Heart rate variability in children with obstructive sleep apnea

Area of Science:

• Pediatric Cardiology
• Sleep Medicine
• Autonomic Nervous System Function

Background:

• Obstructive sleep apnea syndrome (OSAS) is associated with significant heart rate changes in adults.
• Emerging evidence suggests similar heart rate alterations in children with OSAS.
• These cardiac changes may offer a non-invasive method for OSAS screening in pediatric populations.

Purpose of the Study:

• To investigate beat-to-beat cardiac variability in children diagnosed with OSAS.
• To determine if heart rate variability patterns differ between children with OSAS and healthy controls.
• To assess the potential of heart rate variability for screening pediatric OSAS.

Main Methods:

• Six-hour polysomnographic recordings were analyzed in seven children with OSAS and seven age-matched controls.
• Poincaré plots were utilized to evaluate beat-to-beat cardiac variability across different heart rate ranges.
• Statistical comparisons were made between the OSAS group and the control group.

Main Results:

• Children with OSAS exhibited significantly increased beat-to-beat variation at slow heart rates compared to controls.
• Conversely, beat-to-beat variation at fast and intermediate heart rates was significantly reduced in children with OSAS.
• These alterations in cardiac variability were observed across all heart rates but were most pronounced at slower rates.

Conclusions:

• Pediatric OSAS demonstrably alters beat-to-beat cardiac variability in a distinct manner.
• The observed heart rate variability patterns, especially at slow rates, show promise for assisting in the screening of suspected pediatric OSAS cases.
• Heart rate variability analysis presents a potential tool for early identification of OSAS in children.