Constrictive pericarditis is a chronic form of pericarditis in which the pericardium is rigid, thickened, scarred, and less elastic than normal. The pericardium cannot stretch as the heart beats, which prevents the chambers of the heart from filling. A direct consequence is a reduced cardiac output (the amount of blood pumped by the heart). The blood backs up behind the heart, resulting in symptoms of heart failure. The inflamed pericardium may cause pain when it rubs against the heart. The most common causes of constrictive pericarditis are conditions that induce chronic inflammation of the pericardium: tuberculosis, radiation therapy to the chest, and cardiac surgery. Less frequently, constrictive pericarditis results from mesothelioma (a tumor) of the pericardium or from incomplete drainage of abnomal fluid accumulating in the pericardial sac, which can occur in purulent pericarditis or in post-surgery hemopericardium (bleeding within the pericardial sac). Constrictive pericarditis may also develop without apparent cause.
The condition is relatively rare in children.
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