Morphine decreases peripheral vascular resistance and increases capacitance in man

The response of the human peripheral circulation to morphine in large doeses independent of cardiac and respiratory influences has not been delineated. In 28 patients during cardiopulmonary bypass, alterations of peripheral vascular resistance (PVR) and capacitance in response to rapid arterial inje...

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Bibliographic Details
Published in:Anesthesiology (Philadelphia) 1979-02, Vol.50 (2), p.98-102
Main Authors: Hsu, H O, Hickey, R F, Forbes, A R
Format: Article
Language:English
Subjects:
Blood Pressure - drug effects
Drug Interactions
Humans
Morphine - administration & dosage
Morphine - pharmacology
Naloxone - pharmacology
Promethazine - pharmacology
Vascular Resistance - drug effects
Vasodilation - drug effects
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Summary:The response of the human peripheral circulation to morphine in large doeses independent of cardiac and respiratory influences has not been delineated. In 28 patients during cardiopulmonary bypass, alterations of peripheral vascular resistance (PVR) and capacitance in response to rapid arterial injection of morphine, 0.5 mg/kg or 1 mg/kg alone, or preceeded by promethazine, 1 mg/kg, naloxone, 10 mug/kg, or naloxone, 20 mug/kg, were recorded over 15 min at a constant perfusion rate. Both doses of morphine decreased PVR by 46 percent at 2 min, with values returning to control at 9 min. When promethazine preceded morphine, the decrease in PVR after morphine was 25 percent. Naloxone did not alter the response. An increase in capacitance of 600 ml observed 5 min after morphine administration did not revert to control after 15 min, and was unaltered by prior administration of naloxone.
ISSN:0003-3022
DOI:10.1097/00000542-197902000-00005