one hundred and thirty nine patients aged 16 to 84 years , with and without severe ventricular arrhythmias ( ventricular tachycardia , vt , and fibrillation , vf ) were divided into two groups after clinical , echocardiographic and 24 hour holter investigations : group i comprised 26 patients with a least one documented attack of vt or vf ;
C0085612
ventricular
C0042510
vf