results of the electrocardiographic studies in heavy rats , using the calculated ld20 dosage of isoproterenol with or without pretreatment of aminophylline , demonstrated that both mortality and the arrhythmia-inducing effect of isoproterenol were significantly potentiated by aminophylline but only mortality was increased in small rats .
C0003811
arrhythmia
C0002575
aminophylline