Constrictive pericarditis is a condition in which the pericardial sac loses its normal elasticity, and begins to restrict the heart's ability to fill with blood. Since the filling of the heart is restricted, the amount of blood the heart can pump with each beat is reduced. Symptoms of palpitations, weakness and fatigue, and shortness of breath often occur. If the constriction is severe, liver failure can eventually result.
Read about constrictive pericarditis - its causes, its diagnosis, and its treatment.