Suxamethonium apnoea associated with plasmaphoresis.

A patient is reported who developed suxamethonium apnoea as a result of reduction in serum cholinesterase activity secondary to both pregnancy and plasmaphoresis. Had the enzyme studies been carried out before operation, regional rather than general, anaesthesia would have been used. In order to avoid the problems associated with prolonged paralysis we recommend the measurement of cholinesterase activity in all patients who have undergone plasmaphoresis and in whom anaesthesia involving the use of suxamethonium is contemplated.