the chronotropic reactivity to beta-adrenergic stimulation was studied in isolated perfused hearts from sinoaortic baroreceptors denervated ( sad ) rats in the phases of maximal tachycardia ( 5 h ) and normalized heart rate ( 15 days ) or after repeated injection of isoproterenol ( 1 mg/kg , 3 times daily for 10 days ) .
C0039231
tachycardia
C0022245
isoproterenol