The validity of bispectral index values from a dislocated sensor: a comparison with values from a sensor located in
Toshinori Horiuchi1, Masahiko Kawaguchi, Naoko Kurita
1Department of Anesthesiology, Nara Medical University, Nara, Japan.
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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