Ventricular Inhomogeneity and Beat-to-beat QT Interval Variability after Surgical Repair of Tetralogy of Fallot
Journal of the Korean Pediatric Society
; : 418-425, 2001.
Artigo
em Coreano
| WPRIM (Pacífico Ocidental)
| ID: wpr-97753
Biblioteca responsável:
WPRO
ABSTRACT
PURPOSE:
The object of this study is to determine whether QT interval variability in patients with postoperative tetralogy of Fallot increases.METHODS:
We enrolled 41 patients who had total correction of tetralogy of Fallot, and 31 healthy controls. They were 6-12 years old. Patients were divided into 2 groups arrhythmia-positive patients(n=10) who had ventricular premature contractions more than 30/hour or who had couplets, and arrhythmia-negative patients(n=31). We selected the 10-minute arrhythmia-free portion of 24-hour ambulatory ECG recorded during sleep(1-3AM). We selected the 2nd beat of recordings for a template, then found the QT interval for each beat. The method was that T-wave shape best matches template T-wave under the time-stretch model. The mean heart rate and variance and mean QT interval and variance were computed and then a QT variability index(QTVI)-which represents the log ratio between QT interval variability and heart rate variability-was derived.RESULTS:
Postoperative tetralogy of Fallot patients with/without ventricular arrhythmia showed significantly increased QTVI compared with the control(-0.481+/-0.310/-0.661+/-0.376 vs -1.200+/-0.380, P<0.0001). There was a trend that QTVI in patients with ventricular arrhythmia increased more than in patients without ventricular arrhythmia, but there were no statistical significances.CONCLUSION:
QT interval variability increased in repaired tetralogy of Fallot patients with/without ventricular arrhythmia compared with the control. And this finding indicates that inhomogeneity of temporal ventricular repolarization exists in repaired tetralogy of Fallot patients.
Texto completo:
Disponível
Base de dados:
WPRIM (Pacífico Ocidental)
Assunto principal:
Arritmias Cardíacas
/
Tetralogia de Fallot
/
Eletrocardiografia
/
Frequência Cardíaca
Limite:
Humanos
Idioma:
Coreano
Revista:
Journal of the Korean Pediatric Society
Ano de publicação:
2001
Tipo de documento:
Artigo