If there is sinus rhythm, and the heart rate is greater than 100 bpm, then sinus tachycardia is present. The links below take you to examples of each of these. If there are no P waves present ...

This ECG displays an accelerated idioventricular rhythm. This has a left bundle branch block pattern and is a good example of the AV dissociation that occurs. Now, look at the rhythm strip at the ...

These can also take over the heart rhythm if they beat faster than the sinus node's rate. Idioventricular rhythm and accelerated idioventricular rhythm are examples of this—the rhythm originates ...