Abstract
Fifty-six surgical patients self-administered i.v. narcotic analgesics to combat postoperative pain. Analgesic demand per h was 2.7 +/- 1.1 mg of morphine, 26 +/- 10 mg of pethidine or 2.3 +/- 0.8 mg of ketobemidone, which reflects the equianalgesic ratios. Acute respiratory depression was seen in two hypovolaemic patients as evidenced by a raised PaCO2 on air breathing. Carbon dioxide retention disappeared upon correction of hypovolaemia. Late respiratory complications of short duration were encountered in 13%. Drowsiness and dry mouth were the most frequent complaints. Self-administered analgesia was considered highly satisfactory by the patients.
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