V1 placement is described as which location?

• A. 4th ICS Right of sternum
• B. 4th ICS Left of sternum
• C. 3rd ICS Right of sternum
• D. 5th ICS Right of sternum

Answer: (A)

V1 is placed at the right side of the sternum in the fourth intercostal space. This position gives an anterior view of the heart, especially the right ventricle and the interventricular septum, and it provides a standardized starting point for comparing ECGs. If V1 were placed to the left of the sternum or at a different intercostal space, the electrical signal captured would reflect a different part of the heart and could distort interpretation. The other precordial placements are fixed to other nearby landmarks (for example, V2 is at the left of the sternum in the same space; V4 is at the left midclavicular line in the fifth intercostal space), so the fourth intercostal space, right of the sternum, is the correct location.