What do U waves typically represent on an EKG?

U waves on an EKG typically represent post-repolarization waves. These waves occur after the T wave and are associated with the repolarization of the ventricles. They may indicate underlying electrolyte abnormalities, particularly when they are prominent. For example, U waves can often be seen in cases where there is hypokalemia (low potassium levels) or other electrolyte imbalances. Their appearance may serve as a critical diagnostic feature for clinicians, providing insights into the heart's electrical activity and the patient's overall electrolyte status.

Normal ventricular conduction relates primarily to the QRS complex and its duration, while atrial depolarization is represented by the P wave. In atrial fibrillation, the absence of distinct P waves is notable, and thus any mention of P waves in that context would not be applicable. Understanding the specific significance of U waves is important for interpreting EKGs effectively.