Chronic heart failure (HF) remains a condition with a very poor life prognosis. Implantable cardioverters defibrillators (ICD) are effective in sudden cardiac death (SCD) prevention in patients with reduced left ventricle ejection fraction (LVEF) ≤35%. Despite of over 30‑year clinical experience, more precise prognostic factors of malignant ventricular arrhythmias are still to be found. Only 30–40% of patients with ICD experience appropriate interventions; others do not benefit from the therapy but are prone to complications. Previous researches examining possible ventricular tachycardia and ventricular fibrillation prediction factors have not shown effective. Coronary artery disease is the most frequent cause of CHF, but still the relation of myocardial ischemia, coronary arteries angiographic morphology and the impact of chronic occlusion revascularization on ventricular arrhythmias is uncertain. Coronary artery total occlusion (CTO) seems to be a promising predictor of VT/VF, however further research is necessary to prove this thesis.