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 higher than normal. Treatment involves eliminating the obstruction by a procedure called balloon valvuloplasty or by surgery.
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- 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 […]
- Stenotic
Narrowed, as in a stenotic artery. From the Greek “stenos” meaning narrow.
- Stent
A tube designed to be inserted into a vessel or passageway to keep it open. Stents are inserted into narrowed coronary arteries to help keep them open after balloon angioplasty. The stent then allows the normal flow of blood and oxygen to the heart. Stents placed in narrowed carotid arteries (the vessels in the front […]
- STEP procedure
Serial transverse enteroplasty.
- Step therapy
The practice of beginning drug therapy for a medical condition with the most cost-effective and safest drug therapy and progressing to other more costly or risky therapy, only if necessary. The aims are to control costs and minimize risks. Also called step protocol.