An unusual long RP tachycardia: What is the mechanism?

The article presents a case study of a 77-year-old woman with palpitations. An electrocardiogram during the tachycardia showed a narrow complex tachycardia with a long RP supraventricular tachycardia which was diagnosed as atypical atrioventricular nodal reentrant tachycardia (AVNRT) with a concealed nodofascicular (NF) or nodoventricular (NV) bypass tract. Also noted is the condition's termination by a ventricular premature depolarization (VPD).