Final answer:
A subaortic membrane (DSS) is located just below the aortic valve in the heart's left ventricular outflow tract, and it can lead to complications by causing an obstruction in blood flow.
Step-by-step explanation:
Location of a Subaortic Membrane (Discrete Subvalvular Aortic Stenosis)
A subaortic membrane (DSS), also known as discrete subvalvular aortic stenosis, is an abnormal fibrous or fibromuscular tissue ridge located just below the aortic valve in the left ventricular outflow tract. It is a form of congenital heart disease that can cause obstruction of blood flow from the left ventricle to the aorta. This can lead to several complications, including left ventricular hypertrophy due to the increased workload on the heart and aortic valve damage.
The membrane can vary in size and thickness, and its exact location is just beneath the aortic valve, in an area known as the subaortic region. This can interfere with the normal flow of blood through the heart and may require medical intervention, such as surgical removal, if it causes significant obstruction or symptoms.