Which lead is often referred to as the "anterior lead"?

The term "anterior lead" in the context of an ECG refers to the leads that primarily monitor the anterior wall of the heart, which is generally supplied by the left anterior descending artery. Lead V2 is positioned on the precordial plane, specifically over the left sternal border at the fourth intercostal space, and it captures electrical activity from the anterior area of the left ventricle.

Lead V3, while also considered a part of the anterior leads, is situated close to the center of the chest and monitors more central aspects of the heart. It works alongside other leads to provide a complete view of the anterior wall but is not designated specifically as the main anterior lead.

Leads V1 and V5 are positioned respectively at the right side of the sternum and on the left side of the chest further away from the center. Lead V1 is more focused on the right ventricle and the septum, while Lead V5 captures the lateral region of the heart, highlighting activities in the left ventricle's lateral wall.

Thus, Lead V2 is considered the anterior lead due to its strategic position that provides clear readings from the anterior heart wall area. It plays a critical role in assessing conditions like anterior myocardial infarctions