JCK-AP session 1 (II-JCKAP1)
Arrhythmia

[II-JCKAP1-4] Characteristics of Age-dependent Atrioventricular Accessory Pathways in Patients with Atrioventricular Reentrant Tachycardia

^○Taisuke Nabeshima¹, Hitoshi Mori², Ritsushi Kato², Koichi Toda¹, Takuro Kojima¹, Toshiki Kobayashi¹, Naokata Sumitomo¹ (1.The department of Pediatric Cardiology, International Medical Center, Saitama Medical University, Saitama, 2.The department of Cardiology, International Medical Center, Saitama Medical University, Saitama)

Keywords:accessory pathways, WPW syndrome, natural history

[Background] The differences and characteristics of atrioventricular accessory pathways (APs) between children and elderly people have not been fully investigated.[Method] From 2019/1 to 2023/5, 131 consecutive patients with atrioventricular reentrant tachycardia who underwent a 1st catheter ablation using 3D mapping in our institute were enrolled in this study, and divided into 77 cases under 16-years-old (pediatric group), and 54 cases under 80-years-old (adult group). The APs' location and electrophysiological characteristics were investigated.[Resul For the age at the time of ablation, the 12-14 age group was dominant (31%) in the pediatric group, but almost the same for each age group in the adult group. Regarding the AP locations, types A, B, C were 50%, 38%, and 4% respectively in the pediatric group and 80%, 9%, and 9% in the adult group. The incidence of multiple APs was higher in the pediatric group (13%) than adult group (1%). The retrograde AP effective refractory period did not significantly different among the groups.[Conclusio Left-sided APs became more dominant and the incidence of multiple APs much lower in the adult group. The retrograde APs' effective refractory period did not different among the age groups.