• Anesthesia and analgesia · Apr 2007

    Comparative Study

    The validity of bispectral index values from a dislocated sensor: a comparison with values from a sensor located in the commercially recommended position.

    • Toshinori Horiuchi, Masahiko Kawaguchi, Naoko Kurita, Satoki Inoue, and Hitoshi Furuya.
    • Department of Anesthesiology, Nara Medical University, Nara, Japan.
    • Anesth. Analg. 2007 Apr 1;104(4):857-9.

    BackgroundThe influence of sensor dislocation on bispectral index (BIS) values is not clear. We compared the BIS values obtained from dislocated sensors with those from the commercially recommended positions.MethodsWe used two BIS sensors for each patient receiving propofol-based anesthesia; one in the recommended position and one positioned around the lateral corner of the right eye.ResultsBland and Altman analysis revealed better agreement of two BIS values when the values during induction of and emergence from anesthesia were excluded.ConclusionsThe results indicate that during induction of and emergence from general anesthesia, a dislocated BIS sensor may produce questionable BIS values.

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