Table 1.

ECG background: the standard electrode configuration in the standard 12-lead ECG

Lead	Electrode Position
I	Left Arm, Right Arm
II	Left Foot, Right Arm
III	Left Foot, Left Arm
aVR	Right Arm
aVL	Left Arm
aVF	Left Foot
V1	4th intercostal space at the right sternal border
V2	4th intercostal space at the left sternal border
V3	Midpoint between V2 and V4
V4	5th intercostal space at the midclavicular line
V5	Lateral to V4, at the left midaxillary line
V6	Lateral to V5, at the left midaxillary line