Aortic Stenosis

Heart with Aortic Stenosis

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The aortic valve is the valve that separates the left ventricle from the aorta. Aortic stenosis refers to a narrowing of the aortic valve or a narrowing of the aorta directly above (supravalvar) or below (subvalvar) the valve.

This leads to abnormally high pressure in the left ventricle causing the left ventricular wall to thicken (hypertrophy). Treatment usually involves surgery, though it may be possible to stretch the valve with a balloon catheter. The catheter procedure, known as a balloon valvuloplasty, involves the insertion of a heart catheter through a vein in the leg leading to the heart.

A balloon at the tip of the catheter is placed across the valve and inflated to stretch open the stenotic valve. Most often, surgery involves repair of the existing valve. Valve replacement is not an ideal option for children because long-term mortality rates are high.


What is Normal Cardiac Anatomy?

When your child has a congenital heart defect, there's usually something wrong with the structure of his or her heart's structure.

 
Learn More About Normal Cardiac Anatomy

Heart with Normal Cardiac Anatomy

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When your child has a congenital heart defect, there's usually something wrong with the structure of his or her heart's structure.

The heart is composed of four chambers. The two upper chambers, known as atria, collect blood as it flows back to the heart. The two lower chambers, known as ventricles, pump blood with each heartbeat to the two main arteries (the pulmonary artery and the aorta). The septum is the wall that divides the heart into right and left sides. The atrial septum separates the right and left atria; likewise, the ventricular septum separates the two ventricles.

There are four valves that control the flow of blood through the heart. These flap-like structures allow blood to flow in only one direction. The tricuspid and mitral valves, also known as the atrioventricular valves, separate the upper and lower chambers of the heart. The aortic and pulmonary valves, also known as the arterial valves, separate the ventricles from the main arteries. Oxygen-depleted blood returns from the body and drains into the right atrium via the superior and inferior vena cavas. The blood in the right atrium then passes through the tricuspid valve and enters the right ventricle.

Next, the blood passes through the pulmonary valve, enters the pulmonary artery, and travels to the lungs where it is replenished with oxygen. The oxygen-rich blood returns to the heart via the pulmonary veins, draining into the left atrium. The blood in the left atrium passes through the bicuspid, or mitral, valve and enters the left ventricle.

Finally, the oxygen-rich blood flows through the aortic valve into the aorta and out to the rest of the body.