[Coronary vascular reaction in non-ischemic myocardium during experimental acute ischemia reperfusion].
The aim of this study was to investigate coronary vascular responses, particularly NO-dependent, in the non-ischemic miocardium during local acute myocardial ischemia/reperfusion. The experiments were performed on the dogs with closed chest. Occlusion of a branch of the coronary artery resulted in a dilatation of the coronary vessels within the intact part of the myocardium. Neither inhibition of prostanoid production and KATP-channels, nor administration of atropine sulfate and dissection of the vagus nerve altered coronary dilatation within the non-ischemic myocardium. Whereas inhibition of NOS by L-NNA (50 mg/kg) completely changed it after coronary occlusion, furthermore coronary resistance temporally increased. Thus, the most reliable mechanism of that response was NO-dependent.
D000208:Acute Disease; D000818:Animals; D003326:Coronary Circulation / Q000502:physiology*; D003331:Coronary Vessels / Q000502:physiology; D004195:Disease Models, Animal; D004285:Dogs; D004562:Electrocardiography; D015428:Myocardial Reperfusion Injury / Q000378:metabolism / Q000503:physiopathology*; D009206:Myocardium / Q000378:metabolism*; D009569:Nitric Oxide / Q000037:antagonists & inhibitors / Q000096:biosynthesis*; D019335:Nitroarginine / Q000494:pharmacology; D014664:Vasodilation / Q000502:physiology*
D019335:Nitroarginine; D009569:Nitric Oxide