What is the role of the right leg electrode in a 12 lead EKG?

The right leg electrode serves primarily as a ground in a 12 lead EKG setup. It helps reduce electrical interference and provides a reference point for the other electrodes positioned on the body. By being designated as the ground, it stabilizes the ECG reading and allows for an accurate assessment of the heart's electrical activity without the interference that can result from various external electrical signals.

In contrast, the other electrodes placed on the limbs and chest lead to the detection of the heart's electrical impulses and are responsible for determining the heart's rhythm, electrical activity, and overall function. While the ground electrode does not measure electrical activity directly, its presence is crucial for obtaining a clear and interpretable EKG reading.