Russell Viper (Daboia russelii / D. siamensis) Snakebite

1. Distinguishing the Russell Viper Bite

The Snake's Appearance

Fang Mark Pattern

• Two prominent fang punctures separated by 1-4 cm (large snake = wider gap)
• Surrounded by immediate local bruising, oozing, and swelling within minutes
• Fang marks may be deep and bleed actively

Distinguishing Russell Viper vs. Other Snakes

Wound at Presentation

• Early (first few hours): two fang marks, local redness, swelling, hemorrhagic blister formation - the characteristic blue-purple discoloration
• Later: skin and soft tissue necrosis, extensive ecchymosis spreading proximally
• Systemic: bleeding from venipuncture sites, haematuria, haemoptysis (coagulopathy)

20-Minute Whole Blood Clotting Test (20WBCT)

2. Basic (General) Management

Pre-Hospital / First Aid

• Do NOT apply tourniquets (worsen ischaemia and necrosis)
• Do NOT cut and suck the wound
• Do NOT apply electric shock (proven ineffective)
• Immobilize the bitten limb below heart level (pressure immobilization is not recommended for viper bites - only for neurotoxic elapids)
• Remove rings, bangles, tight clothing from bitten limb
• Reassure and calm the patient; carry to hospital (do not let the patient walk)
• If possible, photograph the snake - do not handle it

Hospital Assessment

1. Detailed history: time of bite, snake description, symptoms
2. Vitals: BP, HR, RR, SpO2, urine output (hourly)
3. Local examination: fang marks, extent of swelling (mark margins with pen and time), blister formation, necrosis
4. Baseline investigations:
   • 20WBCT (bedside)
   • PT/INR, aPTT, fibrinogen, FDPs/D-dimer
   • Full blood count, peripheral smear
   • Blood urea, serum creatinine, electrolytes
   • Urinalysis (haematuria, proteinuria, casts)
   • Group and cross-match
   • ECG

Monitoring

• Serial 20WBCT every 6 hours for 24 hours
• Limb circumference or girth measurements
• Urine output (target >0.5 mL/kg/hour)
• Watch for compartment syndrome (rare in viper bites but possible)

Supportive Care

• IV access with large-bore cannula
• IV fluids for shock or hypovolaemia
• Blood transfusion for significant haemorrhage
• Fresh frozen plasma / cryoprecipitate for coagulopathy only if antivenom has already been given (do NOT give FFP before antivenom - it will simply be consumed; evidence shows FFP without antivenom does not correct coagulopathy in Russell viper envenomation)
• Dialysis for acute kidney injury
• Wound care: keep clean, debride necrotic tissue, skin grafting may be needed
• No prophylactic antibiotics routinely (amoxicillin-clavulanate is not effective in preventing secondary infection)

3. Pharmacological Management

Antivenom - Mainstay of Treatment

• Abnormal 20WBCT (unclotted blood = coagulopathy)
• Active bleeding (haemoptysis, haematuria, bleeding from gums, IV sites)
• Neurotoxic signs (ptosis, ophthalmoplegia - less common with Russell viper)
• Shock / hypotension
• Acute kidney injury
• Significant local swelling (>50% of the bitten limb within 48 hours)
• Haemoglobin <8 g/dL or WBC >20,000 or platelets <100,000 due to envenomation

• Initial dose: 10 vials (in India: each 10 mL vial neutralises ~6 mg venom)
• Dilute in 250-500 mL normal saline, infuse over 30-60 minutes
• Repeat 6-hourly if coagulopathy persists (20WBCT remains abnormal)
• No fixed maximum dose - treat until endpoints are met
• Children receive the same dose as adults (venom dose depends on snake, not victim size)

• 20WBCT normalises (within 6 hours of adequate antivenom)
• Bleeding stops
• Swelling progression halts

• Subcutaneous epinephrine (adrenaline) 0.25 mL of 1:1000 (adult dose), SC, 15-30 min before infusion
• Chlorpheniramine (H1 antihistamine) IV or IM
• Ranitidine or promethazine (some centres)
• Corticosteroids (hydrocortisone) - used in many centres but evidence is weak

• Stop infusion immediately
• Epinephrine 0.5 mg IM (for anaphylaxis)
• H1 + H2 antihistamines IV (diphenhydramine 25-50 mg + ranitidine 25-50 mg IV)
• Restart at slower rate once reaction resolves
• Skin testing is no longer recommended (dangerous and unreliable)

Other Pharmacological Agents

What NOT to Do (Harmful Treatments)

• Tourniquets - cause limb ischaemia, increase necrosis
• Incision and suction - ineffective, increases infection risk
• Electric shock - proven ineffective in animal studies
• Traditional herbal remedies / black stones - delay effective treatment
• FFP before antivenom - consumed by ongoing venom activity
• Prophylactic antibiotics - not effective

4. Special Complications Unique to Russell Viper

1. Acute Kidney Injury (AKI): Direct nephrotoxicity from venom; most common cause of AKI from snakebite in Myanmar (>70% of cases). Manage as standard AKI; early antivenom is critical.
2. Anterior Pituitary Infarction (Sheehan-like): Hypopituitarism from anterior pituitary infarction; may present acutely or delayed (months-years later with features of pan-hypopituitarism). Unique to Russell viper.
3. Capillary Leak Syndrome: Severe oedema, hypovolaemic shock.
4. VICC (Venom-Induced Consumptive Coagulopathy): Fibrinogen depletion, elevated PT/INR, low platelets.
5. Local Necrosis: Often extensive; requires wound care and skin grafting.

• Goldman-Cecil Medicine, International Ed. - Chapter 98 (Envenomation)
• Fitzpatrick's Dermatology, Vol. 1-2 - Chapter 182
• Brenner & Rector's The Kidney - Renal failure after snakebite

Note: No recent (2023-2026) systematic reviews on Russell viper antivenom were identified on PubMed. Current guidelines are primarily from the WHO and regional health ministries (India's NVBDCP). The core management principles above are consistent with WHO 2016 snakebite guidelines.

Russell Viper Snakebite - Comprehensive Clinical Overview

1. Definition

2. Etiology

The Causative Agent

• Species: Daboia russelii (South Asia) and D. siamensis (Southeast/East Asia)
• Family: Viperidae (true vipers, non-pit)
• Also called: Chain viper, Daboia, "The Big Four" (India - alongside common cobra, common krait, saw-scaled viper)

Risk Factors / Predisposing Conditions

Venom Composition - The Etiological Basis of All Pathology

1. Serine proteases - activate prothrombin, fibrinogen-cleaving activity → VICC
2. Metalloproteinases (hemorrhagins) - damage vascular endothelium → hemorrhage, local necrosis
3. Phospholipase A₂ (PLA₂) - disrupts cell membranes → myonecrosis, nephrotoxicity, inflammation
4. Factor V activator, Factor X activator - directly activate coagulation cascade → DIC-like consumptive coagulopathy
5. Disintegrins / C-type lectin-like proteins - impair platelet aggregation / function → thrombocytopenia
6. Hyaluronidase ("spreading factor") - breaks down connective tissue → facilitates venom spread into tissues
7. L-amino acid oxidase - generates H₂O₂, causes oxidative tissue damage
8. Venom collagenase - degrades collagen in vessel walls → hemorrhage and tissue loss
9. Direct nephrotoxins - cause tubular necrosis independent of hemodynamic effects
10. (Some subspecies) Neurotoxins - presynaptic phospholipase neurotoxins → ptosis, ophthalmoplegia

3. Pathophysiology

A. Local Tissue Injury

Venom injected subcutaneously/intramuscularly
        ↓
Metalloproteinases + PLA₂ + hyaluronidase
        ↓
Capillary endothelial disruption + cell membrane lysis
        ↓
Massive local inflammation, oedema, haemorrhagic blistering
        ↓
Progressive ischaemia and necrosis of skin, subcutaneous tissue, muscle
        ↓
Full-thickness necrosis (days 3-7) requiring debridement/grafting

B. Venom-Induced Consumptive Coagulopathy (VICC) - Hallmark

Factor V/X activators + serine proteases + thrombin-like enzymes
        ↓
Massive consumption of fibrinogen, platelets, and clotting factors
        ↓
Non-clotting blood (positive 20WBCT), prolonged PT/INR/aPTT
        ↓
Spontaneous bleeding: haematuria, haemoptysis, gum bleeding, 
wound ooze, intracranial haemorrhage (most feared)
        ↓
Disintegrins + C-type lectin proteins → thrombocytopenia (impaired 
platelet function and aggregation)

C. Acute Kidney Injury (AKI) - Multifactorial

Three parallel pathways:
1. Direct nephrotoxicity: PLA₂ + direct toxins → tubular epithelial necrosis (acute tubular necrosis)
2. Hemodynamic: Hypovolaemia (haemorrhage + capillary leak) → reduced renal perfusion
3. Pigment nephropathy: Haemoglobinuria (from haemolysis) + myoglobinuria (from myonecrosis) → tubular obstruction

Result: Oliguria → anuria → AKI (may require dialysis for weeks)

D. Cardiovascular / Shock

Metalloproteinase hemorrhagins → vascular endothelial damage
        ↓
Capillary leak syndrome → massive fluid shifts out of vasculature
        +
Haemorrhage → hypovolaemia
        +
Venom-induced vasodilation
        ↓
Distributive + hypovolaemic shock
        ↓
Multi-organ failure if untreated

E. Anterior Pituitary Infarction (Unique to Russell Viper)

Vascular endothelial damage + coagulopathy 
        ↓
Thrombosis of pituitary portal vessels (pituitary is 
particularly vulnerable due to its dual portal blood supply)
        ↓
Anterior pituitary ischaemic necrosis
        ↓
Pan-hypopituitarism: ↓ ACTH, ↓ TSH, ↓ GH, ↓ LH/FSH
(may present acutely or months-years later as Sheehan-like syndrome)

F. Neurotoxicity (Southeast Asian subspecies - D. siamensis)

Presynaptic PLA₂ neurotoxins → destroy axon terminal at NMJ
        ↓
Impaired acetylcholine vesicle release
        ↓
Flaccid paralysis: ptosis → ophthalmoplegia → bulbar palsy → respiratory failure
(Antivenom does not fully reverse presynaptic damage once established)

4. Non-Pharmacological Management

Pre-Hospital / First Aid (WHO Guidelines)

Hospital Non-Pharmacological Management

• Vital signs every 15-30 min (HR, BP, SpO2, RR)
• Mark leading edge of swelling with pen + time - track every 15-30 min
• Strict hourly urine output measurement (Foley catheter in severe cases)
• Serial 20-Minute Whole Blood Clotting Test (20WBCT) every 6 hours for 24 hours
• Neurological assessment: ptosis, diplopia, swallowing

• Bitten limb: immobilized at or below heart level with a padded splint
• Patient: semi-recumbent or recovery position if vomiting

• Two large-bore peripheral IV lines
• IV normal saline for fluid resuscitation in shock (guided by urine output and BP)
• In capillary leak syndrome: careful fluid balance (avoid fluid overload causing pulmonary oedema)

• If neurotoxicity develops: anticipate airway compromise
• Bag-valve mask, oral airway, intubation equipment at bedside
• Mechanical ventilation if respiratory paralysis occurs

• Do NOT explore or debride wounds early
• Clean wound gently with antiseptic
• Wound review at 48-72 hours; surgical debridement of necrotic tissue as needed
• Skin grafting for extensive necrosis (often required 1-2 weeks post-bite)
• Ophthalmology review if venom spit ophthalmia occurs (copious saline irrigation)

• Haemodialysis (HD) or Continuous Renal Replacement Therapy (CRRT) for established AKI
• Peritoneal dialysis where HD unavailable

• Fasciotomy: generally not indicated for Russell viper bites; reserve only for confirmed compartment syndrome with intracompartmental pressure >30 mmHg AND after adequate antivenom
• Debridement and skin grafting for full-thickness necrosis
• Ophthalmology surgery (rarely, for venom ophthalmia complications)

• Physiotherapy for limb function after necrosis/wound healing
• Occupational therapy for hand injuries
• Psychological support for trauma/PTSD
• Long-term endocrine follow-up for pituitary infarction (screen at 6 months and annually)

5. Pharmacological Management (Pharmacotherapy)

STEP 1: Antivenom - First-Line, Definitive Treatment

• Adrenaline (Epinephrine) 0.25 mL of 1:1000 solution SC, given 15-30 min before infusion (evidence supports this for Indian polyvalent ASV; reduces anaphylaxis incidence)
• Chlorpheniramine maleate 10 mg IV (H1-antihistamine)
• Ranitidine/Promethazine (H2 blocker + sedating antihistamine at some centres)
• Note: Corticosteroids given before antivenom - evidence does NOT support benefit; not standard

STEP 2: Coagulopathy Management

STEP 3: Acute Kidney Injury (AKI) Management

STEP 4: Shock / Cardiovascular Support

STEP 5: Wound Infection (If It Develops)

STEP 6: Neurotoxicity Management (Applicable mainly to D. siamensis populations)

STEP 7: Endocrine Complications (Long-term)

Summary Pharmacotherapy Algorithm

RUSSELL VIPER BITE
        ↓
1. Establish IV access + baseline labs + 20WBCT
        ↓
2. Premedicate: Adrenaline SC + Chlorpheniramine IV
        ↓
3. ANTIVENOM 10 vials IV over 30-60 min
        ↓
4. Repeat 20WBCT at 6 hours
   - Abnormal → Repeat 10 vials ASV
   - Normal → Monitor, no repeat needed
        ↓
5. Coagulopathy persisting after antivenom?
   → FFP + Cryoprecipitate
        ↓
6. AKI developing?
   → IV fluids → Frusemide → Dialysis
        ↓
7. Shock?
   → IV fluids → Noradrenaline/Dopamine
        ↓
8. Infection signs?
   → Targeted antibiotics (not prophylactic)
        ↓
9. Wound necrosis?
   → Debridement + Skin grafting
        ↓
10. Discharge: Tetanus prophylaxis + 
    Pituitary function screening at 6 months

• Goldman-Cecil Medicine, International Ed. - Chapter 98
• Fitzpatrick's Dermatology, Vol. 1-2 - Chapter 182
• WHO Guidelines for the Management of Snakebites - SEARO 2nd Edition
• Medscape - Snakebite Pathophysiology
• ScienceDirect - Viper Venom Overview