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CARDIOVASCULAR ANESTHESIA

Falsely Increased Bispectral Index Values in a Series of Patients Undergoing Cardiac Surgery Using Forced-Air-Warming Therapy of the Head

Department of Anesthesiology, Centre Hospitalier de l’Université de Montréal, Hôtel-Dieu, Université de Montréal, Québec, Canada

Address correspondence and reprint requests to Thomas M. Hemmerling, MD, DEAA, Centre Hospitalier de l’Université de Montréal, Hôtel-Dieu, Département d’Anesthésiologie, 3840, Rue Saint-Urbain, Montreal, PQ, H2W 1T8. Address e-mail to thomashemmerling{at}hotmail.com

IMPLICATIONS: 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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