Final answer:
The lead placed to the left of the sternum at the fourth intercostal space is referred to as V4, which is crucial for monitoring the mid-lateral wall of the left ventricle in ECG procedures.
Step-by-step explanation:
The lead to the left of the sternum at the fourth intercostal space is V4.
The sternum, which is the elongated bony structure in the thoracic cage, includes the manubrium, body, and xiphoid process.
Understanding the anatomy of the sternum and the correct placement of electrocardiogram (ECG) leads is crucial when monitoring cardiac function.
The heartbeat originating from different chambers of the heart can be assessed by placing leads at various intercostal spaces adjacent to the sternum.
V4 typically provides a view of the mid-lateral wall of the left ventricle, which is helpful in diagnosing certain cardiac conditions.