Electroanatomically estimated length of slow pathway in atrioventricular nodal reentrant tachycardia

• DOI: 10.1007/s00380-013-0424-0
• Publication Date: 2013-10-12T01:44:37Z
• Authors: Tadanobu Irie; Yoshiaki Kaneko; Tadashi Nakajima; Masaki Ota; Takafumi Iijima; Mio Tamura; Takashi Iizuka; Shuntaro Tamura; Akihiro Saito; Masahiko Kurabayashi
• Keywords: Junctional rhythm; Atrioventricular node; Bundle of His; Electrophysiology study

The length of the slow pathway (SP-L) in atrioventricular (AV) nodal reentrant tachycardia (NRT) has never been measured clinically. We studied relationship among (a) SP-L, i.e., distance between most proximal His bundle (H) recording and posterior site radiofrequency (RF) delivery associated with a junctional rhythm, (b) Koch’s triangle (Koch-L), (c) conduction time over (SP-T), by AH interval during AVNRT at baseline, (d) H successful ablation (SucABL-L) 26 women 20 men (mean age 64.6 ± 11.6 years), using stepwise approach an electroanatomic mapping system (EAMS). SP-L (15.0 5.8 mm) was correlated Koch-L (18.6 5.6 mm; R 2 = 0.1665, P < 0.005), SP-T (415 100 ms; 0.3425, 0.036), SucABL-L (11.6 4.7 0.5243, 0.0001). located within 10 mm end SP 38 patients (82.6 %). EAMS-guided RF ablation, approach, revealed individual variations related to size AVNRT. Since also usually near SP, ablating anteriorly, away from end, is not prerequisite for success procedures.