Atrioventricular nodal reentrant tachycardia.

Atrioventricular nodal reentrant tachycardia represents the most frequent, regular tachyarrhythmia in humans, but its exact circuit has so far remained elusive. This review presents new evidence that allows the proposal of a model for the arrhythmia circuit as well as a reclassification of the types of atrioventricular nodal reentrant tachycardia and discusses the implications for effective and safe catheter ablation of the arrhythmia.