Where does the U-wave appear on an EKG?

The U-wave appears after the T wave on an EKG. This feature is considered a normal variant and is thought to represent the repolarization of the papillary muscles or the Purkinje fibers in the heart. Typically, the T wave corresponds to the repolarization of the ventricles, and the U wave follows it, indicating a continuation of the repolarization process.

In clinical practice, the presence, morphology, and size of the U wave can provide additional diagnostic information, especially in conditions such as hypokalemia or certain cardiac diseases. Recognizing and locating the U wave in relation to the T wave is important for interpreting EKGs accurately.