Why are limb leads referred to as bipolar leads?

Why are limb leads referred to as bipolar leads?

• A. Both electrodes are placed on the same limb
• B. One electrode is negative and one is positive
• C. They measure electrical activity in the heart
• D. They are only used for measurement of chest leads

Answer: (B)

Limb leads are referred to as bipolar leads because they involve two electrodes of opposite polarity: one electrode serves as the positive pole and the other as the negative pole. This configuration allows for the measurement of electrical potential differences generated by the heart's activity as seen from two points (or electrodes) in the body.

The concept of bipolar leads is fundamental to EKG interpretation, as it reflects the heart's electrical activity in a way that highlights variations in voltage between the two electrodes, enabling clinicians to determine the heart's rhythm, axis, and other important characteristics. This setup is crucial for capturing the heart's overall electrical behavior from various angles, providing a comprehensive view of cardiac function.

Understanding the bipolar nature of these leads is essential when interpreting EKGs, as it affects the readings and the understanding of the heart’s positions in different anatomical planes.