Overview
Clinical Meaning
The clinician managing MI must integrate molecular pathogenesis with evidence based reperfusion strategies and comprehensive post MI optimization.
CNPLE
CNPLE
The clinician managing MI must integrate molecular pathogenesis with evidence-based reperfusion strategies and comprehensive post-MI optimization. The Universal Definition of MI classifies five types: Type 1 (spontaneous MI from atherosclerotic plaque disruption), Type 2 (MI secondary to supply-demand mismatch from non-coronary causes), Type 3 (MI resulting in death before biomarkers obtained), Type 4 (MI related to PCI: 4a peri-procedural, 4b stent thrombosis, 4c restenosis), Type 5 (MI related to CABG). Type 1 MI involves plaque rupture (60-70%) or plaque erosion (30-40%) with subsequent thrombosis. Plaque erosion is increasingly recognized, particularly in younger women and smokers, and may warrant less aggressive antiplatelet therapy per emerging evidence (EROSION study). Reperfusion injury is a paradoxical consequence of successful reperfusion: restoration of blood flow to ischemic myocardium generates a burst of reactive oxygen species (superoxide, hydroxyl radicals), activates complement cascade, triggers neutrophil infiltration, causes calcium overload and hypercontracture (contraction band necrosis), and can produce microvascular obstruction (no-reflow phenomenon). Microvascular obstruction occurs in up to 50% of STEMI patients after primary PCI and predicts adverse remodeling. Ischemic postconditioning (brief cycles of ischemia/reperfusion during PCI) and...
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