Definition Mitral stenosis is a heart valve disorder that involves the mitral valve. This valve separates the upper and lower chambers on the left side of the heart. Stenosis refers to a condition in which the valve does not open fully, restricting blood flow. Alternative Names Mitral valve obstruction Causes, incidence, and risk factors Blood that flows between different chambers of your heart must flow through a valve. The valve between the two chambers on the left side of your heart is called the mitral valve. It opens up enough so that blood can flow from one chamber of your heart (left atria) to the next chamber (left ventricle). It then closes, keeping blood from flowing backwards. Mitral stenosis refers to when the valve cannot open as wide. As a result, less blood flows to the body. The upper heart chamber swells as pressure builds up. Blood may flow back into the lungs. Fluid then collects in the lung tissue ( pulmonary edema ), making it hard to breathe. See also: heart failure . In a...
Definition Meatal stenosis is a narrowing of the opening of the urethra, the tube through which urine leaves the body. Alternative Names Urethral meatal stenosis Causes, incidence, and risk factors Meatal stenosis can affect both males and females, but it is more common in males. In males, it is often caused by swelling and irritation (inflammation) after a newborn is circumcised . This leads to abnormal tissue growth and scarring across the opening of the urethra. The problem is usually not found until the child is toilet trained. In females, this condition is present at birth (congenital). Although less common, metal stenosis may also affect adult women. Risks include: Having multiple endoscopic procedures ( cystoscopy ) Severe, long-term atrophic vaginitis
Pulmonary valve stenosis is a heart valve disorder that involves the pulmonary valve.
This valve separates the right ventricle (one of the chambers in the heart) and the pulmonary artery. The pulmonary artery carries oxygen-poor blood to the lungs.
Stenosis occurs when the valve cannot open wide enough. As a result, less blood flows to the lungs.
Valvular pulmonary stenosis; Heart valve pulmonary stenosis; Pulmonary stenosis; Stenosis - pulmonary valve; Balloon valvuloplasty - pulmonary
Causes, incidence, and risk factors
Narrowing in the pulmonary valve is usually present at birth (congenital). It is caused by a problem that occurs when the unborn baby (fetus) is developing. The cause is unknown, but genetics may play a role.
Narrowing that occurs in the valve itself is called pulmonary valve stenosis. There may also be narrowing just before or just after the valve.
The defect may occur alone or with other cong...
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