Postoperative analgesic requirements following flumazenil administration.
The effect of flumazenil (RO 15-1788) on postoperative analgesic requirements was evaluated in 30 postoperative patients. This prospective investigation was a double-blind, placebo-controlled trial in patients undergoing general anesthesia supplemented by midazolam and fentanyl or sufentanil. Patients received either flumazenil (n = 20) or placebo (n = 10) by random assignment. Analgesic requirements were measured in morphine equivalents (MEs) and were recorded for a three-hour period following the administration of flumazenil. All patients received the assigned treatment within five minutes of arrival to the postanesthesia room. Total ME requirements were 4.1 +/- 3.8 mg for the flumazenil group and 4.5 +/- 4.6 mg (p = 0.71) for the placebo group. Patient analgesic requirements were also assessed when patients were adequately alert. For the flumazenil group this time period was 6.2 +/- 12.7 minutes versus 52.9 +/- 28.4 minutes for placebo (p less than 0.01). MEs (flumazenil 4.1 +/- 3.8 mg vs. placebo 3.7 +/- 3.2 mg) were not significantly different (p = 0.57) when similar levels of consciousness were compared. The onset of pain was more rapid with flumazenil patients as evidenced by the first analgesic dose at 15.7 +/- 25.1 minutes for the flumazenil group versus 34.7 +/- 43.7 for the placebo group; however, these data were not statistically different (p = 0.144). These results suggest that flumazenil does not increase postoperative analgesic requirements during the immediate postanesthesia period; however, patients receiving flumazenil may experience an earlier onset of postoperative pain.
Olsen
K M
KM
Department of Pharmacy Practice, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock 72205.
Pablo
C S
CS
Ackerman
B H
BH
D000328:Adult; D000700:Analgesics / Q000008:administration & dosage*; D004311:Double-Blind Method; D005260:Female; D005442:Flumazenil / Q000008:administration & dosage* / Q000494:pharmacology; D006801:Humans; D008297:Male; D008874:Midazolam; D008875:Middle Aged; D009020:Morphine / Q000008:administration & dosage*; D010149:Postoperative Pain / Q000517:prevention & control; D011446:Prospective Studies; D013810:Therapeutic Equivalency; D013997:Time Factors
D000700:Analgesics; D005442:Flumazenil; D009020:Morphine; D008874:Midazolam