What does the U Wave on an EKG represent?

The U wave on an EKG primarily represents repolarization of the Purkinje fibers. This wave appears after the T wave, which is associated with ventricular repolarization. The U wave is not as commonly observed as the other EKG components, and its significance can vary among individuals.

When examining the structure and function of the heart's conduction system, it is important to understand that the Purkinje fibers are specialized fibers that conduct nerve impulses to the heart muscle, allowing for efficient contraction and repolarization of the ventricles. The U wave may be more prominent in certain conditions, including electrolyte imbalances or metabolic disturbances, yet its presence alone is not indicative of any pathophysiological state.

In contrast, options referring to atrial depolarization, ventricular repolarization, and ventricular depolarization relate primarily to other components of the EKG. The P wave represents atrial depolarization, while the T wave represents ventricular repolarization. The QRS complex corresponds to ventricular depolarization. Understanding these distinctions is crucial for interpreting EKG readings accurately and recognizing the significance of each wave.