[Changes in coronary circulation following reflex excitation of the sympathetic nervous system]

The patterns and efferent mechanisms of coronary blood flow reactions in cats following sympathetic activation after hemorrhage and carotid occlusion, were studied. Like in other vascular regions, the sympathetic activation led to alpha-adrenergic coronary constriction which was particularly clear after blocking of neurogenic and metabolic vasodilatory factors (beta-blockers, atropine). The significance of myogenic constrictory component was elucidated as well.