Pseudocholinesterase describes a family of enzymes produced mainly in the liver but widely found in:
It hydrolyses esters e.g. procaine and suxamethonium. It can occur as a number of variants, dependent on four alleles, with variable degrees of cholinesterase function. The nature of the variants determines sensitivity to suxamethonium; the extreme is pseudocholinesterase deficiency.
Pseudocholinesterases are irreversibly inhibited by organophosphate compounds; the reduction in plasma activity is a means of monitoring exposure of individuals to organophosphates.
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