In general, this term is used to describe a narrow complex tachycardia not including atrial fibrillation or atrial flutter. The term SVT frequently refers to AVNRT, however technically it means ...

Atrial flutter and fibrillation ... Periods of paroxysmal rapid heart action, having a sudden onset and offset, are designated as paroxysmal supraventricular tachycardia, and are most frequently ...