Topic summary
ECG
Extracted from the Wikipedia article Electrocardiography.
12-lead ECG
Leads are grouped in three categories: limb; augmented limb; and precordial or chest. A 12-lead ECG has a total of three limb leads and three augmented limb leads arranged like spokes of a wheel in the coronal plane (vertical), and six precordial leads or chest leads that lie on the perpendicular transverse plane (horizontal).