• J Clin Anesth · Sep 1996

    Randomized Controlled Trial Comparative Study Clinical Trial

    A mixture of mivacurium and rocuronium is comparable in clinical onset to succinylcholine.

    • J B Stevens, J M Shephered, P A Vories, S C Walker, and M V Vescovo.
    • Anesthesia and Operative Service, Brooke Army Medical Center, San Antonio, TX 78234, USA.
    • J Clin Anesth. 1996 Sep 1;8(6):486-90.

    Study ObjectivesTo compare the clinical onset and duration of a combination of mivacurium and rocuronium with succinylcholine, and to determine the efficacy of this mixture for rapid tracheal intubation.DesignObserver-blind prospective study.SettingTeaching hospital.Patients70 ASA status I and II patients having general anesthesia for elective surgery.Measurements And Main ResultsAfter induction of general anesthesia, patients randomly received succinylcholine 1.0 mg/kg, rocuronium 0.6 mg/kg, or a combination of rocuronium 0.6 mg/kg and mivacurium 0.15 mg/kg. Evoked muscular response at the adductor pollicis was measured by mechanomyography. The time from injection of muscle relaxant(s) to ablation of T1 (clinical onset) and recovery of T1 to 25% of control height (clinical duration) was recorded. Intubating conditions 45 seconds after administration of muscle relaxants were assessed. There was no significant difference in clinical onset time between succinylcholine (mean +/- SD, 47.4 +/- 6.5 seconds) and the combination of mivacurium-rocuronium (51.2 +/- 13.4 seconds). Intubating conditions with mivacurium-rocuronium were comparable to those of succinylcholine. The clinical duration of rocuronium 0.6 mg/kg (38.9 +/- 12.3 minutes) was prolonged by the addition of mivacurium (49.0 +/- 9.6 minutes).ConclusionsThis combination of mivacurium and rocuronium is comparable to succinylcholine in both clinical onset time and quality of intubating conditions. When rapid onset of dense neuromuscular blockade and intermediate clinical duration is desirable, this mixture may be an acceptable alternative to succinylcholine.

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