Definition and related terms in Pericarditis, an infection (from a bacterium, a fungus, Systemic Lupus Erythematosus (SLE), etc.) inflames the pericardium. there may or may not be pericardial effusion or constrictive pericarditis. dressler's Syndrome, also called postmyocardial infarction syndrome, is a combination of pericarditis, pericardial