4 limb electrodes are used to view the frontal plane: RA, LA, LL, RL. These electrodes are used to produce the ___ ____ ___. I, II, III. All of these are bipolar leads.

4 limb electrodes are used to view the frontal plane: RA, LA, LL, RL. These electrodes are used to produce the ___ ____ ___. I, II, III. All of these are bipolar leads.

• A. Standard Limb Leads
• B. Precordial Leads
• C. Unipolar Leads
• D. Central Terminal Leads

Answer: (A)

The limb electrodes on the arms and leg form the standard limb leads that view the heart in the frontal plane, and these are bipolar. Each lead measures voltage between two limbs: one lead compares the right arm with the left arm, another compares the right arm with the left leg, and the third compares the left arm with the left leg. The fourth limb electrode is used as a ground reference (not part of the measurement for these three leads). This set is specifically known as the Standard Limb Leads. Precordial (chest) leads V1–V6 look at the heart in the horizontal plane and are unipolar representations using a common reference (Wilson’s central terminal). The augmented limb leads (aVR, aVL, aVF) are also unipolar, using that same reference. So the four limb electrodes that produce the frontal-plane bipolar measurements correspond to the Standard Limb Leads.

The limb electrodes on the arms and leg form the standard limb leads that view the heart in the frontal plane, and these are bipolar. Each lead measures voltage between two limbs: one lead compares the right arm with the left arm, another compares the right arm with the left leg, and the third compares the left arm with the left leg. The fourth limb electrode is used as a ground reference (not part of the measurement for these three leads). This set is specifically known as the Standard Limb Leads.

Precordial (chest) leads V1–V6 look at the heart in the horizontal plane and are unipolar representations using a common reference (Wilson’s central terminal). The augmented limb leads (aVR, aVL, aVF) are also unipolar, using that same reference. So the four limb electrodes that produce the frontal-plane bipolar measurements correspond to the Standard Limb Leads.