Postoperative muscle pain following suxamethonium is a well known problem.',* Recently it has been reported that diazepam has protective effects against these muscle pains3 This study was taken to confirm this observation and also to observe a dosc rclatcd cffcct of diazepam on suxamethonium pains.
Muterid und method.,Various factors such as age, sex, type and duration of' operation. body weight. body position and anaesthetic technique may affect the incidence of suxaniethonium pains. In this study female patients of average body weight 40 kg. aged 20 to 45 years, of physical status 1 in the ASA classification, undergoing tuba1 ligation were studied. Patients with cardiac. respiratory. renal and neurological disorders were excluded. All patients were hospitalised and were ambulatory 6 to 8 hours after operation. Patients were given various doses of diazepam (Table I). It was planned to have 25 patients in each group, but in the diazepam group nine paticnts given a dose of 5 mg diazepam required an additional dose of suxamethonium and have. therefore. been excluded from the series.All patients werc given atropine 0.65 mg intravenously prior to induction. No other drugs were used. .,.
Experimrn~al Diazepam given
~~Anaesthesia for the patients in the control group was induced with 250 mg thiopentone. The same dose was uscd in all patients becausc of the infucnce of thiopentone on the incidence of pain after administration of s u~a m e t h o n i u m .~ Suxamethonium 50 mg was given immediately after the thiopentone as a single injcction. Anaesthesia was maintained with oxygen and ether through a sem-closed circuit. Thc same tcchnique was employed in the experimental group except that diazepam in 5. 10. 15 and 20 mg doses was given intravenously 5 minutes prior t o suxamethonium.Postoperatively paticnts were asked about muscle pains by a doctor who was unaware of the drugs used