| LOCATION
OF ELECTRODES AND LEAD CONNECTIONS FOR THE STANDARD 12-LEAD ELECTROCARDIOGRAM
| |
LEAD POSITIVE INPUT |
NEGATIVE INPUT |
| BIPOLAR
LIMB LEADS |
|
|
| Lead I |
Left arm |
Right arm |
Lead II
|
Left leg |
Right arm |
| Lead III |
Left leg |
Left arm |
AUGMENTED UNIPOLAR LIMB LEADS |
|
|
| aVr |
Right arm |
Left arm + left leg |
| aVl |
Left arm |
Right arm + left leg |
| aVf |
Left leg |
Left arm + left arm |
| PRECORDIAL
LEADS |
|
|
V1 |
Right sternal margin,4th intercostal space |
Wilson central terminal |
| V2 |
Left sternal margin,4th intercostal space |
Wilson central terminal |
V3 |
Midway between V2 and V4 |
Wilson central terminal |
| V4 |
Left midclavicular line,5th intercostal space |
Wilson central terminal |
| V5 |
Left anterior axillary line |
Wilson central terminal |
V6 |
Left midaxillary line |
Wilson central terminal |
|
EKG Patient Lead Placement