title: Hemodynamic responses to low doses of naloxone after narcotic-nitrous oxide anesthesia.
abstract: Hemodynamic responses to reversal of phenoperidine-nitrous oxide anesthesia were studied in 14 adult patients before and after naloxone administration (1.5 +/- 0.25 microgram/kg), and, at comparable intervals, in 11 control patients who were permitted to resume respiration spontaneously. Naloxone reversal resulted in significant increases in heart rate (31%), cardiac index (50%), left ventricular stroke work index (53%), and systemic blood pressure (21%), compared with initial values. The heart rate-systolic arterial pressure product, an indirect index of myocardial oxygen consumption, increased significantly (77%). However, changes of similar magnitude occurred after spontaneous recovery in control patients, in whom the only significant treatment-related difference was a longer recovery time. Whether naloxone is used or not, the observed hemodynamic changes may be harmful to patients who have diminished cardiac reserve.
mesh_terms: D000769:Anesthesia, Inhalation; D001794:Blood Pressure / Q000187:drug effects; D002245:Carbon Dioxide / Q000097:blood; D002302:Cardiac Output / Q000187:drug effects; D005260:Female; D006339:Heart Rate / Q000187:drug effects; D006439:Hemodynamics / Q000187:drug effects*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009270:Naloxone / Q000008:administration & dosage / Q000494:pharmacology*; D009609:Nitrous Oxide / Q000037:antagonists & inhibitors; D010101:Oxygen Consumption / Q000187:drug effects; D010638:Phenoperidine / Q000037:antagonists & inhibitors; D014655:Vascular Resistance / Q000187:drug effects
chemical_list: D002245:Carbon Dioxide; D009270:Naloxone; D010638:Phenoperidine; D009609:Nitrous Oxide