You are in Member Communities . Thanks Laurie for your input.
Different leads are simply different ways of looking at the same phenomenon.
During the procedure, a technician will attach 10 electrodes with adhesive pads to the skin of your chest, arms and legs. Men may have chest hair shaved to allow a better connection. You will lie flat while the computer creates a picture, on graph paper, of the electrical impulses traveling through your heart. This same test may also be used to monitor your heart during exercise. It takes about 10 minutes to attach the electrodes and complete the test, but the actual recording takes only a few seconds.