these results suggest that : ( 1 ) increasing vagal tone above the level existing after acute myocardial infarction does not decrease mortality , ( 2 ) propranolol pretreatment does not affect the incidence of ventricular fibrillation induced by coronary occlusion , ( 3 ) the duration of the arrhythmia after coronary occlusion is effectively shortened with propranolol , and ( 4 ) cardiac beta-adrenergic receptors do not appear to be involved in the decreases in heart rate , blood pressure , and contractile force seen with coronary occlusion .
C0155626
acute myocardial infarction
C0018787
cardiac