• J Clin Monit Comput · Jan 2000

    Randomized Controlled Trial Clinical Trial

    The relationship between rate of administration of an intubating dose of rocuronium and time to 50% and 90% block at the adductor pollicis muscle.

    • A De Haes, D J Eleveld, and J M Wierda.
    • Research Group for Experimental Anesthesiology and Clinical Pharmacology, University of Groningen, Groningen, The Netherlands.
    • J Clin Monit Comput. 2000 Jan 1; 16 (3): 219-22.

    ObjectiveTo determine the relationship between the rate of rocuronium injection and the onset time of neuromuscular block.MethodsAfter intravenous induction, 60 female patients (ASA I-II) were assigned randomly into 3 groups for rocuronium administration within 1-15, 15-30 or 30-60 seconds. Acceleromyography of the thumb was performed using train-of-four (TOF) stimulation. Times to 50% and 90% twitch depression of the first twitch of the TOF stimulation (T1) were recorded.ResultsInjection time significantly influences time to 50% relaxation, but not time to 90% relaxation. Body mass index is negatively correlated with time to 50% and 90% relaxation.ConclusionsWe conclude that rate of injection influences only the initial phase of development of the block and that slower injection times do not significantly affect time to 90% relaxation at the adductor pollicis muscle.

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