An electrocardiographic finding of a myocardial infarction that does not produce elevations in the ST segment of the EKG. [ NCI ]. The disease is Non-ST Elevation Myocardial Infarction (Experimental Factor Ontology term EFO_0008586). Also known as: NON-STEMI, NSTEMI, Non-ST Elevation Myocardial Infarction by ECG Finding, Non-ST Elevation Myocardial Infarction by EKG Finding.