Which describes the placement of V4 in a 12-Lead ECG?

The placement of V4 in a 12-lead electrocardiogram (ECG) is specifically located in the fifth intercostal space at the midclavicular line on the left side of the chest. This positioning allows for optimal monitoring of the heart's electrical activity from the anterior viewpoint and is crucial for detecting abnormalities such as ischemia or infarction in the inferior wall of the heart.

Positioning V4 accurately is essential for reliable results, and it typically follows the placement of V2, which is positioned on the left sternal border. V4 serves as one of the limb leads that contribute to the comprehensive overview provided by a 12-lead ECG, particularly for identifying conditions affecting the coronary arteries. This is why the choice that describes moving from V2 to the fifth intercostal space at the midclavicular line correctly explains the placement of V4.