Serial Electrocardiographic Changes in Early Post-myocardial Infarction Pericarditis.

A 72-year-old man developed fever and chest pain, accompanied by an increase in C-reactive protein, four days after successful emergency catheter intervention for an acute wide anterior myocardial infarction (MI). A twelve-lead electrocardiogram (ECG) showed marked ST elevation in leads V1-6, I, and aVL, with reciprocal ST depression in leads II, III, and aVF. Although these ECG changes improved by day three, he developed fever and chest pain on day four, and an ECG at this timepoint showed ST elevation in leads II, III, aVF, and mild worsening of the ST elevation in the anterolateral leads, indicating diffuse ST-segment elevation consistent with acute pericarditis.