Acute epicardial Coronary artery Occlusion Myocardial infarction (
#ACOMI): this is going to be highlighted as the subset of
#ACS needing immediate
#PCI regardless what
#EKG shows…persisting symptoms, increasing
#Troponin &
#echofirst (regional LV contraction impairment) pivotal
The STEMI vs NSTEMI paradigm may be missing the real target.
Occlusion Myocardial Infarction (OMI) refers to an acute myocardial infarction caused by a culprit coronary artery that is completely or nearly completely occluded, resulting in critically reduced blood flow to the myocardium. In simple terms, OMI identifies the patients who need urgent reperfusion because an artery is blocked, regardless of whether the ECG fulfills STEMI criteria.
A 2024 study of 334 ACS patients found that 40% of OMI patients did NOT meet STEMI criteria. Despite having an acutely occluded coronary artery, these patients were often classified as NSTEMI and experienced major delays in treatment.
Among STEMI-negative OMI patients, only 11% underwent PCI within the first 12 hours, compared with 77% of STEMI-positive OMI patients.
The concerning part is that both groups had remarkably similar disease severity:
🔺 Similar rates of PCI
🔺 Similar rates of mechanical complications
🔺 Similar rates of electrical complications
🔺 Similar angiographic evidence of acute coronary occlusion
In other words, many patients without classic ST-elevation had the same dangerous pathology that traditionally prompts emergency cath lab activation.
The authors argue that focusing solely on STEMI criteria can cause clinicians to miss a substantial number of patients with acute coronary occlusion. Instead, ECG interpretation should focus on identifying OMI patterns, including hyperacute T waves, de Winter pattern, posterior MI, reciprocal changes, modified Sgarbossa criteria, and other STEMI equivalents.
The artery does not care whether the ECG meets STEMI criteria.
Time is myocardium. The goal is not simply to find ST elevation. The goal is to identify acute coronary occlusion and restore blood flow before irreversible myocardial injury occurs.
Perhaps it is time to shift the conversation from STEMI vs NSTEMI to what truly matters: OMI vs NOMI.