Falsely increased bispectral index values in a series of patients undergoing cardiac surgery using forced-air-warming therapy of the head.
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.
Hemmerling
Thomas M
TM
Department of Anesthesiology, Centre Hospitalier de l'Université de Montréal, Hôtel-Dieu, Université de Montréal, Québec, Canada. thomashemmerling@hotmail.com
Fortier
Joanne D
JD
D000368:Aged; D000768:Anesthesia, General; D006348:Cardiac Surgical Procedures / Q000009:adverse effects*; D004569:Electroencephalography / Q000187:drug effects*; D005189:False Positive Reactions; D006439:Hemodynamics / Q000187:drug effects; D006801:Humans; D008297:Male; D008875:Middle Aged; D016343:Monitoring, Intraoperative; D017694:Rewarming / Q000009:adverse effects*