CHARACTERISTICS OF VENTRICULAR ARRHYTHMIAS IN CHRONIC HEART FAILURE WITH REDUCED LEFT VENTRICULAR EJECTION FRACTION Investigating ventricular arrhythmias (VAs) in 205 patients with chronic heart failure due to hypertension, ischemic heart disease and idiopathic dilated cardiomyopathy by using 24 hour Holter monitoring, in Department of Cardiology - Hospital 103, from 1.2012 to 12.2014.