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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Echocardiography uses sound waves to produce images of the heart. It is done for assessing the function of heart chamber and for detecting important complications. - See more at: http://nstemi.org/#.dpuf