Which of the following are the standard limb leads in a 12-lead EKG?

The standard limb leads in a 12-lead EKG are indeed Leads I, II, and III. These three leads are derived from the placement of electrodes on the limbs of the patient and are fundamental for obtaining a comprehensive view of the heart's electrical activity.

Lead I records the potential difference between the right arm and the left arm, providing insight into the heart's horizontal plane. Lead II, which measures the difference between the right arm and the left leg, gives a view that is particularly useful for detecting arrhythmias and assessing the heart's rhythm. Lead III, formed from the left arm and left leg, complements the information gathered by the first two leads and helps to provide an overall picture of the heart's electrical function.

These leads are vital as they are the foundation for understanding the various cardiac rhythms and conditions that can be identified on an EKG. The importance of standard limb leads cannot be overstated, as they collectively contribute to the first three projections in the standard 12-lead EKG, allowing clinicians to assess the heart's activity effectively.

In contrast, the other sets of leads mentioned do not correspond to the standard limb lead arrangement used in EKG monitoring. These incorrect options reflect different lead configurations that are not part of