If you see deep, wide Q waves in V1–V4, the muscle has likely already died. This suggests the infarct is not brand new, or the patient presented late. However, in a "hyperacute" phase, Q waves can appear within hours.
An is the primary tool used to diagnose a heart attack affecting the front wall of the left ventricle. This type of myocardial infarction (MI) is typically caused by a blockage in the left anterior descending (LAD) coronary artery , often called the "widow-maker" due to the large amount of heart muscle at risk. anterior infarct ekg