An on an ECG refers to evidence of a myocardial infarction (heart attack) affecting the anterior (front) wall of the left ventricle. This is most commonly due to occlusion of the left anterior descending (LAD) artery —often called the “widow-maker” due to the large amount of myocardium at risk.
Here is the content you requested, organized for clinical recognition and understanding. The hallmark is ST-segment elevation in the anterior precordial leads (V1–V4), sometimes extending to V5, V6, and limb leads I and aVL. anterior infarct ecg