Hypertrophic cardiomyopathy
In this case, it is not a problem in the heart valves but the heart muscle, which becomes enlarged and thick. The ventricles are usually severely taken by the disease, and the available space is reduced. It is often associated with valve changes and stiffness of the left ventricular area. In these cases, the murmur is a late systolic heart murmur with a harsh sound located at the apex of the heart. It increases with the patient sitting down and decreases with squatting.