Aortic Valve Stenosis
Revising Medical Author: Daniel
Kulick, MD, FACC, FSCAI
Revising Medical Editor: William C. Shiel Jr., MD, FACP, FACR
What is aortic stenosis?
Aortic stenosis is abnormal narrowing of the aortic valve. A number of conditions cause disease resulting in narrowing of the aortic valve. When the degree of narrowing becomes significant enough to impede the flow of blood from the left ventricle to the arteries, heart problems develop.
The basic mechanism is as follows:
- The heart is a muscular pump with
four chambers and four heart valves.
- The upper chambers, the right
atrium and left atrium (atria - plural for atrium), are thin walled
filling chambers.
- Blood flows from the right and left atria across
the tricuspid and mitral valves into the lower chambers (right
and left ventricles).
- The right and left ventricles have thick
muscular walls for pumping blood across the pulmonic and aortic
valves into the circulation.
- Heart valves are thin leaflets of
tissue which open and close at the proper time during each heart
beat cycle.
- The main function of these heart valves is to prevent
blood from flowing backwards.
- Blood circulates through the arteries to provide oxygen and other nutrients to the body, and then returns with carbon dioxide waste through the veins to the right atrium; when the ventricles relax, blood from the right atrium passes through the tricuspid valve into the right ventricle.
- When the ventricles contract, blood from the right ventricle is pumped through the pulmonic valve into the lungs to reload on oxygen and remove carbon dioxide.
- The oxygenated blood then returns to the left atrium and passes through the mitral valve into the left ventricle.
- Blood is pumped by the left ventricle across the aortic valve into the aorta and the arteries of the body.
The flow of blood to the arteries of the body is impaired when aortic stenosis exists. Ultimately, this can lead to heart failure. Aortic stenosis occurs three times more commonly in men than women.
Next: What causes aortic stenosis? »
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