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Principles of First Aid First aid should follow some basic principles, if it is to be valid.
For cases of envenoming, such as snakebite, the hoped-for benefit from first aid is immobilisation of venom at the bite site, delaying more widespread venom effects until medical treatment can be obtained. There is a potential problem, for by confining venom effects to the local bite area, it may make these local effects worse. This is a problem for envenoming by species that cause mainly local effects, rather than general effects. It is for this reason that first aid methods such as the Australian "pressure immobilisation bandage" may not be appropriate for bites by species causing local tissue injury (eg North American rattlesnakes, many other vipers, some cobras).
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