Answer by
Gigi23 (139)
Idiopathic hypertrophic subaortic stenosis (IHSS)is a rare heart disease affecting the left ventricle of the heart. It is now typically referred to as HOCM: Hypertrophic Obstructive CardioMyopathy. This condition is hereditary and causes the heart muscle to harden and blood to the left ventricle to be blocked. There are several treatments for this type of heart disease.