ECG In electrocardiography, the<unk>  connects the QRS complex and the T wave and has a duration of 0.005 to 0.150 sec (5 to 150 ms). It<unk> arts at the J point (junction between the QRS complex and<unk>  and ends at the beginning of the T wave. However, since it is usually difficult to determine exactly where the<unk>  ends and the T wave begins, the relationship between the<unk>  and T wave should be examined together. The typical<unk>  duration is usually around 0.08 sec (80 ms). It should be essentially level with the PR and TP<unk> s. The<unk>  represents the isoelectric period when the ventricles are in between depolarization and repolarization.
ST segment
T wave
QRS complex
P wave 
J wave
PR interval
U wave
QT interval