Non-ST segment elevation myocardial infarction (NSTEMI) is a type of coronary artery disease that is associated with sudden rupture of plaque inside the coronary artery. This type of myocardial infarction (MI) does not cause changes on an electrocardiogram (ECG). However, chemical markers in the blood indicate that damage has occurred to the heart muscle. In NSTEMI, the blockage may be partial or temporary, and so the extent of the damage relatively minimal.

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