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Complications could include:
Constrictive pericarditis is chronic inflammation of the pericardium, which is a sac-like membrane that surrounds the heart.
An abnormal heart rhythm (arrhythmia) is a change in the heart's beating pattern. There are many different types with different causes and effects. Possible symptoms are feeling faint, chest pain, and sweating.
An arrhythmia occurs when electrical impulses, which direct and regulate heartbeats, don't function properly. Heart arrhythmias are common and usually harmless.