ECG Leads

The 12 conventional ECG leads
These 12 leads are divided into two groups:
 * six extremity (limb) leads; they are recording electrical potentials transmitted into the frontal plane;
 * six chest (precordial) leads, they are recording electrical potential transmitted into horizontal plane.

There are the leads with their location and polarity :

Additional ECG leads
These leads are used in special situations, when conventional 12-leads ECG can not reliably show the myocardial defect.

There are some examples of additional ECG leads :

Related articles

 * Electrocardiography
 * Electrocardiogram