NSTEMI occurs by developing a complete occlusion of a minor coronary artery or a partial occlusion of a major coronary artery previously affected by atherosclerosis. This causes a partial thickness damage of heart muscle.
There is no difference between NSTEMI and STEMI in clinical presentation. In both cases, patients usually present with similar type of symptoms such as chest pain, nausea, vomiting, sweating, breathing difficulty.
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Complications occur both in cases. But some complications like cardiogenic shock, left ventricular failure, severe mitral regurgitation due to papillary muscle rupture, cardiac tamponade due to ventricular wall rupture are more in STEMI (due to full thickness heart muscle damage) than NSTEMI.