Which of the following leads are included in the A leads of the ECG?

The correct answer includes aVR, aVL, and aVF, which are known as the augmented leads in the electrocardiogram (ECG) system. These leads are derived from the limb leads and are part of the standard 12-lead ECG.

Each of the augmented leads is developed by enhancing the electrical signals detected from specific limb electrodes. For instance, aVR measures the potential from the right arm and provides information about the heart's electrical activity from a different angle. Similarly, aVL uses the left arm perspective, and aVF reflects signals from the feet, which offers insights into the heart's activity in the frontal plane.

This triangular arrangement enhances the ability to detect abnormalities by improving the sensitivity of the readings in these specific areas. Understanding the function of augmented leads is crucial for accurate ECG interpretation, as they help provide a comprehensive view of the heart's electrical activity.

Other choices contain leads that either do not represent the augmented configuration or mix different types of leads, such as precordial leads (V leads) or standard limb leads, which do not fall under the definition of augmented leads.