unipolar lead


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Related to unipolar lead: precordial leads

unipolar lead

An electrocardiographic lead in which one electrode is placed over the precordium, and the other over a different region of the body, e.g., a leg or the lower abdomen.
See also: lead
References in periodicals archive ?
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.
The final six leads in the standard 12-lead ECG are designated as the precordial leads and are also unipolar leads. These leads view the transverse plane of the body from anterior to posterior.
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).