The constrictive consequences of pericardial calcifications.

A 53-year-old man presented with symptomatic severe pulmonary valve regurgitation. He underwent a diagnostic catheterization. A heavily calcified pericardium and the pressure tracings illustrate typical features of constrictive pericarditis physiology, including the "square root sign." This condition is important to recognize given the progressive nature and poor prognosis if untreated.