On an EKG, which wave represents ventricular repolarization?

The T wave on an EKG represents ventricular repolarization. During this phase, the heart's ventricles, which have just contracted to pump blood out to the body and lungs, are returning to their resting state. This process involves the movement of ions across the ventricular muscle cell membranes, specifically the outflow of potassium ions, leading to the restoration of the associated electrical potential.

The T wave comes after the QRS complex, which represents ventricular depolarization and the contraction of the ventricles. Understanding the sequence of these waves is crucial for interpreting cardiac rhythms and diagnosing potential heart issues. The presence and shape of the T wave can also provide insights into the heart's health, as abnormalities in this wave can indicate conditions such as ischemia or electrolyte imbalances.