MI Complication (Peri-infarction Pericarditis) (1–3 days Post-MI)

Peri-infarction pericarditis is a condition that can occur shortly after a heart attack, affecting the protective sac around the heart called the pericardium. This inflammation usually develops within the first few days after the heart muscle is damaged. The main symptoms include chest pain that worsens with breathing or lying down and may improve when sitting up. It involves the cardiovascular system and can cause discomfort and sometimes complications if untreated. The inflammation results from irritation caused by the damaged heart tissue. This condition is important because it can mimic other serious problems and requires careful evaluation. Understanding this helps in managing symptoms and monitoring heart recovery.

Peri-infarction pericarditis is an inflammatory complication occurring within 1 to 3 days after an acute myocardial infarction (MI). It results from inflammation of the pericardium due to direct irritation by necrotic myocardial tissue and the release of inflammatory mediators. This condition is characterized by pericardial inflammation without significant pericardial effusion initially. It is distinct from Dressler syndrome, which occurs later and is autoimmune-mediated. Clinically, it presents with pleuritic chest pain, a pericardial friction rub, and characteristic ECG changes such as diffuse ST elevation and PR depression. The significance lies in its potential to cause diagnostic confusion with reinfarction and to contribute to pericardial complications.