Pericarditis is inflammation of the sac surrounding the heart, the pericardium. Acute pericarditis is the most common form of pericarditis.

American Heart Association - Gives an explanation for both pericardium and pericarditis. Brief discussion on who gets it, the causes and treatment.
Meta Description: [ What is the pericardium?
The pericardium is the thin sac (membrane) that surrounds the heart and the roots of the great blood vessels. ]
Medstudents-Cardiology - A review of the basic and clinical characteristics of constrictive pericarditis. Including analysis of surgical treatment and long term outcome.
Meta Description: [ A review of the basic and clinical characteristics of
Constrictive Pericarditis, including analysis of surgical treatment and long term outcome. ]
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Methodist Health Care System - An explanation of pericarditis as well as causes, symptoms and treatment.
Mount Sinai School of Medicine - A look at acute, chronic, constrictive, adhesive, viral, bacterial, fungal and uremic pericaditis. The causes, diagnosis, and treatment.
Meta Description: [ The Zena and Michael A. Wiener Cardiovascular Institute and The Marie-Josée and Henry R. Kravis Center for Cardiovascular Health integrates Mount Sinai's vast strength and resources in adult and pediatric cardiology and related disciplines, focusing on superb clinical patient care, novel clinica... ]
Penn State Cardiovascular Center: Patient Education - Explanation as well as discussion on causes, diagnosis, symptoms and treatment of pericarditis.
Pericardial Disease - The Merck Manual discusses both acute and chronic pericarditis. Looks at signs, symptoms, diagnosis and treatment of both.