Copyright o The McGraw-Hil Companies, Inc. Per mission required for reproduction or display TABLE 12-2 Electrocardiography Leads NAME OF LEAD ELECTRODE PLACEMENT* Standard Limb Leads Reference(-) Electrode Recording(+)Electrode Lead I Right arm Left arm Lead II Right arm Left leg Lead Ill Left arm Left le Augmented Limb Leads Left arm and left leg Right arm VL Right arm and left le Left arm Right arm and left arm Left le Precordial (Chest)Leads Combined limb leads tth intercostal space, right of sternum 4 intercostal space, left of sternum 5 intercostal space, left of sternum V4 5 intercostal space, centered on clavicle 5 intercostal space, left of V4 V6 5 intercostal space, under left arm n all cases, the right leg is used as an electrical ground. Combining two electrodes forms a reference line between them: combining all limb leads forms a reference plane centered on the hear31