[Effects of succinylcholine on neuromuscular transmission during recovery from vecuronium].
Effects of succinylcholine (SCC), 1 mg.kg-1, given following incomplete recovery from muscle paralysis induced by vecuronium were investigated in 27 female patients undergoing elective surgery, which was performed under epidural anesthesia. Anesthesia was induced with thiamylal 5 mg.kg-1 followed by SCC to facilitate orotracheal intubation. Vecuronium bromide 0.08 mg.kg-1 was given and the lungs were ventilated with 67% N2O in O2 and 0.6% sevoflurane. Neuromuscular function was monitored by means of the induced EMG. The ulnar nerve was stimulated at the wrist. Supramaximal trains of four stimuli (2 Hz for 2 s: pulse width 0.2 ms) were administered every 20 s. The effect of SCC varied depending upon the degree of recovery from vecuronium. At the 25% recovery point, the response to SCC was biphasic, showing an initial reversal followed by an increase of the partial vecuronium block which recovered showing a fade phenomenon on train-of-four stimulation. At the 50% recovery point, an initial reversal was slight. Administered at 75% recovery from vecuronium, SCC produced total neuromuscular blockade without initial recovery. The overall duration of the SCC effect (time from the administration to 90% recovery) was 7-18 min. No prolonged paralysis from SCC occurred.
Miyamoto
M
M
Department of Anesthesiology and Critical Care Medicine, Asahikawa Medical College.
Hirai
H
H
Fujimoto
K
K
Yurino
M
M
Ogawa
H
H
D000328:Adult; D000767:Anesthesia, Epidural; D004576:Electromyography; D005071:Evoked Potentials / Q000187:drug effects; D005260:Female; D006801:Humans; D008875:Middle Aged; D009119:Muscle Contraction / Q000187:drug effects*; D009469:Neuromuscular Junction / Q000187:drug effects*; D013390:Succinylcholine / Q000494:pharmacology*; D009435:Synaptic Transmission / Q000187:drug effects*; D014673:Vecuronium Bromide / Q000494:pharmacology
D014673:Vecuronium Bromide; D013390:Succinylcholine