1. Acute pericarditis: acute inflammation of the visceral and parietal pericardium
-Causes: idiopathic, Coxsackie infx, trauma, uremia, MI, rheumatoid arthritis, SLE
-Findings: chest pain that increases with inspiration and is relieved by sitting up, pericardial friction rub
-Inflammation creates fibrinous exudate -> pericardium becomes dull, opaque, and "sandy"
2. Constrictive pericarditis
-Cause: tuberculosis, radiation therapy, or previous open heart surgery
-Findings: Kussmaul's sign, JVD, pericardial knock (heart beats against calcified pericardium)