However, if “variable conduction” of the atrial flutter waves to the ventricles is present, the QRS complexes can be irregularly irregular. Also, multifocal atrial tachycardia, or MAT ...

though atrial flutter with variable conduction of the P waves can also occur. In this situation, there may be three P waves to one QRS complex, then a quick change to two P waves to one QRS ...

A wide-complex reentrant tachycardia occurs with conduction down the ... supraventricular tachycardias are atrial fibrillation, atrial flutter with variable atrioventricular block, and multifocal ...

or atrial flutter or tachycardia with variable conduction through the AV node. A narrow-complex tachycardia with a regular rhythm is likely to be sinus tachycardia, AVRT, AVNRT, atrial flutter or ...