Leads V3 and V4 on an ECG look primarily at which part of the heart?

Leads V3 and V4 on an ECG primarily monitor the anterior wall of the heart. This region is associated with the blood supply from the left anterior descending (LAD) artery, which is crucial for myocardial perfusion. The anterior wall includes areas of the left ventricle that are directly viewed by these leads, allowing for the detection of ischemic changes or infarctions within that region.

When interpreting an ECG, it's essential to understand that certain leads correspond to specific areas of the heart based on their anatomical positioning. V3 and V4 are located in the chest area over the left side, and their placement enables them to capture electrical activity primarily from the anterior surface of the heart. Recognizing this relationship aids in diagnosing conditions such as anterior wall myocardial infarctions, where changes in these leads can provide critical information about the patient's cardiac status.