Hypertrophic obstructive cardiomyopathy

Hypertrophic obstructive cardiomyopathy was formerly known as subaortic muscular obstruction. In 1958, Teare described marked hypertrophy of the ventricular septum, with its thickness far exceeding that of the left ventricular free wall. The myocardial cells are thick and short, arranged in a disorganized manner, with abundant lateral connections between cells, termed asymmetric ventricular septal hypertrophy. After 1960, it was recognized as a type of primary cardiomyopathy, accounting for approximately 20% of all cardiomyopathies, and is therefore called idiopathic obstructive cardiomyopathy, idiopathic hypertrophic subaortic stenosis, or hypertrophic obstructive cardiomyopathy.