A new electrocardiographic pattern indicating inferior myocardial infarction

Area of Science:

• Cardiology
• Electrocardiography
• Diagnostic Imaging

Background:

• A specific electrocardiogram (ECG) pattern without contiguous ST-segment elevation (STE) may indicate acute inferior myocardial infarction (MI) with concurrent critical stenoses in other coronary arteries.
• The frequency, anatomical basis, diagnostic accuracy, and prognostic significance of this ECG pattern require definition.

Purpose of the Study:

• To define the frequency, anatomical substrate, diagnostic power, and prognostic implications of a specific ECG pattern suggestive of acute inferior MI with multivessel coronary artery disease.

Main Methods:

• A study cohort of 2362 patients was analyzed, including those with non-ST-elevation MI (NSTEMI), inferior ST-elevation MI (STEMI), and no MI (no-MI).
• Coronary angiograms were reviewed by blinded interventional cardiologists. Echocardiographic and coronary angiography data were mapped.
• Patient mortality status was tracked via the national electronic database.

Main Results:

• The specific ECG pattern was identified in 6.3% of NSTEMI patients and 0.5% of no-MI patients.
• Patients exhibiting this pattern had larger infarct sizes, a higher frequency of culprit lesions, and more acute coronary occlusions compared to other NSTEMI patients.
• In-hospital and one-year mortality rates were similar between patients with this ECG pattern and those with inferior STEMI.

Conclusions:

• A novel ECG pattern has been defined, indicating inferior MI in patients with critical lesions in non-infarct-related coronary arteries.
• Patients presenting with this ECG pattern exhibit multivessel disease and are associated with increased mortality risk.