Anesth Analg 2007;104:857-859
© 2007 International Anesthesia Research Society
doi: 10.1213/01.ane.0000258764.37968.bb
TECHNOLOGY, COMPUTING, AND SIMULATION
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, MD,
Masahiko Kawaguchi, MD,
Naoko Kurita, MD,
Satoki Inoue, MD, and
Hitoshi Furuya, MD
From the Department of Anesthesiology, Nara Medical University, Nara, Japan.
Address correspondence and reprint requests to Masahiko Kawaguchi, MD, Department of Anesthesiology, Nara Medical University, 840 Shijo-cho, Kashihara, Nara 634-8522, Japan. Address e-mail to drjkawa{at}naramed-u.ac.jp.
BACKGROUND: The 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.
METHODS: We 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.
RESULTS: Bland and Altman analysis revealed better agreement of two BIS values when the values during induction of and emergence from anesthesia were excluded.
CONCLUSIONS: The results indicate that during induction of and emergence from general anesthesia, a dislocated BIS sensor may produce questionable BIS values.
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