Which leads are placed in the third column of the standard layout?

Which leads are placed in the third column of the standard layout?

• A. V1, V2, V3
• B. I, II, and III
• C. aVR, aVL, aVF
• D. V4, V5, V6

Answer: (A)

In the standard ECG layout used for practice, the chest (precordial) leads are grouped in a way that keeps adjacent anatomical positions together. The third column typically contains the early precordial leads, which are V1, V2, and V3. These leads sit closest to the sternum and form the left-to-right progression along the anterior chest, so they’re placed together in that column. The other chest leads, V4 through V6, usually appear in the other chest-related column, forming the separate group. So this layout places V1, V2, and V3 in the third column, which is why that set is the correct pick. The other options either refer to limb leads (I, II, III or aVR, aVL, aVF) or to the later chest leads (V4, V5, V6) that aren’t grouped in the third column.

In the standard ECG layout used for practice, the chest (precordial) leads are grouped in a way that keeps adjacent anatomical positions together. The third column typically contains the early precordial leads, which are V1, V2, and V3. These leads sit closest to the sternum and form the left-to-right progression along the anterior chest, so they’re placed together in that column. The other chest leads, V4 through V6, usually appear in the other chest-related column, forming the separate group.

So this layout places V1, V2, and V3 in the third column, which is why that set is the correct pick. The other options either refer to limb leads (I, II, III or aVR, aVL, aVF) or to the later chest leads (V4, V5, V6) that aren’t grouped in the third column.