NCIt definition : A bipolar electrocardiogram limb lead which records the voltage between the negative
electrode on the right thoracic limb and the positive electrode on the left thoracic
limb.;
Alternative definition : CDISC: A bipolar electrocardiogram limb lead which records the voltage between the
negative electrode on the right thoracic limb and the positive electrode on the left
thoracic limb. (NCI);