Electrocardiograms in Acute Pericarditis

The pericardium surrounds the heart and consists of a visceral layer, which is contiguous with the epicardium of the heart, and a parietal layer, which forms a sac around the heart (Wann & Passen, 2008). Located between the parietal and visceral layers is a potential space called the pericardial cavity. The pericardial cavity normally contains as much as 50 mL of an ultrafiltrate of plasma. Anatomically, the pericardium isolates the heart from the rest of the mediastinum and thorax. Physiologically and under normal circumstances, the pericardium may have little if any significant role. The pericardial structure and function may be impacted by numerous pathologic conditions. Many of these conditions are listed in Table 1. A common and nonspecific condition affecting the pericardium is acute pericarditis. Acute pericarditis is a clinical syndrome that may present with chest pain, a pericardial friction rub, and gradual repolarization changes in the electrocardiogram (ECG). The diagnosis of acute pericarditis requires at least 2 of these 3 elements (Imazio et al, 2003)