What does the T-wave represent in an electrocardiogram (ECG)?

The T-wave in an electrocardiogram (ECG) represents ventricular repolarization. During the cardiac cycle, after the ventricles contract and depolarize, they must return to their resting state, which is reflected by the T-wave. This repolarization is crucial because it allows the heart muscle to reset and prepares for the next heartbeat. The T-wave follows the QRS complex, which indicates ventricular depolarization, highlighting the sequence in which the electrical activity and resultant heart muscle contractions occur. Understanding the T-wave's role in the cardiac cycle helps clinicians assess cardiac function and health.