Electrocardiographic RR and QT Interval Variability in Patients with Atrial Septal Defect and Healthy Children

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Atrial septal defect is a common congenital heart disease. In patients with atrial septal defect, left-to-right shunting increases the right atrial and right ventricular preload. This pathological change affects sinus node automaticity and myocardial depolarization and repolarization, and has the potential to evoke arrhythmogenic substrates. We examined the effect of atrial septal defect on sinus node automaticity and myocardial repolarization by investigating the variability in the repolarization interval, namely the QT variability index (QTVI) and variability ratio (VR). This retrospective study included 38 patients (mean age, 2.2 ± 1.9 years; mean left-to-right shunt ratio, 2.1 ± 0.70) and 40 age-matched healthy control subjects evaluated from 2008 to 2015. QTVI was calculated using the ratio of the repolarization parameter variance to heart rate variance, and VR was calculated as the ratio of the standard deviation (SD) of QT intervals to the SD of RR intervals on electrocardiography. There was a significant difference in the SD of all normal RR intervals, heart rate variance, VR, and QTVI of control subjects or patients with low shunt ratio compared with patients with high shunt ratio (all P < 0.05). Linear regression analysis revealed strong positive correlations between the left-to-right shunt ratio and VR (r = 0.662, P < 0.0001) or QTVI (r = 0.808, P < 0.0001). These repolarization indices provide information on alteration of sinus node autonomic control and the pathophysiology of myocardial repolarization, and could be used as a noninvasive indicator of the shunt ratio in children with atrial septal defect.

Original languageEnglish
Pages (from-to)582-587
Number of pages6
JournalPediatric Cardiology
Issue number3
Publication statusPublished - 01-03-2017

All Science Journal Classification (ASJC) codes

  • Pediatrics, Perinatology, and Child Health
  • Cardiology and Cardiovascular Medicine


Dive into the research topics of 'Electrocardiographic RR and QT Interval Variability in Patients with Atrial Septal Defect and Healthy Children'. Together they form a unique fingerprint.

Cite this