Augmented Limb Leads

In this image, the leads are from a calculated negative electrode to a positive physical electrode. Although the image shows the position of the negative electrode as central, the electrical signal is "augmented" by using the midpoint of the 2 electrodes not used as the positive electrode. For example, the augmented voltage right arm (aVR) lead uses the right arm (RA) electrode as the physical positive electrode and the midpoint of the left arm (LA) and left leg (LL) electrode as the calculated negative electrode.

aVL = augmented voltage left arm; aVF = augmented voltage left foot.