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Neurotoxicity caused by snake venom — Clinical Guidelines

Overview

Neurotoxicity caused by snake venom refers to the adverse neurological effects resulting from envenomation, often involving neurotoxins that affect neuromuscular transmission, leading to symptoms such as paralysis, fasciculations, and in severe cases, respiratory failure. 1 2 14 20 35

Diagnosis

Clinical Presentation: Localized pain, swelling, systemic symptoms (e.g., fever, nausea), and neurological signs (e.g., ptosis, diplopia, paralysis). 1 20 35

Neurological Assessment: Evaluate for cranial nerve palsies, muscle weakness, and respiratory involvement. 20 35

Laboratory Tests: Monitor coagulation profiles, electrolytes, and liver function tests, especially in cases involving Bothrops species. 9 10 18

Electrophysiological Studies: Nerve conduction studies and electromyography may help in assessing neuromuscular junction dysfunction. 20

Management

Antivenom Therapy: Administer specific antivenom based on the snake species identified or suspected. Dosing should be guided by clinical response and severity (refer to dosing algorithms). 1 17 22 26

Supportive Care: Mechanical ventilation for respiratory failure, intravenous fluids, and monitoring in intensive care units. 14 20 35

Neuromuscular Blockers: Consider in cases of severe muscle fasciculations or respiratory muscle involvement. 14

Hemostatic Support: Manage coagulopathy with fresh frozen plasma, vitamin K, and clotting factor concentrates as needed. 9 10

Special Populations

Pediatrics: Antivenom dosing may require adjustment; CroFab dosing in pediatrics is still under investigation. 26

Elderly: Increased vigilance for systemic complications and supportive care tailored to comorbidities. 1 20

Comorbidities: Patients with pre-existing respiratory or hepatic conditions may require more intensive monitoring and intervention. 9 18

Key Recommendations

Administer specific antivenom promptly based on snake identification or clinical suspicion to neutralize neurotoxins (Evidence: Strong 1 2 17).

Initiate supportive care measures including mechanical ventilation for respiratory compromise (Evidence: Strong 14 20).

Monitor and manage coagulopathy with appropriate hemostatic agents (Evidence: Moderate 9 10).

Tailor management in special populations, particularly adjusting antivenom dosing in pediatric cases (Evidence: Weak 26).

Closely observe elderly patients and those with comorbidities for exacerbated complications (Evidence: Expert opinion 1 20).

References

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Neurotoxicity caused by snake venom