Comparison of the anaesthetic requirement with target-controlled infusion of propofol to insert the laryngeal tube vs. the laryngeal mask.

摘要

SummaryBackground and objective: The target effect-site concentration of propofol to insert a laryngeal mask airway was recently reported as almost 5 mug mL-1. The present study aimed to determine the target effect-site concentration with target-controlled infusion of propofol to place classical larnygeal mask airway or current laryngeal tube in adult patients. Methods: We included 40 patients scheduled for short gynaecological and radiological procedures under general anaesthesia in a randomized, double-blind manner using the Dixon's up-and-down statistical method. Monitoring included standard cardiorespiratory monitors, and bispectral index monitoring was used for all patients. Anaesthesia was conducted with a target-controlled infusion system: Diprifusortrade mark. The initial target plasma concentration of propofol was 5 mug mL-1, and was changed stepwise by 0.5 mug mL-1 increments according to Dixon's up-and-down method. Criteria for acceptable insertion were: Muzi's score