Where is the V4 electrode placed for a 12 lead ECG?

The V4 electrode is placed at the fifth intercostal space, midclavicular line. This specific location ensures accurate monitoring of the heart's electrical activity from the anterior perspective, particularly focusing on the left ventricle. Proper placement is essential for diagnosing conditions such as myocardial infarctions.

The fifth intercostal space is found below the fourth rib, while the midclavicular line runs vertically down from the midpoint of the clavicle, allowing for a standardized placement across different patients. This placement is corroborated by guidelines for 12-lead ECG placements, which aim to provide a comprehensive view of the heart's electrical conduction and myocardial status.

This is why the placement at this specific location is critical for the V4 electrode, ensuring reliable and reproducible results in ECG interpretation.