• J Clin Anesth · May 2005

    Randomized Controlled Trial Clinical Trial

    The intubating laryngeal mask airway: rocuronium improves endotracheal intubating conditions and success rate.

    • Sunita G Sastry and Harry J M Lemmens.
    • Department of Anesthesiology, Stanford University Medical Center, Stanford, CA 94305-5640, USA.
    • J Clin Anesth. 2005 May 1;17(3):163-6.

    Study ObjectiveTo assess intubating conditions without neuromuscular blocking drugs, to determine the relation between the dose of rocuronium and the probability of achieving excellent or at least good (good or excellent) intubating conditions with the intubating laryngeal mask airway (ILMA), and finally, to determine the relationship between rocuronium use and the success rate of endotracheal intubation.DesignProspective, randomized, double-blinded, placebo-controlled study.SettingUniversity-affiliated medical center.PatientsSixty American Society of Anesthesiologists physical status I and II patients undergoing elective surgery.InterventionsAnesthesia was induced with propofol 2.5 mg/kg and fentanyl 1 microg/kg. One minute after loss of consciousness, patients received rocuronium 0.2 mg/kg or saline. In the rocuronium group, if intubating conditions were scored as poor, rocuronium dose in the next patient was increased by 0.05 mg/kg. If intubating conditions were scored as good, no change was made, but if conditions were scored as excellent, the dose was decreased by 0.05 mg/kg. One minute after rocuronium or saline administration, an ILMA was used to intubate the trachea. If intubation was unsuccessful, a second attempt was made using the ILMA.MeasurementsWe recorded intubating conditions and the success rate of tracheal intubation.Main ResultsWithout rocuronium, the probability of achieving at least good intubating conditions with the ILMA was 30%. A rocuronium dose of 0.2 mg/kg resulted in a probability of 80% to achieve at least good intubating conditions. Rocuronium significantly increased the success rate of the second intubation attempt.ConclusionTo achieve good or excellent intubating conditions with the ILMA, a rocuronium dose lower than the standard intubating dose of 0.6 mg/kg can be used. Neuromuscular blockade increases the success rate of intubation if a second attempt is necessary.

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