PMID: 3767039Oct 1, 1986Paper

Succinylcholine: mechanism of fasciculations and their prevention by d-tubocurarine or diphenylhydantoin

Anesthesiology
G S HartmanW F Riker

Abstract

Administration of d-tubocurarine (dTC) or diphenylhydantoin (DPH) was evaluated as a pretreatment to prevent succinylcholine (Sch) evoked fasciculations. Experiments were designed to determine the nature of the drug-drug interactions, sites of interaction, and site of fasciculation suppression. Sch is known to evoke repetitive discharge generation by motor nerve terminals (MNTs). Transmission of these prejunctional discharges causes fasciculations. A cat soleus neuromuscular preparation in situ, which enables recording of nerve action potentials initiated by MNTs, their transmitted muscle action potentials, and the resultant contractile responses, was used to explore Sch effects before and after iv pretreatment with dTC or DPH. dTC is known to act prejunctionally to suppress repetitive discharges initiated by facilitatory drugs and tetanic conditioning of MNTs. Accordingly, pretreatment with dTC 50 micrograms X kg-1 suppressed the Sch-induced MNT repetitive discharging and correspondingly suppressed generalized fasciculations without affecting twitch. This dTC dose, however, also reduced Sch blocking potency by 33%, slowed its rate, and shortened block duration. These latter effects represent competitive postjunctional antagoni...Continue Reading

Citations

Nov 1, 1994·Muscle & Nerve·R B Layzer
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