Analgesia from morphine and ketamine: a comparison of infusions of morphine and ketamine for postoperative analgesia
1987
Summary
Ketamine 4 μg/kg/minute produced pain relief similar to that from morphine 33 μg/minute in a doubleblind study that compared analgesia from constant-rate intravenous infusions of the two drugs in 60 patients. The analgesic efficacy of the infusions, as assessed by pain scores and the requirement for supplementary self-administered morphine, was poor. Ventilatory depression, the most significant side effect, occurred only in patients who received morphine infusion. The low dose ketamine infusion did not provide clinically useful analgesia even though adequate plasma concentrations were achieved.
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