incidences of ventricular extrasystole observed at the maximal dosages of catecholamines , intravenous administration of 300 microgram/kg of dob , 3 of iso , 10 of epi , 10 of ne , and 300 of da , were 1/4 , 1/4 , 4/4 , 4/4 , and 2/4 , respectively .
C0007412
catecholamines
C0022245
iso