| Project/Area Number |
05670705
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Pediatrics
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| Research Institution | Nihon University |
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Principal Investigator |
SUMITOMO Naokata NIHON UNIVERSITY,DEPARTMENT OF PEDIATRICS, 医学部, 助手 (50231379)
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| Co-Investigator(Kenkyū-buntansha) |
HARADA Kensuke NIHON UNIVERSITY DEPARTMENT OF PEDIATRICS,PROFESSOR, 医学部, 教授 (40208674)
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| Project Period (FY) |
1993 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1995: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1994: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1993: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | SUPRAVENTRICULAR TACHYCARDIA / CATHETER ABLATION / ACCESSORY PATHWAY |
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| Research Abstract |
Fourteen cases of supraventricular tachycardia with manifest or concealed Wolff-Parkinson-White syndrome in children were performed radiofrequency catheter ablation. The optimal size of catheter was 7 French in patients over 10 years old, and 6 French in patients less than 10 years old. Accessory pathway potential were recorded in 5 of 6 cases. The position of accessory pathway potential and earliest atrial activation site were not always same. Radiofrequency accessory pathway ablation were succeeded in all cases who were recorded accessory pathway potential. Total energy for ablation was 20 to 40 Watt sec. All cases succeeded ablation in a few seconds. Ablation were succeeded in 2 of 4 right pathways and 6 of 10 left pathways. Ablation were succeeded in 4 of 9 (44%) manifest pathways and 4 of 5 (80%) concealed pathways. However it was unsuccessful in septal and multiple pathway. Success rate was 8 of 14 cases (57%) , 8 of 15 pathways (53%). The successful ablation site was 1) Kent potential documentation, 2) A wave amplitude equal and over 0.4 mV,3) A/V ratio equal and over 0.2,4) shortest VA or QA interval measured from peak V wave to peak A wave during tachycardia or ventricular pacing. However there were no absolute optimal site if we use these indexes. Moderate aortic regurgitation was detected in one case after ablation. This complication was not due to ablation method but due to inflexibility of catheter. Catheter ablation was useful therapy for supraventricular tachycardia in children.
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