the difference in potency of propranolol and practolol , demonstrated by their effect on isoprenaline induced tachycardia at doses shown to have equal effects on exercise tachycardia , is contributed to but not fully explained by the reflex withdrawal of cardiac vagal tone which occurs with cardioselective but not non-selective antagonists .
C0022245
isoprenaline
C0039231
tachycardia