Where is the V1 positive electrode for the chest or precordial lead located?

The V1 positive electrode for a chest or precordial lead is accurately positioned in the 4th intercostal space, adjacent to the right sternal border. This placement is essential for obtaining reliable readings regarding the electrical activity of the heart, particularly in the right ventricle and the interventricular septum.

Positioning the V1 lead in this specific location allows for an optimal view of the heart’s electrical activity as it reflects the anterior and septal walls. The proximity to the sternum helps in detecting abnormal electrical conduction that might not be visible from other lead placements. Understanding these anatomical landmarks is crucial for effective cardiac monitoring and interpretation of electrocardiogram (ECG) results.

The other choices do not accurately reflect the established guidelines for lead placement, as V1 is specifically designated for the 4th intercostal space at the right sternal border, making B the only correct answer.