1
The portion of the ECG when no electrical activity is detected
2
A rate over 100 beats per minute.
3
A rate less than 60 beats per minute.
4
A rhythm when the R-R intervals are not consistent
5
An early complex occurring before the next expected beat
6
May be indicated by depressed ST segment
7
A beat firing outside the SA node even though the SA node is working
8
A back-up pacemaker beat
9
Represents depolarization of the ventricles
