What does the T wave in an ECG indicate?

The T wave in an electrocardiogram (ECG) represents ventricular repolarization. This is the process where the ventricles, after contracting to pump blood, reset their electrical state in preparation for the next heartbeat. The T wave follows the QRS complex, which indicates the depolarization of the ventricles (when they contract). During repolarization, the ventricular muscle cells recover their resting electric state, a critical phase for the proper function of the heart, as it sets the stage for the next contraction.

Understanding the role of the T wave is essential for analyzing cardiac rhythms and diagnosing potential heart conditions, as abnormalities in the T wave can suggest issues with the heart’s electrical system or muscle health. This aspect makes it a significant component of the ECG that healthcare professionals monitor for indications of various cardiac conditions.