TP Segment

The TP segment is the portion of the ECG from the end of the T wave to the beginning of the P wave. This segment should always be at baseline and is used as a reference to determine whether the ST segment is elevated or depressed, as there are no specific disease conditions that elevate or depress the TP segment.

During states of tachycardia, the TP segment is shortened and may be difficult to visualize altogether. It is good to examine the TP segment closely for the presence of U waves or atrial activity that could indicate pathology.