The 4th intercostal space on the right side is associated with which lead?

The 4th intercostal space on the right side is associated with which lead?

• A. Lead Chocolate
• B. Lead Snow
• C. Lead Grass
• D. Lead Smoke

Answer: (A)

The main idea is the standard placement of precordial (chest) leads. The right-side fourth intercostal space is where the V1 lead is placed, just to the right of the sternum. This position is chosen to monitor the initial electrical activity of the septum and right ventricle as the heart depolarizes. Among the options, the lead labeled Lead Chocolate corresponds to V1, so it’s the correct choice. The other names aren’t standard ECG lead placements, so they don’t match this location. For context, V2 is placed at the left side of the sternum in the same intercostal space, and V3–V6 extend laterally to capture activity from the remaining parts of the heart.

The main idea is the standard placement of precordial (chest) leads. The right-side fourth intercostal space is where the V1 lead is placed, just to the right of the sternum. This position is chosen to monitor the initial electrical activity of the septum and right ventricle as the heart depolarizes. Among the options, the lead labeled Lead Chocolate corresponds to V1, so it’s the correct choice. The other names aren’t standard ECG lead placements, so they don’t match this location. For context, V2 is placed at the left side of the sternum in the same intercostal space, and V3–V6 extend laterally to capture activity from the remaining parts of the heart.