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Case Reports
. 2002 Aug;95(2):322-3, table of contents.
doi: 10.1097/00000539-200208000-00014.

Falsely increased bispectral index values in a series of patients undergoing cardiac surgery using forced-air-warming therapy of the head

Thomas M Hemmerling  1 , Joanne D Fortier
Affiliations
Case Reports

Falsely increased bispectral index values in a series of patients undergoing cardiac surgery using forced-air-warming therapy of the head

Thomas M Hemmerling et al. Anesth Analg. 2002 Aug.

Abstract

Falsely increased bispectral index (BIS) values of >70 occur during forced-warm-air therapy in patients undergoing cardiac surgery. When forced-warm-air therapy for the head is used (as in ultra-fast-tracking cardiac patients), BIS interpretation needs careful examination. Falsely increased BIS values can easily be recognized when the warm-air flow is stopped. Within 2-3 min, BIS returns to a much lower, "true" value.

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