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Can analysis of heart rate variability predict arrhythmia in children with Fontan circulation?

A Rydberg1, M Karlsson, R Hörnsten

  • 1Department of Clinical Sciences, Unit of Pediatrics, University Hospital of Umeå, S-901 85, Umeå, Sweden. Annika.Rydberg@vll.se

Pediatric Cardiology
|September 25, 2007
PubMed

Insights

Changes in heart rate variability (HRV) may predict arrhythmias in children post-Fontan procedure. Poincaré plots show distinct patterns in patients who develop arrhythmias, aiding early detection.

Area of Science:

  • Pediatric Cardiology
  • Cardiac Electrophysiology
  • Congenital Heart Disease

Background:

  • The Fontan procedure is a palliative surgery for complex congenital heart defects.
  • Arrhythmias are a significant complication following the Fontan procedure.
  • Early detection of arrhythmias is crucial for patient management.

Purpose of the Study:

  • To investigate if heart rate variability (HRV) can predict arrhythmias in children after the Fontan procedure.
  • To analyze differences in HRV parameters, specifically Poincaré plots, between children with and without arrhythmias.

Main Methods:

  • Study included 15 children who underwent the Fontan procedure.
  • Utilized 24-h ambulatory electrocardiogram with power spectral analysis of HRV.
  • Employed Poincaré plots to analyze R-R interval variability.

Main Results:

  • Patients who developed supraventricular tachycardia (n=6) showed different Poincaré plot patterns compared to those without arrhythmias (n=8).
  • A significant difference was observed in the standard deviation of beat-to-beat R-R interval variability (p=0.02) between groups.
  • Poincaré plots exhibited a 'torpedo- or comet-shaped' pattern in the non-arrhythmia group versus a more complex pattern in the arrhythmia group.

Conclusions:

  • Poincaré plot analysis may identify pre-clinical arrhythmias in Fontan patients.
  • This method could offer earlier detection of arrhythmias than conventional Holter monitoring.
  • Routine follow-up with Holter and Poincaré plot analysis is recommended for early arrhythmia detection.

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