T WAVE The T wave represents ventricular repolarization. The T wave is a nicely rounded wave that
follows the ST segment and in the normal heart, follows the direction of the main QRS deflection. The usual
T wave is never normally taller than half the height of the total QRS height. Terms used to describe abnormal
T waves would be: tall, flattened, pointed, pinched, notched, broad, inverted, deeply inverted, flat. It should
never be described as absent, elevated or depressed.
U WAVE The U wave is a medical curiosity. It is not clear what relationship it has with cardiac activity.
We do know that it becomes taller in hypokalemia and can flip in CAD. It usually follows the direction of the T
wave and is best seen in lead V3.
QT INTERVAL This interval is measured from the beginning of the QRS to the end of the T wave. At heart
rates of 65-90 the QT should not exceed half the R to R interval. This measurement is useful when dealing with calcium imbalance and TDP. How to Measure the QT and QTc.
TP SEGMENT This is the baseline between the T wave and the p wave. It is also known as the isoelectric
line. The baseline is drawn by using the terminal TP segment to terminal TP segment.
Point to and click on the J point