What does a T wave represent in an EKG?

The T wave on an electrocardiogram (EKG or ECG) represents ventricular repolarization, which is a crucial phase in the cardiac cycle. After the ventricles have contracted and pumped blood out to the lungs and body during the QRS complex (which signifies ventricular depolarization), the T wave reflects the subsequent recovery phase where the ventricles reset electrically in preparation for the next heartbeat. This repolarization is essential for restoring the electrical state of the cardiac muscle cells, ensuring that they are ready to respond again with a strong contraction.

In the context of heart function, understanding the timing and nature of these electrical events is vital for monitoring cardiac health, diagnosing arrhythmias, and providing appropriate medical interventions when necessary. The T wave’s characteristics can also give insight into potential issues such as electrolyte imbalances or ischemia, further underlining its importance in clinical practice.