The pericardium is the fibroelastic sac that covers the heart. Besides acting as a protective barrier, it also affects cardiac hemodynamics. Constrictive pericarditis is a condition in which granulation tissue formation in the pericardium results in loss of pericardial elasticity leading to restriction in the ventricular filling. It is usually a chronic condition however subacute, transient and occult variants have been described.
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