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Subvalvular Aortic Stenosis
Subvalvular Aortic Stenosis Subvalvular aortic stenosis is a narrowing of the flow of blood below the aortic valve in the left ventricle. It is usually caused by a membrane or thickening in the muscle in this area.
RELATED TERMS--------------------------------------
Aortic
Pertaining to the aorta, the largest artery in the body.
Stenosis
The narrowing or constriction of a blood vessel or valve in the heart.
Blood
The life-maintaining fluid which is made up of plasma, red blood cells (erythrocytes), white blood cells (leukocytes), and platelets; blood circulates through the body's heart, arteries, veins, and capillaries; it carries away waste matter and carbon dioxide, and brings nourishment, electrolytes, hormones, vitamins, antibodies, heat, and oxygen to the tissues.
Valve
A fold in the lining of an organ that prevents fluid from flowing backward.
Ventricle
One of the two lower chambers of the heart.
Membrane
A flexible layer surrounding a cell, organelle (such as the nucleus), or other bodily structure. The movement of molecules across a membrane is strictly regulated in both directions.
Muscle
Tissue made up of bundles of long, slender cells that contract when stimulated.
SIMILAR TERMS--------------------------------------
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Status
Indicated degree of medical urgency for patients awaiting transplants.
Sternum (breastbone)
Bone in chest separated during open heart surgery.
Stress Test
See exercise stress test
Stroke (also called cerebral vascular accident or CVA)
Impaired artery blood flow to the brain. During a stroke, brain cells in the affected area are starved for oxygen and subsequently die.
Stunned Myocardium
If blood flow is returned to an area of heart muscle after a period of ischemia (lack of blood supply), the heart muscle may not pump normally for a period of days following the event. This is called "stunned" heart muscle or myocardium.
Subvalvular Aortic Stenosis
Sudden Cardiac Death
A sudden, unexpected death caused by loss of heart function. Most sudden cardiac deaths are caused by arrhythmias, such as ventricular fibrillation.
Superficial Thrombophlebitis
A clot in a superficial vein, just under the skin.
Survival Rates
Survival rates indicate the percentage of patients or grafts (transplanted organs) that are still alive functioning at a certain point posttransplant. Survival rates are often given at one-, three-, and five-year increments. Policy modifications are never made without examining their impact on transplant survival rates. Survival rates improve with technological and scientific advancements. Developing policies that reflect and respond to these advances in transplantation will also improve survival rates.
Systemic Circulation
The circulation of blood from the left ventricle, through an extensive network of vessels that penetrate every part of the body, to the right side of the heart.
Systolic Pressure
The pressure of the blood in the arteries when the heart pumps. It is the higher of two blood pressure measurements, e.g., 120/80, where 120 is the systolic pressure.
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