Cardiac Vascular Nursing Certification Practice Exam 2025 - Free Cardiac Vascular Nursing Practice Questions and Study Guide

The leads that specifically represent the left anterior descending (LAD) artery are V3 and V4. This is due to their anatomical positioning on the ECG and their relationship to the heart's electrical activity.

In a 12-lead ECG, leads V3 and V4 are positioned over the anterior wall of the left ventricle, which is predominantly supplied by the LAD artery. When there is a blockage or ischemia in the LAD artery, changes in these leads, such as ST-segment elevation or depression, are often observed. This helps in diagnosing conditions like anterior myocardial infarction.

The other leads mentioned in the options, such as I, aVL, V1, V2, and leads II, III, aVF, correspond to different parts of the heart or vascular supply. For instance, I and aVL primarily monitor the lateral wall, while V1 and V2 are more oriented towards the septal area. Similarly, leads II, III, and aVF focus on the inferior aspect of the heart, associated mainly with the right coronary artery. Thus, understanding the specific regions represented by each lead is crucial for accurate interpretation of ECG findings in context with cardiac arterial supply.