Which of the following leads provides less information compared to others?

The reason why aVR provides less information compared to the other leads is due to its positioning and the nature of its electrical viewing direction. aVR stands for augmented voltage right and primarily measures electrical activity from the heart directed towards the right arm. This perspective is often less helpful for diagnosing cardiac conditions because it captures electrical activity that is not as representative of the heart's overall functioning as other leads do.

In contrast, other leads such as Lead I, Lead II, and Lead III have orientations that allow them to provide a more comprehensive view of the heart's electrical activity. For example, Lead II views from the right arm to the left leg, highlighting the main electrical conduction pathway of the heart and is particularly useful for monitoring the heart's rhythm and rate. Similarly, Lead I and Lead III also capture the heart's electrical activity from different angles in the frontal plane, providing critical information for evaluating various conditions.

Overall, aVR has a narrower focus that does not effectively capture the complete picture of the heart's electrical activity, making it less informative in comparison to the other leads. This is why it is recognized as providing less diagnostic value in a standard ECG assessment.