Which wave on an EKG indicates the end of ventricular depolarization?

The QRS complex on an EKG represents the depolarization of the ventricles, which is a crucial phase in the cardiac cycle as it initiates ventricular contraction. The end of the ventricular depolarization is signified by the completion of the QRS complex. This complex consists of the Q wave, R wave, and S wave, each corresponding to different sequential electrical activities that occur in the ventricles.

To further clarify the other parts of the EKG: the P-wave represents atrial depolarization, indicating the electrical activation of the atria before they contract. The T-wave follows the QRS complex and signifies ventricular repolarization, which is the process of the ventricles recovering electrical balance after contraction. The U-wave, which is less commonly seen, is not typically associated with the main events of ventricular depolarization or repolarization and may represent other electrophysiological processes.

Thus, identifying the QRS complex as marking the end of ventricular depolarization is critical for interpreting cardiac electrical activity and understanding the overall heart rhythm.