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There was a uworld Q on this. The duration of action of Succinylcholine is determined by its metabolism by plasma cholinesterase. Some people are homozygous for an abnormal plasma cholinesterase, aka "pseudocholinesterase" or "butyrylcholinesterase" (BCHE). People with a homozygous BCHE mutation have delayed metabolism of succinylcholine, mivacurium, heroin, and cocaine.
In these patients, paralysis from succinylcholine can last for hours and you have to maintain them on mechanical ventilation until they can breath on their own
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