we have investigated the effects of catecholamines ( dopamine , norepinephrine , epinephrine and isoproterenol ) and tyramine on sinoatrial conduction time ( sact ) , sinus cycle length ( scl ) and developed tension ( dt ) in isolated atrial muscle , using an isolated and blood-perfused dog atrial preparation , perfused with heparinized blood from the carotid artery of the anesthetized donor dog .
C0007412
catecholamines
C0022245
isoproterenol