During the t wave of the electrocardiogram, the ventricles are electrically repolarizing and functionally relaxing.
The T Wave shows ventricular repolarization when the ventricles relax after contracting and depolarizing. The ST segment shows the period between ventricular depolarization and repolarization, which is the space (a flat or slightly upcurved line) between the S wave and the T wave.
Although absent or downward sloping ST segments may suggest myocardial ischemia, a raised ST segment is the typical sign of myocardial infarctions. The U wave, which denotes the repolarization of the Purkinje fibres, comes after the T wave.
Because it is a relatively little wave in relation to the others, it does not usually appear on an ECG.
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