What does ventricular repolarization correspond to on an ECG?

Ventricular repolarization corresponds to the T wave on an ECG. During the cardiac cycle, after the ventricles have depolarized and contracted (which is reflected in the QRS complex), they return to their resting state through the process of repolarization. This repolarization is represented by the T wave on the ECG.

The T wave thus reflects the electrical changes that occur as the ventricles prepare for the next cycle of contraction. Understanding this aspect of the ECG is key for interpreting various heart rhythms and conditions, as abnormalities in the T wave can indicate issues like ischemia or electrolyte imbalances.

In contrast, the other options represent different phases of the cardiac electrical cycle. The P wave corresponds to atrial depolarization, the QRS complex represents ventricular depolarization, and the U wave is often associated with repolarization of the Purkinje fibers but is not a standard part of the ventricular repolarization phase.