For a patient bitten by a snake, what is the rationale for keeping the limb at heart level?
To reduce spread of venom
Keeping the bitten limb at or just below heart level (and immobilised) slows venous return from the bite site, thereby reducing the systemic spread of venom while the patient is transported to definitive antivenom therapy. Elevating above heart level accelerates venom spread, while using a tourniquet is now discouraged.
It is not done to help breathing, speed up blood flow or prevent clotting — the single physiological aim is to slow venom distribution.
Hence, To reduce spread of venom.
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