Which of the following corresponds to the anterior axillary line in lead placement?

• A. V2
• B. V5
• C. V4
• D. V3

Answer: (B)

The anterior axillary line is an important anatomical landmark used in placing electrodes for cardiac monitoring, particularly in a 12-lead ECG. In this context, the correct answer corresponds to electrode placement in relation to this line.

V5 is positioned at the anterior axillary line, specifically in the fifth intercostal space. V5 is crucial for obtaining a comprehensive view of the heart’s electrical activity, particularly from the left lateral perspective. This angle is essential for detecting potential events related to the left ventricle, such as ischemic changes.

The other lead options have distinct placements that do not align with the anterior axillary line. While V2, V3, and V4 are close to the midline of the chest, only V5 accurately correlates with the anterior axillary line focus during ECG electrode placement. Therefore, the placement of V5 correctly identifies the region associated with optimal cardiac electrical interpretation from this particular viewpoint.