Which chest lead is placed on the right sternal border in the 4th intercostal space?

The lead that is placed on the right sternal border in the 4th intercostal space is V1. This lead placement is part of the 12-lead ECG setup and is specifically designed to monitor the electrical activity of the heart by capturing the impulses from the right side of the heart.

Placing V1 at the right sternal border allows for the evaluation of the anterior wall of the heart as well as the septal area, which is crucial in identifying specific cardiac conditions and abnormalities. Proper placement of this lead is essential for accurate interpretation of the ECG, as it provides valuable information about the right ventricular and septal activity.

Other leads, such as V2, V3, and V4, are positioned in different locations on the chest to monitor electrical activity from various angles and regions. V2 is placed on the left sternal border, V3 is positioned between V2 and V4, while V4 is located in the left 5th intercostal space at the midclavicular line. Each lead has its specific placement and role in assessing heart function, making V1 distinctly positioned on the right sternal border for its unique purpose.