ECG plays a predominantly screening role in cardiomyopathies. It is particularly important in hypertrophic cardiomyopathies, where atrial abnormities may be present (25 %), positive voltage criteria in hypertrophy of the left ventricle (63 %), pathological Q or QS wave (24 %), missing septal q in V5 and V6 (49 %), missing increase in the R wave in V1 - V3 (29 %) and high R waves in V2 – V3 (15 %), changes in repolarization phase of the ST-T segment (87 %). The left Tawar arm blockade is particularly typical for dilatation cardiomyopathies. In arrhythmogenic cardiomyopathies of the right ventricle the epsilon ware can be found as well as negative T waves in the leads from the right precordium and ventricular arrhythmias in the shape of the left Tawar arm blockade.

        Key words: Hypertrophic cardiomyopathy - Voltage criterai in hypertrophy of the left ventricle - Dilatation cardiomyopathy - Arrhythmogenic cardiomyopathy of the right ventricle - Restrictive cardiomyopathy