Pain relief after abdominal surgery--a comparison of i.m. morphine, sublingual buprenorphine and self-administered i.v. pethidine.

One hundred and twenty-six patients undergoing upper and lower abdominal surgery were studied after operation to compare the analgesic effects of i.m. morphine, sublingual buprenorphine and self-administered i.v. pethidine by Cardiff Palliator. There were no significant differences between analgesic regimens in respect of subjective linear analogue pain scores or static and dynamic lung volumes assessed at 24 and 48 h after operation and 5 days after operation in patients who underwent upper abdominal surgery. Sublingual buprenorphine produced more nausea and sedation than the other two treatments, but the differences were not clinically important. However, it offered considerable advantages in terms of ease of administration.

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