title: Attenuation of exercise-induced myocardial ischemia in dogs with recruitment of coronary vasodilator reserve by nifedipine.
abstract: There is now evidence that under resting conditions coronary vasodilator reserve exists even in the presence of myocardial ischemia. Therefore, we tested the hypothesis that a vasodilator reserve may exist during exercise so that during exercise-induced ischemia a reduction in coronary constrictor tone can be produced that attenuates the decreases in regional myocardial blood flow and function distal to a severe coronary stenosis without changing the determinants of myocardial oxygen demand. Nine dogs were instrumented with an ameroid constrictor on the left circumflex coronary artery and were studied 2 to 3 weeks later. During a control treadmill run, heart rate increased from 119 +/- 20 to 225 +/- 20 beats/min and peak left ventricular pressure increased from 144 +/- 17 to 163 +/- 28 mm Hg. Poststenotic subendocardial blood flow (measured by a microsphere technique) fell from 1.19 +/- 0.36 to 0.51 +/- 0.30 ml/min X g and systolic wall thickening (by sonomicrometry) decreased from 24.3 +/- 5.8% to 6.0 +/- 6.1%. During an identical run after nifedipine (10 micrograms/kg iv), systemic hemodynamics were not significantly altered. However, subendocardial blood flow was increased to 0.85 +/- 0.51 ml/min X g (p less than .05) and systolic wall thickening to 11.4 +/- 7.8% (p less than .01). We conclude that in this study the amelioration of exercise-induced myocardial ischemia was due to the recruitment by nifedipine of coronary vasodilator reserve.
mesh_terms: D000818:Animals; D003326:Coronary Circulation; D003327:Coronary Disease / Q000188:drug therapy* / Q000209:etiology; D003331:Coronary Vessels / Q000503:physiopathology*; D004285:Dogs; D006339:Heart Rate / Q000187:drug effects; D006439:Hemodynamics / Q000187:drug effects; D009200:Myocardial Contraction / Q000187:drug effects; D009543:Nifedipine / Q000627:therapeutic use*; D005082:Physical Exertion; D014664:Vasodilation / Q000187:drug effects*
chemical_list: D009543:Nifedipine