title: Beneficial effects of the opiate antagonist naloxone on hemodynamics and ventricular function following coronary artery occlusion and reperfusion in the dog.
abstract: It has been shown that endogenous opioid peptides (EOP) subserve important roles in cardiovascular regulation and are involved in the pathophysiology of myocardial ischemia, contributing to the deleterious effects. The aim of this study was to evaluate the effects of the opiate antagonist naloxone on the hemodynamics and ventricular function following coronary artery occlusion and reperfusion in the dog, utilizing the technique of cardiac catheterization. During myocardial ischemia and reperfusion, it was found that in the control group, there was reduction in the aortic, left ventricular, right atrial, pulmonary arterial and wedge pressures, and in the left ventricular dP/dt. The reduction in the aortic, left ventricular and pulmonary arterial pressures, and left ventricular dP/dt were significantly attenuated by pretreatment with naloxone. The results indicate a regulatory role of EOP in the cardiovascular function and suggest a possible involvement of EOP in myocardial ischemia and reperfusion causing detrimental effects such as arrhythmias, bradycardia, hypotension and, as shown in this study, impaired hemodynamics and ventricular function. The beneficial effects of naloxone on circulatory dynamics may have clinical implications in the prevention and treatment of ischemic heart disease.
authors.affiliation: Department of Medical Research and Cardiology, Taichung Veterans General Hospital, Taiwan, Republic of China.
authors.forename: A Y
authors.initials: AY
authors.lastname: Lee
authors.forename: Y T
authors.initials: YT
authors.lastname: Chen
authors.forename: C J
authors.initials: CJ
authors.lastname: Lin
authors.forename: J P
authors.initials: JP
authors.lastname: Wu
authors.forename: K S
authors.initials: KS
authors.lastname: Chen
mesh_terms: D000818:Animals; D001145:Arrhythmias, Cardiac / Q000209:etiology / Q000517:prevention & control; D001919:Bradycardia / Q000209:etiology / Q000517:prevention & control; D004285:Dogs; D004723:Endorphins / Q000502:physiology; D005260:Female; D006439:Hemodynamics / Q000187:drug effects*; D007022:Hypotension / Q000209:etiology / Q000517:prevention & control; D008297:Male; D017202:Myocardial Ischemia / Q000150:complications / Q000503:physiopathology*; D015425:Myocardial Reperfusion; D009270:Naloxone / Q000494:pharmacology* / Q000627:therapeutic use; D016277:Ventricular Function, Left / Q000187:drug effects*
chemical_list: D004723:Endorphins; D009270:Naloxone