Electrophysiological Characteristics of Accessory Pathways with Prolonged Retrograde Conduction
Electrophysiological characteristics of an accessory pathway (AP) with a long ventriculoatrial (VA) interval (arbitrarily defined as ≥ 50 ms and absence of continuous electrical activity) and no retrograde decremental property are described in this study. Fifteen patients (group 1) were compared wit...
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Published in | Pacing and clinical electrophysiology Vol. 27; no. 9; pp. 1250 - 1256 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
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Blackwell Science Inc
01.09.2004
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Subjects | |
Online Access | Get full text |
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Summary: | Electrophysiological characteristics of an accessory pathway (AP) with a long ventriculoatrial (VA) interval (arbitrarily defined as ≥ 50 ms and absence of continuous electrical activity) and no retrograde decremental property are described in this study. Fifteen patients (group 1) were compared with 171 patients with normal VA conduction (group 2). Mean VA conduction time was 77 ± 24 versus 34 ± 12 ms in group 1 versus group 2, respectively. Group 1 patients were older (55 ± 14 vs 40 ± 14 years), the male to female ratio was higher (2.8 vs 1.6), and APs were more prevalent on the right (60%) but manifest APs were lower (20% vs 54%) compared to group 2 patients (P < 0.05 in all cases). QRS morphology during induced atrioventricular reciprocating tachycardia was identical in both groups but the tachycardia cycle length was longer in group 1 (373 ± 29 vs 344 ± 50 ms, P < 0.05). Retrograde AP block cycle length and effective refractory period were greater in group 1 (362 ± 59 vs 293 ± 57 ms; 330 ± 58 vs 273 ± 55 ms, both P <0.05). Adenosine (up to 18 mg) and verapamil (5–10 mg) failed to block the VA conduction via AP during ventricular pacing. In group 1 the number of radiofrequency lesions for a successful ablation were significantly less (3 ± 2 vs 6 ± 5, P < 0.05). In conclusion, APs with a long VA interval and no decremental retrograde conduction have electrophysiological characteristics that are different from those with a short VA interval. Role of aging deserves further exploration. |
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Bibliography: | ark:/67375/WNG-MTB94SCH-8 ArticleID:PACE616 istex:EAF650538F2D8EF387A6C93FF8E8D3880C6622DC Supported in part by grants 89‐2314‐B‐182A‐157, 90‐2314‐B‐182A‐041, and 92‐2314‐B‐182A‐189 from the National Science Council and grant CMRPG 32004 from Chang Gung Memorial Hospital, Taipei, Taiwan. ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0147-8389 1540-8159 |
DOI: | 10.1111/j.1540-8159.2004.00616.x |