However, some people with non-ST elevation myocardial infarction (NSTEMI) have a total blockage. A partial blockage often means you've had a non-ST elevation myocardial infarction (NSTEMI).An acute complete blockage of a medium or large heart artery usually means you've had an ST elevation myocardial infarction (STEMI).Your health care provider may use electrocardiogram (ECG) results to describe these types of heart attacks. One way to classify heart attacks is whether an electrocardiogram (ECG or EKG) shows some specific changes (ST elevation) that require emergency invasive treatment. If a plaque breaks open, it can cause a blood clot in the heart.Ī heart attack may be caused by a complete or partial blockage of a heart (coronary) artery. Plaques can narrow the arteries, reducing blood flow to the heart. This is usually due to cholesterol-containing deposits called plaques. In coronary artery disease, one or more of the heart (coronary) arteries are blocked. Coronary artery disease causes most heart attacks.

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