• Anesthesia and analgesia · Aug 1997

    Randomized Controlled Trial Comparative Study Clinical Trial

    Immediate 8% sevoflurane induction in children: a comparison with incremental sevoflurane and incremental halothane.

    • V C Baum, T A Yemen, and L D Baum.
    • Department of Anesthesiology, University of Virginia, Charlottesville 22908, USA.
    • Anesth. Analg. 1997 Aug 1;85(2):313-6.

    AbstractWe compared the efficacy and tolerance of pediatric inductions with immediate 8% sevoflurane in 70% nitrous oxide with either incremental sevoflurane or incremental halothane in 70% nitrous oxide. Forty-six unpremedicated children had anesthesia induced by immediate 8% sevoflurane (high sevoflurane [HS]; circuit primed with 70% N2O and 8% sevoflurane before application of the face mask), gradual sevoflurane (GS; primed with 70% N2O with increments of sevoflurane), and gradual halothane (HAL; 70% N2O with incremental halothane). Blind video recordings were made, and each child's distress was rated prior to mask application, during mask application, and every 10 s thereafter using a behavioral rating scale. There were no complications. Of those subjects not quiet and cooperative throughout, times to complete quiet were significantly different (P = 0.001): HS 19.8 +/- 8 s (range 9-34); GS 52 +/- 17 s (range 8-73); HAL 43 +/- 22 s (range 13-73). Times to eye closure were also significantly different (P < 0.001): HS 37 +/- 10 s (range 15-56); GS 70 +/- 18 s (range 35-114); HAL 81 +/- 34 s (range 55-140). Distress scale scores showed more rapid decrement with HS than with GS or HAL. We conclude that 1) immediate 8% sevoflurane/N2O results in a significantly faster induction than GS or HAL;2) in children, HS in N2O will not result in a single-breath induction under the conditions of this study; 3) in this small group, HS was extremely well tolerated in ASA class I and II patients.

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