Which of the following statements is true regarding the positive electrodes of inferior leads?

Which of the following statements is true regarding the positive electrodes of inferior leads?

• A. They are positioned superiorly on the left arm
• B. They are positioned inferiorly on the left foot
• C. They are positioned laterally on the right foot
• D. They are positioned in the center of the chest

Answer: (B)

The correct statement highlights that the positive electrodes of the inferior leads are positioned inferiorly on the left foot. In an electrocardiogram (ECG), the inferior leads consist primarily of lead II, lead III, and aVF. For these leads, the positive electrodes are placed on the left leg (specifically the left foot), which allows them to capture electrical activity from the inferior aspect of the heart. This placement helps to effectively monitor the heart's activity from the lower regions, providing critical information regarding the heart's function.

Understanding this positioning is crucial because it reflects how each lead is designed to capture specific electrical signals based on their anatomical placement. For example, if one were to study leads I and aVL, you would find the positive electrode placed on the left arm, indicating that different leads have different focuses based on their assigned location. This variation in electrode placement and function is vital for accurate ECG interpretation, enabling healthcare professionals to assess heart conditions effectively.