Abstract
We prospectively compared the ability of antivenom and edrophonium (Tensilon ®) to improve paralytic symptoms in 8 patients envenomed by the Philippine cobra ( Naja naja philippinensis). Twenty, 50 or 100 ml of Philippine cobra antivenom were administered in a double-blind fashion by constant intravenous infusion over 30 min. Even the largest dose of antivenom failed to produce marked improvement within 2 h, though enzyme-linked immunosorbent assays and neutralization tests demonstrated that it possessed high titres of anti-neurotoxin antibodies. Tensilon ® given at 2 h was significantly more effective than antivenom at increasing the duration of upward gaze (78±28 vs 43±26 sec, P<0·001), and either completely reversed or markedly decreased paralysis in every patient. The Tensilon ® test should be given to all patients with paralytic envenoming by cobras, and anticholinesterases administered to those with a positive response.
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