Background: To evaluate the changes in autonomic neural control mechanisms before malignant ventricular arrhythmias. we measured heart rate variability (HRV) and heart rate turbulence (HRT) in patients with ventricular tachycardia or fibrillation (Group I; n=6). non sustained ventricular tachycardia (Group II; n=32). frequent premature ventricular beats (Group III; n=26) and with ICD ... https://www.lorenametaute.com/