ADRB2 and cardiomyopathy: The goal of this study was to determine whether combination of Fuzi and Banxia is incompatible in ADR-induced cardiomyopathy and to further explore underlying mechanisms by studying the echocardiogram and electrocardiogram (ECG) parameters, chemical markers, myocardial apoptosis, and the β2AR-coupled Gs and Gi signaling pathway.