AEMCA Practice Exam

Which leads are identified as inferior leads on a 12-lead ECG?

1. V1 and V2

2. ll, lll, and avF

3. V3 and V4

4. I and aVL

The correct answer is: ll, lll, and avF

The identification of inferior leads on a 12-lead ECG is crucial for interpreting heart conditions, particularly in the context of coronary artery disease. The inferior leads consist of leads II, III, and aVF. These leads provide information about the electrical activity of the heart from the inferior portion, or the lower part, of the heart. Leads II and III monitor the electrical activity that travels downward from the heart's apex, while lead aVF (augmented Vector Foot) specifically looks at the electrical activity directed toward the foot, effectively encompassing the inferior wall of the left ventricle. These leads are significant for diagnosing inferior myocardial infarctions or assessing other conditions related to the inferior wall of the heart. Other choices refer to different regions or views of the heart. For example, leads I and aVL focus more on the lateral aspect, while leads V1 and V2 are primarily concerned with the anterior wall of the heart and are useful in assessing different types of cardiac anomalies. Understanding these distinctions is vital in a clinical context, especially when diagnosing and managing cardiac events.