Stem cell harvest, peripheral blood
A technique for obtaining stem cells from the patient’s blood for use in bone marrow transplantation. They are lured out of the bone marrow by a special regimen of drugs. The blood is then filtered through a machine, and the stem cells are skimmed off. They can be used right away or stored in liquid nitrogen until needed. Also known as apheresis.
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- Stem cells
One of the human body’s master cells, with the ability to grow into any one of the body’s more than 200 cell types. All stem cells are unspecialized (undifferentiated) cells that are characteristically of the same family type (lineage). They retain the ability to divide throughout life and give rise to cells that can become […]
- Stenosis
A narrowing. For example, aortic stenosis is a narrowing of the aortic valve in the heart.
- Stenosis, aortic
Narrowing (stenosis) of the heart valve between the left ventricle of the heart and the aorta. This narrowing impedes the delivery of blood through the aorta to the body and makes it tough for the heart to carry out this Herculean task. A normal aortic valve has three leaflets or cusps, but a stenotic valve […]
- Stenosis, pulmonary
A condition in which the pulmonary valve is too tight, so that the flow of blood from the right ventricle of the heart into the pulmonary artery is impeded. This means that the right ventricle must pump harder than normal to overcome the obstruction. Treatment is necessary if the pressure in the right ventricle is […]
- Stenosis, subaortic
Narrowing of the left ventricle of the heart just below the aortic valve through which blood must pass on its way up into the aorta. The narrowing cuts the flow of blood. Subaortic stenosis may be congenital (present at birth) or acquired as part of a particular form of heart disease known as “idiopathic hypertrophic […]