Intermediate Technical In the Industry Vocabulary Test

Subaortic Stenosis

Obstruction of left ventricular outflow below the aortic valve, typically caused by a membrane or muscular ridge.

Full Definition

Subaortic stenosis refers to obstruction of blood flow from the left ventricle to the aorta occurring below the aortic valve level. The most common form is discrete subaortic stenosis, caused by a fibromuscular membrane or ridge in the left ventricular outflow tract. Other forms include tunnel-type subaortic stenosis with longer segment narrowing, or dynamic obstruction from hypertrophic cardiomyopathy. Unlike valvular aortic stenosis, the aortic valve leaflets are typically normal, though chronic subaortic stenosis can lead to secondary aortic regurgitation.

Usage

Usage note: Always specify the location and type of stenosis to distinguish from valvular or supravalvular obstruction.

In Context

"The patient developed progressive subaortic stenosis requiring surgical membrane resection." — pre-operative assessment
"Echocardiography revealed discrete subaortic stenosis with a peak gradient of 45 mmHg across the membrane." — echocardiography report

Also known as

left ventricular outflow tract obstruction subvalvular aortic stenosis LVOTO

Contrasted with

subaortic patency unobstructed LVOT

Don't confuse with

aortic valve stenosis supravalvular aortic stenosis

Staged Reconstruction ← Back to glossary Supravalvular Aortic Stenosis