What does the T wave of an ECG represent?

The T wave of an ECG represents ventricular repolarization. This phase is crucial because it indicates the recovery of the ventricles after they have contracted and pumped blood out of the heart. During the T wave, the myocardial cells in the ventricles reset their electrical state, allowing them to prepare for the next heartbeat. This repolarization is essential for maintaining the heart's efficient rhythm and function.

Understanding this process is fundamental in interpreting an ECG, as it plays a critical role in identifying any abnormalities in heart function. For instance, a flattened or inverted T wave can indicate underlying cardiac issues, such as ischemia or electrolyte imbalances.