during this period the number of patients with one or more of ventricular couplets , bigemini , ventricular tachycardia or early cycle premature ventricular contractions ( pvc ) ( i.e . complex ventricular arrhythmias ) and the average number of pvc per hour increased significantly in the placebo group but not in the timolol group .
C0042514
ventricular tachycardia
C0085612
ventricular arrhythmias