Which of the following describes the placement for Lead III?

Lead III is an electrocardiogram (ECG or EKG) lead that reflects the electrical activity of the heart between two specific points on the body. The correct placement for Lead III is from the right arm to the left leg. This configuration measures the potential difference in electrical activity between these two points, capturing information primarily from the inferior wall of the heart.

In a standard ECG setup, the limb leads are defined as follows:

• Lead I measures the voltage difference between the left arm and right arm,
• Lead II measures between the right arm and left leg, and
• Lead III measures between the left arm and left leg.

Lead III provides crucial information about the heart's activity and is particularly useful for assessing certain cardiac conditions. This placement ensures that the electrical signals generated by the heart are accurately recorded, allowing for proper diagnosis and management of cardiac issues.