[Generated for Academic Purposes] Affiliation: Department of Internal Medicine & Tropical Medicine
SVMPs degrade the basement membrane of capillary endothelial cells. By cleaving type IV collagen, laminin, and fibronectin, they increase vascular permeability, leading to local edema, blistering, and systemic capillary leak syndrome. This directly causes petechiae, ecchymosis, and spontaneous systemic hemorrhage. vasculotoxic snake bite
Pathophysiology, Clinical Spectrum, and Management of Vasculotoxic Snake Envenomation: A Comprehensive Review remains the cornerstone of management.
Unlike physiological thrombin, venom serine proteases (e.g., ancrod, batroxobin) cleave fibrinogen to fibrin without activating factor XIII. This produces unstable, loose fibrin clots that are rapidly lysed, leading to defibrination syndrome . Concurrently, venom activates factor X and prothrombin, leading to consumptive coagulopathy. Antivenom is the mainstay of treatment
Vasculotoxic snake bites, primarily from the Viperidae family (e.g., Russell's viper , Saw-scaled viper , Pit vipers ), constitute a major medical emergency in tropical and subtropical regions. Unlike neurotoxic envenomation, vasculotoxicity targets the vascular endothelium and coagulation cascade, leading to hemorrhage, thrombosis, and consumptive coagulopathy. Objective: To review the pathophysiology, clinical manifestations, diagnostic challenges, and evidence-based management of vasculotoxic snake envenomation. Key Findings: The venom contains metalloproteinases (SVMPs), serine proteases, and phospholipase A2 enzymes that disrupt endothelial integrity, activate coagulation factors inappropriately, and induce platelet aggregation followed by depletion. Clinically, patients present with progressive local swelling, hemorrhagic blebs, systemic bleeding (gingival, intracranial), and acute kidney injury (AKI). The 20-minute whole blood clotting test (20WBCT) remains a crucial bedside diagnostic. Antivenom is the mainstay of treatment, though its efficacy is species-specific. Adjunctive management includes aggressive hydration, monitoring for compartment syndrome, and renal replacement therapy. Conclusion: Vasculotoxic envenomation carries high morbidity and mortality due to hemorrhage and renal failure. Early administration of species-specific polyvalent antivenom, along with close monitoring of coagulation parameters, remains the cornerstone of management.