Progressive Care Nursing Certification (PCCN) Practice Exam

Which ECG leads show changes associated with an inferior wall STEMI?

1. II, III, aVF

2. V4, V5, V6

3. II, III, aVR

4. V1, V2, V3

The correct answer is: II, III, aVF

The correct choice reflects the standard leads that are indicative of an inferior wall ST-Elevation Myocardial Infarction (STEMI). In an inferior wall STEMI, changes such as ST-segment elevation can typically be observed in leads II, III, and aVF. These leads correspond to the inferior wall of the heart, which is supplied by the right coronary artery in most individuals. When interpreting an ECG, observing ST elevation in these leads is crucial for identifying an inferior wall MI, as it suggests that the blood supply to that area of the heart is compromised. In contrast, other options represent leads that are associated with different areas of the heart. For instance, V4, V5, and V6 primarily monitor the lateral wall of the heart and would not reflect changes related to an inferior wall STEMI. The combination of II, III, and aVR involves one lead (aVR) that does not contribute to the inferior wall assessment but rather provides information on right-sided heart activity or global ischemia. Lastly, V1, V2, and V3 are associated with the anterior wall and septal regions, which again would not reflect changes from an inferior wall STEMI. Thus, understanding the specific leads that indicate