Which chest lead is located at the 5th intercostal space, left mid-axillary line?

The lead located at the 5th intercostal space along the left mid-axillary line is V6. This lead is part of the precordial leads used in electrocardiograms (ECGs) to provide important information about the electrical activity of the heart.

Specifically, V6 is positioned to capture the electrical impulses originating from the left side of the heart, allowing for a detailed assessment of left ventricular function and identifying aspects of potential pathologies such as left-sided heart conditions. Its placement at the mid-axillary line ensures that it is well-placed to detect any lateral wall abnormalities, making it crucial for comprehensive cardiac assessment.

Each of the other leads has specific anatomical landmarks, with V2 and V3 located more anteriorly and V5 being situated at the anterior axillary line, which does not correspond to the mid-axillary location of V6. Understanding the proper lead placements is essential for accurate interpretation of the ECG.