[The effectiveness of the benzodiazepine antagonist Ro 15-1788 after the induction of anesthesia with midazolam].

UNLABELLED: The benzodiazepine antagonist Ro 15-1788 has now been added to the series of antagonists which have been routinely used for a long time. In the present prospective, randomized double-blind study, it is investigated whether Ro 15-1788 is able to antagonize the effect of midazolam applied at a dosage of 0.2 mg/kg for induction of anesthesia.

PATIENTS, MATERIAL AND

METHODS

Thirty female patients (age between 19 and 44 years) undergoing laparoscopy were included in the study. Premedication consisted of an oral dose of 2 mg flunitrazepam given on the evening before the intervention and a 7.5 mg oral dose of midazolam 45 min prior to the induction of anesthesia. After preoxygenation, midazolam was given intravenously at a dose of 0.2 mg/kg body weight for induction of anesthesia. Following extubation either Ro 15-1788 at a dosage of 0.2 mg (2 ml) or an adequate volume of placebo was given according to a randomized double-blind scheme. Those patients whose vigilance status did not change received either Ro 15-1788 or placebo every 60 s up to a maximum total dose of 10 ml. Prior to induction of anesthesia, 5 min after midazolam dosing, prior to and 5, 15, 30, 60 and 120 min after the application of Ro 15-1788, the following parameters were assessed using a multistep rating scale: degree of sedation, comprehension and collaboration, orientation in space and time, anterograde amnesia as well as blood pressure and heart rate.(ABSTRACT TRUNCATED AT 250 WORDS)