Unipolar leads made by this method are prefixed by the letter V (which stands for voltage) followed by subscript numbers 1 to 6, which indicate the corresponding chest sites.
A lead taken by this method is called a unipolar lead.
Unipolar leads are designated by an upper case V on the ECG monitor and/or printout.
The final six leads in the standard 12-lead ECG are designated as the precordial leads and are also unipolar leads.
It is now over 100 years since the limb leads of the electrocardiogram (ECG) were introduced (1), 75 years since the unipolar chest leads were designed (2) though only 65 years since the precordial electrode positions were standardised (3) and approximately the same time since augmented unipolar leads
were introduced (4).
Approved in 2001, the Prime ECG uses 72 unipolar leads
placed in a vest-like distribution over the front, back, and sides of the patient's torso to obtain a three-dimensional view of cardiac electrical activity.
03) and in 12 unipolar leads
(V1-V8, V3R, VR, VL, VF) extracted from the map (0.