Effect of flumazenil on bispectral index monitoring in unpremedicated patients.
BACKGROUND
Flumazenil is an imidazobenzodiazepine that promptly reverses via competitive inhibition the hypnotic/sedative effects of benzodiazepines on gamma-aminobutyric acid receptors. Endogenous benzodiazepine ligands (endozepines) were isolated in urine, cerebrospinal fluid, and breast milk of women who had not received benzodiazepines. The bispectral index (BIS), an electroencephalographically derived parameter widely used for monitoring the effects of anesthetic/hypnotic drugs, was shown to correlate to various conditions that could influence electroencephalography. The authors examined the hypothesis that 0.5 mg of flumazenil administered to healthy unpremedicated patients during deep surgical remifentanil/propofol anesthesia would increase the BIS value and might expedite recovery from anesthesia.


METHODS
Sixty healthy unpremedicated patients were randomly allocated to the flumazenil or control groups. After study drug administration, the authors compared BIS values and various recovery parameters in the flumazenil and control groups.


RESULTS
BIS baseline values in the flumazenil group (38.7 +/- 3.8) increased 15 min after flumazenil administration (53.2 +/- 4.7), with a significant difference over time (P < 0.0001) between the two groups. Mean recovery parameters time, comprising time to spontaneous breathing, eye opening/hand squeezing on verbal command, extubation, and date of birth recollection, was significantly shorter (P = 0.0002) in the flumazenil group (6.9 +/- 2.6 min) compared with the control group (9.8 +/- 2.9 min).


CONCLUSIONS
This study demonstrates that flumazenil given to healthy unpremedicated patients during propofol/remifentanil anesthesia significantly increased the BIS value and allowed earlier emergence from anesthesia. This may indicate that flumazenil could be used on a case-by-case basis to reverse endogenous or exogenous endozepines that might play a role during anesthesia.
Dahaba
Ashraf A
AA
Department of Anaesthesiology and Intensive Care Medicine, Medical University of Graz, Graz, Austria. ashraf.dahaba@medunigraz.at
Bornemann
Helmar
H
Rehak
Peter H
PH
Wang
Geng
G
Wu
Xin Min
XM
Metzler
Helfried
H
D000328:Adult; D000762:Anesthesia Recovery Period; D000768:Anesthesia, General / Q000379:methods; D004569:Electroencephalography / Q000187:drug effects* / Q000379:methods*; D005260:Female; D005442:Flumazenil / Q000494:pharmacology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D016343:Monitoring, Intraoperative / Q000379:methods*; D011292:Premedication; D011446:Prospective Studies
D005442:Flumazenil