[Electrocardiogram changes in hypertrophic cardiomyopathy]

Eight versions of ECG alterations were identified in 84 patients with hypertrophic cardiomyopathy (HCMP). As for the most prevalent version (60.7 percent of the cases), the pathological Q waves or QS were recorded in the presence of the voltage signs of ventricular hypertrophy or without such signs. The use of ultrasound cardiography and roentgenocardiography made it possible to distinguish 3 groups of patients with different myocardial hypertrophy. The first group included 20 patients with isolated hypertrophy of the interventricular septum (IVS), the second group 40 patients with IVS and left ventricle hypertrophy, and the third group included 24 cases of IVS hypertrophy and combined hypertrophy of the ventricles. The main features of ECG alterations were determined in accordance with the types of hypertrophy under consideration. In the first group, Q waves were mainly recorded (in 71.4 percent of the cases). In the second group, the signs of left ventricle hypertrophy were recorded in 50 percent of the cases while Q/QS in 62.5 percent of the cases. In the third group, the voltage signs of ventricular hypertrophy were observed in 62.5 percent of the cases, whereas the Q and QS were recordable less commonly (in 41.7 percent of the cases).