In an ECG assessment, which part of the heart do leads 2 and leads 3 monitor?

Leads II and III on an electrocardiogram (ECG) are primarily used to monitor the inferior portion of the heart. These leads are positioned in such a way that they capture electrical activity from the lower regions of the heart, which are supplied by the right coronary artery in most individuals. By placing electrodes on the limbs, leads II and III provide a view of the heart's output from the inferior perspective, making them particularly useful for assessing conditions like inferior myocardial infarctions.

The inferior wall of the heart is crucial since it plays a significant role in pumping blood towards the lungs and body. Any changes or abnormalities detected in these leads may signify underlying issues with the coronary circulation in that region, thereby emphasizing their importance in the overall assessment of heart health and detecting potential life-threatening conditions.