Noncontact Mapping-Guided Sinus Node Modification for Inappropriate Sinus Tachycardia
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概要
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Case 1, 46-year-old female suffered from palpitation and diagnosed as inappropriate sinus tachycardia (IST). Her total heart beats in Holter ECG revealed 12445 beats/day despite taking verapamil and metprolol. We performed EnSite multielectrode array-guided electrophysiological study and radiofrequency catheter ablation (RFCA). Baseline heart rate (HR) was 90 bpm. HR increased to 140 bpm and earliest activation site (EAS) shifted cranially about 25 mm by isoproterenol (ISO) infusion. RFCA to EAS was repeated until 15% decrease of HR was achieved from the baseline. At 3 months after RFCA, she spent comfortably and her HR was 70 bpm without any medication. Case 2, 55-year-old female with dyspnea and pretibial edema showed total heart beats of 145533 beats/day with taking verapamil and carvedilol. Her LVEF was 31% and plasma BNP level was 215 pg/ml. Baseline HR was 130 bpm and HR increased to 140 bpm by ISO infusion. EAS was at posterior side of mid-crista terminalis. After an RFCA at this site, EAS shifted cranially to RA-SVC border, and HR increased to 150 bpm. By repeated RFCA to EAS, 30% decrease of HR was achieved from the baseline, and EAS shifted caudally about 26 mm. At 6 months after RFCA, LVEF improved to 45% and plasma BNP level improved to 34 pg/ml. <B>Conclusions:</B> Though clinical manifestations and responses to ISO were variable, noncontact mapping-guided sinus modification may be an effective method to control IST.
著者
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Chikata Akio
Department Of Cardiology Fukuiken Saiseikai Hospital
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Kaneko Shuichi
Department Of Cancer Gene Regulation Kanazawa University
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Takamura Masayuki
Department Of Cardiology Graduate School Of Medical Science Kanazawa University
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Usui Soichiro
Department Of Disease Control And Homeostasis Graduate School Of Medical Science Kanazawa University
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Yamagishi Masakazu
Department of Advanced Electron Devices, The Institute of Scientific and Industrial Research (ISIR), Osaka University, Ibaraki, Osaka 567-0047, Japan
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Furusho Hiroshi
Department Cardiology, Kanazawa University Hospital
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Yaegashi Takanori
Department of Cardiology, National Hospital Organization, Kanazawa Medical Center, Japan
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Chikata Akio
Department Cardiology, Kanazawa University Hospital
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Yaegashi Takanori
Department Cardiology, Kanazawa University Hospital
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Takamura Masayuki
Department Cardiology, Kanazawa University Hospital
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Usui Soichiro
Department Cardiology, Kanazawa University Hospital
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