Effects of Autonomic Nerves and Their Mediators on the Coronary Circulation and Myocardial Contraction

摘要: Mean and phasic coronary flows were recorded simultaneously by an electromagnetic meter, peripheral pressure was distally from the temporarily occluded descending branch of left artery. From results these studies we conclude that: 1. The sympathetic cardiac nerves, as does levarterenol, increase myocardial contraction, (indicated a shorter, more abrupt systole rapid isometric relaxation), cause slight degree arteriolar dilation. 2. Parasympathetic fibers exert no significant effect, although acetylcholine diminishes tone may slightly diminish ventricular contraction. 3. That measurements mean flow resistance are relatively satisfactory for indicating changes in tone, but little value evaluating