Controlled hypotension and moderate haemodilution in major hip surgery.

This study presents a series of 38 patients in whom total hip replacement was performed by using a hypotensive anaesthetic technique with moderate haemodilution. 17 patients operated on during normotension without haemodilution served as controls. Halothane, d-tubocurarine and pentolinium tartrate were the agents used. During the operation circulation was monitored carefully. Hypotension with haemodilution decreased the amount of the transfused blood to 1/3, compared with the normotensive group. The bloodless field during the hypotension also shortened the duration of the operations. No complications attributable to the hypotensive technique occurred. The results suggest that the hypotensive anaesthetic technique with haemodilution reduces the need for blood transfusion in major surgery. However, only patients in good cardiovascular status are suitable for this technique, and careful monitoring of the circulation is mandatory during the anaesthesia.