Vecuronium in the myasthenic patient.

The use of vecuronium in six patients with myasthenia gravis undergoing thymectomy is described the train-of-four twitch technique was used to monitor neuromuscular function. The first two patients received an initial dose of 0.02 mg/kg and incremental doses of 4 micrograms/kg, which is in the order of one fifth of that normally used. Satisfactory depression of the first twitch of the train-of-four, however was not obtained and, therefore, in the remaining four patients the doses were doubled. At this dose satisfactory depression of the first twitch was achieved. Neostigmine 5.0 mg produced adequate reversal of residual neuromuscular blockade and the train-of-four twitch response recovered to normal levels. With reduced dosage and with careful neuromuscular monitoring, vecuronium can be used safely in the myasthenic patient.