A lateral wall myocardial infarction (MI) is associated with ST elevations in which leads?

A lateral wall myocardial infarction (MI) particularly involves the left lateral aspect of the heart, which is primarily supplied by the left circumflex artery. The ST elevations that indicate such an infarction occur in leads that view the lateral wall of the heart.

Leads I and aVL are positioned in such a way that they monitor the electrical activity of the heart from the lateral perspective. When there is an obstruction in the blood flow to the lateral wall due to a blockage in the left circumflex artery, these leads will show ST segment elevation because they are directly affected by the reduced blood supply to that area of the myocardium. This elevation is indicative of myocardial injury or infarction occurring in that specific region.

In contrast, other options involve leads that do not correspond to the lateral wall. For example, Lead II and III assess the inferior aspect of the heart; V1 and V2 focus on the anterior wall; whereas aVR and V5 do not correlate with the areas of infarction pertinent to the lateral wall of the heart.