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Outcome after general anaesthesia for repair of fractured neck of femur. A randomized trial of spontaneous v. controlled ventilation.

One hundred and fifty-two patients undergoing surgery for fractured neck of femur were randomly allocated to receive either general anesthesia with spontaneous ventilation with nitrous oxide and halothane in oxygen or general anaesthesia with controlled ventilation with fentanyl, nitrous oxide and halothane in oxygen. Atracurium was used to provide muscle paralysis in 65% of the latter group, the remainder receiving no neuromuscular blocking agent other than suxamethonium for intubation. Patients were followed up for 6 months. Mortality and outcome were not significantly different between the groups. Overall mortality at 4 weeks was 5.2%, and at 6 months was 15.1%--figures which are considerably lower than in some other comparable studies. This study does not support the suggestion that general anaesthesia with controlled ventilation is associated with increased postoperative mortality.