't move the bitten limb
Remove rings/tight clothing
Go to hospital immediately
❌ No cutting, sucking, or tourniquet

Step 2 — Is it Envenomed?

25–50% of bites = dry bite (no venom). Look for:

Local swelling, bleeding from fang marks → Viper
Drooping eyelids, weakness → Cobra/Krait
Dark urine, muscle pain → Sea snake

Step 3 — Hospital: Quick Checks

ABC (airway, breathing, circulation)
WBCT test — put blood in a glass tube, wait 20 min. If unclotted → viper bite with coagulopathy
Bloods: clotting, kidney function, urine dipstick

Step 4 — Antivenom (Main Treatment)

Give if any: bleeding, paralysis, shock, kidney failure, or dark urine

Give IV, diluted, over 20–30 min
Monovalent (if snake known) or polyvalent

Step 5 — Type-Specific

Snake	Extra Treatment
Viper	Fluids, antivenom, dialysis if needed
Cobra	Antivenom + neostigmine/atropine
Krait	Antivenom + ventilator (paralysis)
Sea snake	Antivenom + IV fluids

Key Points to Remember

Observe all patients for at least 12 hours
No antibiotics routinely needed
Antivenom doesn't reverse necrosis — give it early
Russell's viper can cause kidney failure + pituitary damage

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