during long-term ecgs , nine of 10 patients with systolic wall stress of greater than or equal to 300 dyn x 10 ( 3 ) /m2 showed ryan 's class 4a or 4b ventricular arrhythmias or ventricular tachycardia during programmed ventricular stimulation .
C0085612
ventricular arrhythmias
C0042514
ventricular tachycardia