Abstract
Anomalous responses to morphine are common in patients with unexplained pain in the upper abdomen after cholecystectomy and may be linked to activation of the sympathetic nervous system. The hypothesis that sympathetic suppression would attenuate anomalous responses to morphine was tested by a randomized, cross-over trial using a standard challenge with morphine, with and without pretreatment with clonidine (300 µg orally, 1 h prior to the administration of morphine). In 13 of the 15 patients who completed the study, pre-treatment with clonidine decreased plasma concentrations of noradrenaline, dopamine and adrenaline by 56, 15 and 25% respectively. This was associated with a significant reduction in morphine-induced pain (p = 0.02) and nausea (p = 0.04) and attenuated increases in plasma aspartate aminotransferase (AST) activity (p = 0.03). Clonidine attenuates anomalous responses to morphine, perhaps through effects on sympathetic nervous activity or plasma concentrations of catecholamines.
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Roberts-Thomson, I.C., Jonsson, J.R. & Frewin, D.B. Sympathetic suppression attenuates anomalous responses to morphine in unexplained pain after cholecystectomy. Clinical Autonomic Research 4, 185–188 (1994). https://doi.org/10.1007/BF01826184
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DOI: https://doi.org/10.1007/BF01826184