an in situ experimental study of the heart has demonstrated that verapamil++ ( 0.3 mg/kg ) , administered intravenously to dogs with complete transverse heart block one day after two-step occlusion of the left descending coronary artery either produced a 15-30 % drop in the incidence of abnormal ventricular activity ( ava ) in some experiments , or had no effect on the latter in others .
C0018787
heart
C0018827
ventricular