Bolus application of remifentanil with propofol for dilatation and curettage.

Background and objective: This study was designed to determine which single bolus dose of remifentanil in combination with propofol and nitrous oxide is best to control the haemodynamic, autonomous and somatic responses in patients scheduled for dilatation and curettage of the uterine cervix. We evaluated the adequacy of different bolus doses of remifentanil, associated with propofol and nitrous oxide, for dilatation and curettage in a prospective double-blind study. Methods: After institutional approval and informed consent, 34 healthy females undergoing curettage to remove material from the uterus after spontaneous abortion were randomized to receive remifentanil 0.5 pg kg - 1 intravenously (i.v.) (Group A; n = 4), 1 μg kg - 1 ι.v. (Group B; n = 15) or 1.5 μg kg - 1 i.v. (Group C; n = 15), with propofol 2 mg kg - 1 i.v. in all groups. Anaesthesia was maintained with 60% nitrous oxide in oxygen. Haemodynamic, somatic and autonomic signs of light anaesthesia were registered to assess the response to surgical stress. Recovery times and Aldrete score were recorded at the end of the procedure. Results: The groups were similar with regard to biometric data and duration of surgery. The poor results using the lowest dose of remifentanil obliged us to abandon this dose. The total dose of remifentanil was larger in Group C (100 ′ 5.7 μg vs. 65 ′ 4.1 μg in Group B; P < 0.05), but more patients required extra bolus injections in Group B (69% vs. 38% in Group C; P < 0.01). Recovery times were significantly shorter in Group C. Aldrete scores when leaving the operation room was similar. Conclusions: Remifentanil 1.5 μg kg - 1 i.v. with propofol 2 mg kg - 1 i.v. and 60% nitrous oxide in oxygen provided the best anaesthetic control with the fastest recovery times.