Constrictive Pericarditis and Restrictive Cardiomyopathy Both disorders present with signs of right-sided heart failure and preserved systolic function, yet their pathophysiology, causes, and treatment are quite different. --- Constrictive Pericarditis (CP) Definition: A chronic condition where the pericardium becomes fibrotic, thickened, and sometimes calcified, leading to loss of its elasticity and restriction of diastolic filling. Causes: Idiopathic or post-viral (most common in developed cou