lead2(redirected from precordial l's)
1. in electrocardiography, a specific array (pair) of electrodes used in recording changes in electric potential, created by the activity of an organ, such as the heart (electrocardiography) or brain (electroencephalography); applied also to the particular segment of the tracing produced by the potential registered through the specific electrodes; in electrocardiography, lead I records the potential differences between the two forelimbs, lead II between the right forelimb and left hindlimb, and lead III between the left forelimb and left hindlimb, and a fourth lead from various sites over the chest.
2. for attachment to a collar to facilitate walking a dog.
an array involving two electrodes placed at different body sites.
one attached to an electrode inserted in the esophagus.
see challenge feeding.
those placed within the body, e.g. esophageal and intracardiac leads. They may be more useful in identification of certain arrhythmias and in pacing the heart for diagnostic and therapeutic purposes.
measures three axes, left to right, head to tail, and vertebral column to sternum.
leads recording electric potential from various sites over the heart, designated V with a subscript numeral indicating the exact site.
the time that must elapse between coming to a decision and actually putting the decision into operation.
an array of two electrodes, only one of which transmits potential variations.