ABNORMAL SIGNAL AVERAGED ECG AFTER SURGICAL REPAIR OF TETRALOGY OF FALLOT : A Combined Analysis in the Time and Frequency Domain

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概要

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• Purpose: The clinical significance of abnormal signal averaged ECG (SA-ECG) determined by time and frequency domain analyses was assessed in tetralogy of Fallot patients after surgical repair, and the methods of analysis were compared. Materials and methods: SA-ECG was performed in 42 patients (mean age, 9.4 years) after radical surgical repair of tetralogy of Fallot, and in 11 preoperative patients (mean age, 2.6 years). Abnormal SA-ECGs Were defined by time domain analysis (vector magnitude method) and frequency domain analysis (fast Fourier transformation). Results: Abnormal SA-ECGs Were recognized in 10 postoperative, patients (3 by time domain and 9 by frequency domain, analysis), but in none of the pre-operative patients. Three patients with abnormal SA-ECGs had nonsustained ventricular tachycardia, 5 others had premature ventricular contractions, and the remaining 2 had no ventricular tachyarrhythmias documented by 24 h Holter monitoring. Patients with abnormal SA-ECGs more commonly had ST-T segment depression on standard ECG during exercise (8/10 versus 8/32, p<0.001), a history of resection of a hypertrophic septoparietal muscle band (8/10 versus 2132, p<0.001) and histologically documented myocardial fibrosis at radical surgical repair (9/10 versus 5/19, p<0.002). Conclusion: A Combination of time and frequency domain analyses was necessary to detect abnormal SA-ECGs in postoperative patients because of ventricular conduction disturbance. This technique might increase our ability to identify patients at risk of ventricular tachyarrhythmia, or those with underlying myocardial abnormalities.

• 社団法人日本循環器学会の論文
• 1993-08-20

著者

• HAYABUCHI Yasunobu

  Department of Pediatrics, School of Medicine, University of Tokushima

• Hayabuchi Yasunobu

  Department Of Pediatrics

• Kitagawa Tetsuya

  Department of Cardiovascular Surgery, IHBS, the University of Tokushima Graduate School

• MATSUOKA SUGURU

  Department of Pediatrics

• AKITA HIROSHI

  Department of Pediatrics

• TAGUCHI YOSHIYUKI

  Department of Pediatrics

• KUBO MASAHIRO

  Department of Pediatrics

• KATOH ITSUO

  Department of Cardiovascular Surgery

• II KUNIO

  First Department of Pathology Tokushima University Hospital

• Matsuo Suguru

  Department Of Pediatrics

• Ii Kunio

  First Department Of Pathology School Of Medicine The University Of Tokushima

• Akita Hiroshi

  徳島大学医学部

• Matsuoka Suguru

  徳島大学医学部

• Kitagawa Tetsuya

  Department Of Cardiovascular Surgery

• Kubo Masahiro

  Department Of Orthopaedic Surgery Fukuoka University School Of Medicine

• Akita Hiroshi

  Department Of Civil Engineeringr Tohoku Institute Of Technology

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