Autonomic cardiovascular control in children with obstructive sleep apnea

Area of Science:

• Cardiorespiratory control
• Autonomic nervous system (ANS) function
• Pediatric sleep medicine

Background:

• Autonomic cardiorespiratory control varies with sleep-wake states.
• Sleep-related breathing disorders significantly influence autonomic function.
• Power spectrum (PS) analysis of heart rate (HR) fluctuations assesses autonomic nervous system (ANS) roles.

Purpose of the Study:

• To investigate autonomic cardiorespiratory control in children diagnosed with obstructive sleep apnea (OSA) syndrome.
• To compare ANS function between children with OSA and healthy controls during various sleep-wake states.

Main Methods:

• Studied 10 children with OSA and 10 healthy controls.
• Utilized whole-night polysomnography for data acquisition.
• Performed spectral analysis on heart rate (HR) and breathing signals during artifact-free epochs.

Main Results:

• The low-frequency (LF) power component was elevated in the OSA group across all states, indicating increased sympathetic activity.
• Sympathetic predominance was observed during REM sleep in all subjects.
• Parasympathetic predominance occurred during slow-wave sleep exclusively in controls.
• The autonomic balance (LF/HF ratio) was significantly higher in OSA patients compared to controls throughout the night and before sleep onset.

Conclusions:

• Children with OSA exhibit enhanced sympathetic activity and a heightened autonomic balance (LF/HF ratio) compared to healthy children.
• The computed autonomic balance index (ABI) demonstrated a strong correlation with the respiratory disturbance index (RDI).
• Findings suggest a significant disruption of autonomic cardiorespiratory control in pediatric OSA.