What anatomical landmark is used for placing Lead V4?

The placement of Lead V4 is specifically done at the 5th intercostal space in line with the midclavicular line. This anatomical landmark is crucial because it allows for accurate monitoring of the heart's electrical activity from the precordial area, providing a view of the heart's anterior wall. Positioning V4 in this location helps in assessing potential abnormalities in the left ventricle and identifying conditions such as anterior myocardial infarctions. Proper placement at the 5th intercostal space ensures that the lead is optimally positioned to capture the heart's electrical signals for effective interpretation.