When does the U wave typically appear?

The U wave typically appears after the T wave in an EKG. It is a small, positive deflection that may be seen following the T wave and is thought to represent the repolarization of the Purkinje fibers in the heart. While not always present in every EKG, when it does appear, it follows the T wave, indicating that it is part of the normal cardiac electrical cycle.

Recognizing the timing of the U wave is important in EKG interpretation, as its presence and morphology can provide clinical insights into various cardiac conditions. The timing of the U wave reinforces the concept that the cardiac cycle is complex and involves multiple phases of depolarization and repolarization.

In a complete understanding of the EKG, distinguishing when waves occur helps in diagnosing and assessing cardiac rhythm and function.