Coronary circulation, myocardial metabolism and hemodynamics of pacing-induced angina.

The following changes were noted during pacing-induced angina: The coronary sinus blood flow was less than it was during the control period and less than that in the myocardial ischemic group without induced angina. While myocardial oxygen consumption did not increase, myocardial metabolism became anaerobic. The possibility of myocardial dysfunction also was noted.