Lead V5 is placed at what location in an ECG?

• A. Midway between V2 and V4
• B. Fifth intercostal space, midclavicular line
• C. Anterior axillary line, same level as V4
• D. Midaxillary line, same level as V4

Answer: (C)

Lead V5 is situated at the anterior axillary line, at the same horizontal level as V4, which is located at the fifth intercostal space in the midclavicular line. This placement is significant because it helps capture the lateral wall of the left ventricle during an electrocardiogram (ECG). The correct positioning of V5 is essential for accurately assessing the electrical activity of the heart and identifying potential abnormalities.

In the context of the provided options, the reasoning for the other locations not being correct includes that V2 and V4 are not aligned at the anterior axillary line, but rather, they are positioned along the midclavicular line. Moreover, the fifth intercostal space does provide the correct vertical positioning for V4, but is not directly reflective of V5's lateral positioning aligned with the anterior axillary line. Thus, the anatomical reasoning for the placement solidifies the selection of the correct answer.