NSTE- ACS: Pathogenesis

4 processes: 1- rupture of unstable atheromatous plaque 2- coronary arterial vasoconstriction 3- imbalance between the supply and demand of myocardium for oxygen 4- gradual intra-luminal narrowing of an epicardial coronary artery because of progressive atherosclerosis or post-stent restenosis can occur simultaneously in any combination