Circulation Journal
Online ISSN : 1347-4820
Print ISSN : 1346-9843
ISSN-L : 1346-9843
Clinical Investigation
Electrophysiological Characteristics and Radiofrequency Ablation of Accessory Pathways With Slow Conductive Properties
Mamoru ManitaYoshiaki KanekoMasahiko KurabayashiSan-Jou YehMing-Shien WenChun-Chieh WangFun-Chung LinDelon Wu
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2004 Volume 68 Issue 12 Pages 1152-1159

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Abstract

Background Atrioventricular accessory pathways (AP) with unusually long ventriculo-atrial (VA) conduction times are present in a significant subset of patients with the Wolff-Parkinson-White (WPW) syndrome, not including patients with the permanent form of atrioventricular junctional reciprocating tachycardia. Methods and Results We compared the electrophysiological characteristics and outcomes after radiofrequency (RF) ablation in 34 patients with the WPW syndrome, a VA interval >80 ms, and paroxysmal tachycardia with an RP/PR ratio <1 (the slow group), vs 80 patients with WPW syndrome and a VA interval <80 ms (the fast group). AP were found in the posteroseptal region significantly more often in the slow than in the fast group. In addition, the decremental conductive properties of the AP were more common in the slow than in the fast group. Catheter ablation of AP was highly successful in both groups, although ablation required a greater number of RF applications and longer procedure times in the slow group, especially for AP with decremental conductive properties. Conclusions A posteroseptal AP location was more common in AP associated with long conduction times than in AP with typical conductive properties. Both types of AP were successfully ablated, although the slow group required longer procedures and more RF energy deliveries. (Circ J 2004; 68: 1152-1159)

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© 2004 THE JAPANESE CIRCULATION SOCIETY
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