Where is the V1 ECG lead placement located?

Where is the V1 ECG lead placement located?

• A. 4th intercostal space to the right of the sternum
• B. 5th intercostal space to the left of the sternum
• C. 3rd intercostal space to the right of the sternum
• D. 4th intercostal space to the left of the sternum

Answer: (A)

V1 is a chest (precordial) ECG lead placed in the 4th intercostal space just to the right of the sternum. This location positions the electrode over the right ventricle and the septal area, giving a view of the heart’s electrical activity from that side. Placing it elsewhere would change the view the lead provides—for example, moving to the left of the sternum at the same level corresponds to a different lead position (V2), and other options aren’t standard V1 sites. So the correct placement is the 4th intercostal space to the right of the sternum.

V1 is a chest (precordial) ECG lead placed in the 4th intercostal space just to the right of the sternum. This location positions the electrode over the right ventricle and the septal area, giving a view of the heart’s electrical activity from that side. Placing it elsewhere would change the view the lead provides—for example, moving to the left of the sternum at the same level corresponds to a different lead position (V2), and other options aren’t standard V1 sites. So the correct placement is the 4th intercostal space to the right of the sternum.