In this study, we have demonstrated, in rat phrenic nerve hemidiaphragm preparation, that (a) verapamil (2.2–220 μM) potentiated atracurium (0.8–80 μM)-induced neuromuscular blockade, by enhancing atracurium-induced depression of indirect twitch tension, by 35–45%, (b) neostigmine (60 nM) and edrophonium (50 nM) both effectively (by 18±2% and 25±1%, respectively, means ± S.E., n = 6, P< 0.05, P< 0.01) reversed atracurium and atracurium-verapamil blockade, with no significant difference between the reversals of the latter two blockades, and (c) verapamil may act at both pre- and postjunctional sites at the rat neuromuscular junction.
It was concluded that verapamil, by acting at both pre- and postjunctional membranes, enhanced atracurium-induced neuromuscular blockade and that the combined atracurium-verapamil blockade can be easily reversed with anti-cholinesterase agents.
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Wali, F.A., McAteer, E. & Suer, A.H. Interaction of verapamil with atracurium and reversal of combined neuromuscular blockade with edrophonium and neostigmine. I.J.M.S. 156, 215 (1987). https://doi.org/10.1007/BF02954043
- Neuromuscular Blockade