The Electrophysiologic Characteristics in Patients with Only Ventricular-Pacing Inducible Slow–Fast Form Atrioventricular Nodal Reentrant Tachycardia |
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Authors: | Pi-Chang Lee Ching-Tai Tai Betau Hwang Ming-Hsiung Hsieh Chin-Feng Tsai Chern-En Chiang Wen-Chung Yu Hsuan-Ming Taso Kun-Tai Lee Yoga Yuniadi Wanwarang Wongchaoen Shih-Ann Chen |
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Institution: | (1) Departments of Pediatrics and Medicine, Taipei, Taiwan;(2) Taipei Veterans General Hospital and National Yang-Ming University, Taipei, Taiwan;(3) Division of Cardiology, Department of Medicine, Taipei Veterans General Hospital, Taiwan |
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Abstract: | Background: Atrioventricular nodal reentrant tachycardia (AVNRT) can be usually induced by atrial pacing or extrastimulation. However,
it is less commonly induced only by ventricular pacing or extrastimulation.
Objective: The purpose of this retrospective study was to investigate the electrophysiologic characteristics in patients with slow–fast
form AVNRT that could be induced only by ventricular pacing or extrastimulation.
Methods: The total population was 1497 patients associated with AVNRT. There were 1373 (91.7%) patients who had slow–fast form AVNRT
included in our study. Group 1 (n = 45) could be induced only by ventricular pacing or extrastimulation, and Group 2 (n = 1328) could be induced by only atrial stimulation or both atrial and ventricular stimulation. The electrophysiologic characteristics
of the group 1 and group 2 patients were compared.
Results: Group 1 patients had a significantly lower incidence of both antegrade and retrograde dual AV nodal pathways. The pacing
cycle length (CL) of the antegrade 1:1 fast pathway (FP) and antegrade ERP of the FP were both significantly shorter in Group
1 patients. Mean antegrade FRP of the fast and slow pathways were significantly shorter in Group 1 patients. The differences
of pacing CL of 1:1 antegrade conduction, antegrade ERP and FRP were much longer in Group 2 patients.
Conclusion: This study demonstrated the patients with slow–fast form AVNRT that could be induced only by ventricular stimulation had
a lower incidence of dual AV nodal pathways and the different electrophysiologic characteristics (shorter pacing CL of the
antegrade 1:1 FP, antegrade ERP of the FP and the differences of pacing CL of 1:1 antegrade conduction, antegrade ERP and
FRP) from the other patients. The specific electrophysiologic characteristics in such patients could be the reason that could
be induced only by ventricular stimulation. |
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Keywords: | electrophysiology radiofrequency catheter ablation atrioventricular nodal reentrant tachycardia ventricular stimulation |
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