How is an NSTEMI typically characterized on an electrocardiogram?

An NSTEMI, or Non-ST-Elevation Myocardial Infarction, is characterized by the absence of ST-segment elevation on the electrocardiogram (ECG). This condition signifies that there is a partial blockage of the coronary artery, leading to myocardial ischemia, but not enough damage to cause the significant changes associated with ST-segment elevation seen in a STEMI (ST-Elevation Myocardial Infarction).

On the ECG, patients with NSTEMI often show results such as ST-segment depression or T-wave inversions rather than an elevation of the ST segment. This distinguishing feature is crucial for diagnosis, as it helps healthcare providers to differentiate NSTEMI from other types of myocardial infarctions that display more severe ischemic effects reflected in the ECG. The ability to identify NSTEMI based on these ECG findings is foundational in determining the appropriate treatment and management strategies for patients experiencing myocardial ischemia.