Nonobstructive (not causing difficulties for the movement of blood inside the heart) is characterized by an increase in heart size due to the thickening of the walls of the left ventricle, less often only the apex of the heart. Noise may be heard. With hypertrophy of the interventricular septum with a narrowing of the outflow pathways from the left ventricle (obstructive form), pain occurs behind the sternum, dizziness with a tendency to fainting, paroxysmal nocturnal dyspnea, loud systolic murmur. Arrhythmias and intracardiac conduction disorders (blockade) are frequent. Progression of cardiomyopathies leads to heart failure. On the electrocardiogram, signs of left ventricular hypertrophy are detected, sometimes the changes resemble those of myocardial infarction ("infarct-like" ECG).