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Complications
By Mayo Clinic staffCases of mild to moderate pulmonary stenosis generally don't cause complications. However, severe pulmonary stenosis may be associated with the following:
- Infectious endocarditis. This is an inflammation of the inner lining of the heart caused by a bacterial infection. People with pulmonary stenosis are twice as likely as people in the general population to have this condition.
- Right ventricular hypertrophy. In pulmonary stenosis, the right ventricle must pump harder to force blood into the pulmonary artery. Pumping of the right ventricle against increased pressure causes the muscular wall of the ventricle to thicken (hypertrophy) and the chamber within the ventricle to enlarge. Eventually, the heart becomes stiff and may become weakened.
- Congestive heart failure. If the right ventricle becomes weak and unable to pump efficiently, congestive heart failure develops. This results in swelling of the legs and abdomen, and can also cause fatigue and shortness of breath.
- Arrhythmia. People with pulmonary stenosis are more likely to have an arrhythmia, or irregular heartbeat. Arrhythmias associated with pulmonary stenosis are usually not life-threatening unless the stenosis is severe.
