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Introduction: The decremental properties of the nodoventricular pathway (NVP) are uncertain. Methods and Results: During short RP supraventricular tachycardia, a His‐refractory premature ventricular contraction (PVC) consistently terminated the tachycardia without atrial capture immediately after the PVC. Whereas a slightly earlier PVC failed to reset the subsequent His but terminated the tachycardia without atrial capture one cycle later. Conclusion: These observations are diagnostic of slow‐fast atrioventricular nodal reentrant tachycardia (AVNRT) with a bystander concealed‐NVP and can be explained by decremental properties in the NVP itself; greater prematurity of the PVC resulted in more decremental conduction over the NVP, causing the AVNRT termination one cycle later. [ABSTRACT FROM AUTHOR]

We report a case of a 44‐year‐old male who underwent an electrophysiological study for symptomatic supraventricular tachycardia (SVT) with wide QRS complex. The SVT was diagnosed as an antidromic atrioventricular reentrant tachycardia (AVRT) via antegrade conduction of left‐sided accessory pathway (AP). However, the QRS morphology changed during the SVT, and then the SVT was terminated spontaneously. The mapping of AP was performed during sinus rhythm, and the radiofrequency application successfully eliminated the AP, which rendered tachycardias non‐inducible. This was a rare case of antidromic AVRT during which the QRS morphology changed. [ABSTRACT FROM AUTHOR]

The article presents a case study of a 48-year-old man with a dual atrioventricular nodal physiology that has a narrow QRS tachycardia. Scanning and stimulation showed double ventricular response and a stim-H2 interval with a diagnosis of SVT-2 as a junctional tachycardia (JT). Additional radio frequency (RF) was not applied and the patient has been free from any tachycardia for 32 months.

The article presents a case of a 72-year-old female who was presented for radiofrequency ablation of narrow QRS tachycardia with ventriculoatrial block (VAB) to discuss the mechanism of VAB in tachychardia. Also cited are the use of atrial extra-stimulation to monitor her dual atrioventricular nodal physiology and VAB during atrioventricular nodal reentrant tachycardia (AVNRT).

The article describes a case of a male patient who was hospitalized due to symptomatic palpitations. Topics mentioned include the mechanism of a narrow QRS tachycardia with different atrial sequence during ventricular pacing, the atrial activation sequences of ventriculoatrial conduction, and the rare existence of atrioventricular nodal reentrant tachycardia with retrograde activation.

A 35-year-old woman was referred for treatment of a supraventricular tachycardia. The tachycardia was diagnosed as a slow-fast form of atrioventricular nodal reentrant tachycardia. Radiofrequency ablation targeting the antegrade slow pathway was performed at the posterior septum of the right atrium. After the radiofrequency ablation, ventricular extrastimulus pacing was performed to assess the retrograde slow pathway, which was suggested before the ablation. The prolongation of the VA interval with a 10 ms decrease in the S2 pacing interval was 60 ms and retrograde dual pathways were suspected. However, the HA interval did not change and a prolongation of the VA interval was caused by the prolongation of the VH interval and no additional ablation was required. [ABSTRACT FROM AUTHOR]

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).

Supplemental Digital Content is available in the text. [ABSTRACT FROM AUTHOR]