Heart rate variability parameters in children with ventricular preexcitation

Area of Science:

• Cardiology
• Autonomic Nervous System Research
• Pediatric Electrophysiology

Background:

• The autonomic nervous system significantly influences cardiac electrophysiology and the development of arrhythmias.
• Understanding autonomic status in pediatric ventricular preexcitation is crucial for assessing arrhythmia risk.

Purpose of the Study:

• To evaluate cardiac autonomic status in children with ventricular preexcitation using heart rate variability (HRV) parameters.
• To correlate HRV parameters with accessory pathway conduction properties, tachycardia inducibility, and symptomology.

Main Methods:

• Retrospective analysis of electrocardiography, Holter monitoring, and electrophysiological study (TEEPS and EPS) data from ventricular preexcitation patients over 7 years.
• Classification of accessory pathway conduction as adverse or nonadverse based on TEEPS results.
• Comparison of HRV parameters (specifically LF/HF ratio) between patient groups (adverse vs. nonadverse conduction, inducible vs. non-inducible tachycardia, symptomatic vs. asymptomatic) and healthy controls.

Main Results:

• The LF/HF ratio, a measure of sympathovagal balance, was significantly higher in patients with adverse accessory pathway conduction compared to those with nonadverse conduction and controls.
• Ventricular preexcitation patients with inducible tachycardia (assessed by EPS) showed a higher LF/HF ratio than those without.
• Symptomatic ventricular preexcitation patients exhibited a higher LF/HF ratio compared to asymptomatic patients.
• No significant difference in HRV parameters was observed between preexcitation patients and healthy controls.

Conclusions:

• Autonomic tonus, reflected by the LF/HF ratio, appears to play a role in the electrophysiological properties of accessory pathways in ventricular preexcitation.
• Elevated sympathovagal imbalance (higher LF/HF ratio) is associated with increased risk of inducible tachycardia and symptomatic presentation in pediatric ventricular preexcitation.
• These findings highlight the potential of HRV analysis in assessing arrhythmia risk in children with ventricular preexcitation.