snakebite

snakebite, wound inflicted by the teeth of a snake. The bite of a nonvenomous snake is rarely serious. Venomous snakes have fangs, hollow teeth through which poison is injected into a victim. All types of snake venom contain a toxin that affects the nerves and tends to paralyze the victim. In addition, the venom of the coral snake, the cobra, and the South American rattlesnake contains constituents that damage blood cells and dissolve the linings of the blood vessels and the lymphatic vessels, causing severe or fatal internal hemorrhage and collapse. First aid for venomous snakebites consists of retarding the spread of the poison through the circulatory system by applying a constricting band or an ice pack, or by spraying ethyl chloride on the wound. It is essential that the patient avoid exertion and the taking of stimulants, as both increase the pulse rate. The constricting band should be applied above the swelling caused by the wound; it should be tight, but not tight enough to stop the pulsing of the blood. If only a few minutes have passed since the infliction of the bite, it is possible to remove much of the poison by suction (see first aid). Antivenins, which counteract the toxins, are available for most types of snake venom. The two main groups of poisonous snakes in the United States are the coral snakes, which rarely attack humans unless provoked, and the pit vipers (copperhead, cottonmouth moccasin, the various rattlers), which require no provocation.

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snakebite

Wound from the bite of a snake, especially a venomous one. Nonvenomous snakes leave skin tears that may be treated like scratches. A person bitten by a venomous snake needs medical care as soon as possible. Antivenin must be specific to the type of venom, so the snake should be identified or accurately described. Different kinds of venom break down red blood cells or attack the nervous system, causing paralysis. Local tissue destruction may lead to gangrene. First aid for snakebite seeks to keep the venom from spreading to the rest of the body. The bitten limb should be kept still below heart level with a broad, firm (not tight) bandage around it above the bite. Exertion and excitement should be avoided. Cutting, suction, tourniquets, and applying ice are not advised.