Local anaesthetic infusion for postoperative pain.

The role of continuous bupivacaine infusion either into the wound or as a local nerve block, following hand surgery was investigated in 100 patients. After excluding six patients with complex pain problems in whom neither the bupivacaine infusion nor any other conventional analgesic techniques provided adequate analgesia post-operatively, 86 of 94 (91%) patients were adequately treated for post-operative pain by this system during the first night after surgery when pain is presumed to be greatest. This system also provided adequate on-going analgesia for up to 1 week after surgery, controlling nerve pain and allowing mobilization of tendons after tenolysis. Continuous bupivacaine infusion is of particular use in these two groups of patients and after major hand injuries, when considerable pain can be anticipated. Pain during the first night was not controlled adequately by the bupivacaine infusion system in eight of the 94 patients (8%). All eight had a technical failure of the system, which was rectified in six cases to restore adequate analgesia by the infusion system. Two patients developed infection at the infusion cannula insertion site, which occurred only after 1 week and was successfully treated by removal of the cannula and oral antibiotics.