In: Anatomy and Physiology
Bipolar leads provides pictures of the frontal plane of the heart.
The frontal plane consists of :- Right to left directions/ Left to Right directions/ Superior to Inferior / Inferior to Superior direction.
A lead composed of two electrodes of opposite polarity is called bipolar lead . Bipolar limb leads are otherwise known as standard limb leads. Two limbs are connected to obtain these leads and both the electrodes are active recording electrodes, i.e. one electrode is positive and the other one is negative .
Standard limb leads are of three types: a. Limb lead I b. Limb lead II c. Limb lead III.
Lead I:- Lead I is obtained by connecting right arm and left arm. Right arm is connected to the negative terminal of the instrument and the left arm is connected to the positive terminal.
Lead II:- Lead II is obtained by connecting right arm and left leg. Right arm is connected to the negative terminal of the instrument and the left leg is connected to the positive terminal.
Lead III:- Lead III is obtained by connecting left arm and left leg. Left arm is connected to the negative terminal of the instrument and the left leg is connected to the positive terminal.