the results suggest that oxygen balance at the regional subendocardium is deteriorated through tachycardia and hypotension and a vasodilatory effect is seen largely at the subepicardium after isoproterenol to the heart with coronary stenosis , and that an increase in myocardial contractility per se does not deteriorate the oxygenation at the subendocardium .
C0039231
tachycardia
C0022245
isoproterenol