a therapeutic response , defined as the minimum percentage reduction in ventricular arrhythmias to demonstrate an effect due to atenolol rather than spontaneous variation , was achieved in up to 70 % of patients for total number of ectopic beats , 75 % for ectopic couplets , and 73 % for ventricular tachycardia beats .
C0085612
ventricular arrhythmias
C0042514
ventricular tachycardia