Patient Care Technician (PCT) AAH Practice Exam

Where is V1 placed during a 12-lead ECG?

1. Fifth intercostal space, right of the sternum

2. Fifth intercostal space left of the sternum

3. Fourth intercostal space, right of the sternum

4. Fourth intercostal space left of the sternum

The correct answer is: Fourth intercostal space, right of the sternum

The correct placement for V1 on a 12-lead ECG is in the fourth intercostal space, just to the right of the sternum. This position is crucial as it allows for accurate measurement of the electrical impulses originating from the heart's right side, specifically the right ventricle and the interventricular septum, which is essential for diagnosing various cardiac conditions. Proper placement of V1 contributes significantly to the overall quality and interpretability of the ECG, as it helps to provide a clear view of the heart's activity in that region. The other options do not provide the correct anatomical landmarks for V1 placement. For instance, placing V1 in the fifth intercostal space, whether right or left of the sternum, would be too low on the chest and would not adequately capture the electrical signals from the heart's upper regions. Placing it in the fourth intercostal space on the left side would also misrepresent the intended area of observation for the right-sided heart structures. Therefore, the specified location in the fourth intercostal space, right of the sternum, is fundamental for accurate heart monitoring and diagnosis.