MI Complications — Time Course

0–24 hours: • Cardiogenic shock, ventricular arrhythmias, sudden death • Coagulative necrosis starting 1–3 days: • Acute fibrinous pericarditis (early "post-MI pericarditis") • Neutrophilic infiltrate 3–14 days (highest rupture risk): • Free wall rupture → cardiac tamponade • Papillary muscle rupture → acute mitral regurgitation, pulmonary oedema • Septal rupture → VSD with new holosystol…