Lead	Positive Electrode Position	Negative Electrode Position	Heart Surface Viewed
I	Left Arm	Right Arm	Lateral
II	Left Leg	Right Arm	Inferior
III	Left Leg	Left Arm	Inferior

Lead	Positive Electrode Position	Heart Surface Viewed
AVR	Right Arm	None
AVL	Left Arm	Lateral
AVF	Left Leg	Inferior
V1	Right side of sternum, 4^th intercostal space	Septum
V2	Left side of sternum, 4^th intercostal space	Septum
V3	Midway between V2 & V4	Anterior
V4	Left midclavicular line, 5^th intercostal space	Anterior
V5	Left anterior axillary line at same level as V4	Lateral
V6	Left midaxillary line at Same level as V4	Lateral