What is the significance of the T wave in an EKG?

The T wave is a critical component of the electrocardiogram (EKG or ECG) that represents ventricular repolarization. This process occurs after the ventricles have contracted and pumped blood out of the heart. As the heart muscle cells return to their resting state, electrical activity that reflects this change is recorded as the T wave.

Ventricular repolarization is essential for the heart's electrical cycle, ensuring that the heart is ready for the next contraction. The T wave typically follows the QRS complex, which indicates ventricular depolarization (contraction). Analyzing the T wave can provide significant insights into the heart's electrical health and can reveal issues such as electrolyte imbalances or the presence of heart disease.