lead (lēd) any of the conductors connected to the electrocardiograph, each comprising two or more electrodes that are attached at specific body sites and used to examine electrical activity by monitoring changes in the electrical potential between them.
unipolar lead
lead I the standard bipolar limb lead attached to the right and left arms.
lead II the standard bipolar limb lead attached to the right arm and left leg.
lead III the standard bipolar limb lead attached to the left arm and left leg.
augmented unipolar limb lead a modified unipolar limb lead; the three standard leads are: aVF (left leg), aVL (left arm), and aVR (right arm).
aVF lead an augmented unipolar limb lead in which the positive electrode is on the left leg.
aVL lead an augmented unipolar limb lead in which the positive electrode is on the left arm.
aVR lead an augmented unipolar limb lead in which the positive electrode is on the right arm.
bipolar lead an array involving two electrodes placed at different body sites.
limb lead an array in which any registering electrodes are attached to limbs.
pacemaker lead , pacing lead the connection between the heart and the power source of an artificial cardiac pacemaker.
precordial leads leads in which the exploring electrode is placed on the chest and the other is connected to one or more limbs; usually used to denote one of the V leads.
standard leads the 12 leads used in a standard electrocardiogram, comprising the standard bipolar limb leads I–III, the augmented unipolar limb leads, and the standard precordial leads.
unipolar lead an array of two electrodes, only one of which transmits potential variation.
V leads the series of six standard unipolar leads in which the exploring electrode is attached to the chest, designated V1 to V6. 
)
Positioning of V leads.
XYZ leads leads used in one system of spatial vectorcardiography.
unipolar lead (l d)n. 1. A lead of an electrocardiograph in which one electrode is placed on the chest in the vicinity of the heart or on one of the limbs, while the other is placed at an area of zero potential. 2. A record obtained from such a lead. |
unipolar lead
Etymology: L, unus + polus, pole; AS, laedan, to lead
1 an electrocardiographic conductor in which the exploring electrode is placed on the precordium or a limb while the indifferent electrode is in the central terminal.
2
Usage notes: informal.
a tracing produced by such a lead on an electrocardiograph. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content.
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