What Does the T Wave Represent on an ECG?

• The T wave in an electrocardiogram (ECG) corresponds to the repolarization of the ventricles.

• After ventricular depolarization (shown by the QRS complex), the ventricles undergo repolarization as they recover and prepare for the next contraction.

• Repolarization generates voltage changes that produce the T wave on the surface ECG.

Key Points About the T Wave

• The T wave is normally positive in most ECG leads due to the direction of repolarization currents relative to electrode placement.

• Ventricular repolarization is slower than depolarization, so the T wave is wider and of lower amplitude compared to the QRS complex.

• There is no distinct wave for atrial repolarization on ECG as it usually occurs during the QRS complex and is obscured.

Summary Table

Conclusion

The T wave of ECG indicates ventricular repolarization.

Thus, the correct answer is:

(3) Ventricular repolarization