Postoperative analgesia with buprenorphine : A comparative study of epidural, patient-controlled intravenous and conventional subcutaneous administration.

Thirty patients who had undergone elective anterolateral thoracotomy were studied in the surgical intensive care unit to compare the analgesic effectiveness of i.v. self-administered buprenorphine (group A) with that of epidural administration (group B) and of s.c. administration by a nurse of 0.3 mg buprenorphine every 3-4 h (group C, controls). Every 2 h the patients were asked to record their subjektive pain level as a percentage on an analogue scale: zero was to be used for no pain and 100% for the most severe pain they could imagine. the mean of all analogue scores for pain in the first 36 h was 19.4+/-3.1 for group A; 18.4+/-2.3 for group B and 42.0+/-7.4 for group C (P