Which leads are indicative of an inferior STEMI?

The indication of an inferior STEMI is primarily associated with leads that reflect the electrical activity and ischemia occurring in the inferior wall of the heart, primarily supplied by the right coronary artery in most people.

The correct choice, which includes leads II, III, and aVF, directly corresponds to this region. Lead II observes the electrical activity as it travels towards the foot and captures inferior signals effectively. Lead III complements this by also looking at the inferior wall, while aVF provides a grounding reference that helps visualize the inferior wall's activity. These leads collectively demonstrate the presence of ST-segment elevation that characterizes inferior STEMIs.

In contrast, other combinations of leads provided in the options do not effectively identify the inferior wall. For example, leads I, II, and aVL focus more on the lateral and superior aspects of the heart. Similarly, leads I, aVR, and V1 are associated predominantly with the anterior aspect and right-sided views, while leads III, aVL, and V3 cover other areas and fail to concentrate on the specific inferior view necessary for diagnosing an inferior STEMI.

Thus, selecting leads II, III, and aVF accurately captures the inferior myocardial ischemia that is critical in diagnosing an inferior STEMI.