• J Clin Anesth · Sep 1993

    Randomized Controlled Trial Clinical Trial

    Midazolam pretreatment does not ameliorate myoglobinemia or the clinical side effects of succinylcholine.

    • Q A Fisher, E Fisher, and M J Matjasko.
    • Department of Anesthesiology, University of Maryland, Baltimore.
    • J Clin Anesth. 1993 Sep 1; 5 (5): 414-8.

    Study ObjectiveTo determine whether the levels of serum myoglobin and the occurrence of fasciculations and postoperative symptoms following a single dose of succinylcholine are modified by the prior administration of midazolam.DesignRandomized, double-blind, placebo-controlled study.SettingOutpatient surgical service of a university hospital.Patients69 ASA physical status I and II healthy, adult female outpatients undergoing laparoscopy (for diagnosis or tubal ligation) with general anesthesia that included succinylcholine.InterventionsPatients received pretreatment of either a saline placebo (Group 1, n = 31) or intravenous midazolam 0.03 mg/kg (Group 2, n = 38) 5 minutes before succinylcholine.Measurements And Main ResultsSerum myoglobin prior to pretreatment and at 5 (t5) and 30 (t30) minutes after succinylcholine was determined by radioimmunoassay. Pain was assessed by telephone interview 24 to 36 hours postoperatively. Baseline myoglobin levels ranged from 14 to 69 ng/ml; the 5- and 30-minute samples varied widely (range, 16 to 900 ng/ml). The rise was 3 or more SDs above the baseline mean in 23% and 42% of Group 1 at t5 and t30, respectively, and in 21% and 35% of Group 2 at t5 and t30, respectively. The differences between groups were not significant. The frequency of fasciculations (77% in Group 1, 87% in Group 2), postoperative sore throat (64% in Group 1, 57% in Group 2), and myalgias (44% in Group 1, 51% in Group 2) also was not significantly different between groups.ConclusionsMidazolam had no effect on myoglobin level or postoperative symptoms following succinylcholine.

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