Which electrode shows no cardiac information and serves as a ground electrode?

The right leg electrode is recognized as a ground electrode in an EKG setup. It does not contribute any cardiac data or readings related to electrical activity from the heart itself. Instead, its primary purpose is to minimize electrical interference and establish a stable baseline for the EKG machine. This helps ensure that the readings obtained from the electrodes that are positioned at the limbs and chest are accurate and reliable.

In an EKG, the other electrodes placed on the patient's limbs and chest are specifically designed to capture electrical signals generated by the heart as it beats. Each of these electrodes has a designated role in creating the heart's electrical vector and capturing the necessary data for diagnostic interpretation. The right leg electrode, by contrast, is solely utilized for grounding, allowing for more precise measurements from the other electrodes.