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Cardioventilatory coupling and inter-breath variability in children referred for polysomnography
D E Elder1, P D Larsen, A J Campbell
1Department of Paediatrics, University of Otago, Wellington, P.O. Box 7434, Wellington, New Zealand. dawn.elder@otago.ac.nz
Respiratory Physiology & Neurobiology
|January 31, 2012
Summary
Respiratory variability and cardioventilatory coupling (CVC) differ in children with Prader Willi syndrome (PWS). CVC may offer a physiological advantage for children with PWS during sleep.
Area of Science:
- Pediatric Sleep Medicine
- Respiratory Physiology
- Neurodevelopmental Disorders
Background:
- Respiratory variability is crucial for maintaining homeostasis during sleep.
- Cardioventilatory coupling (CVC) quantifies the interaction between respiratory and cardiac rhythms.
- Understanding respiratory patterns in genetic syndromes is vital for clinical management.
Purpose of the Study:
- To investigate respiratory variability and CVC in children with Down syndrome (DS) and Prader Willi syndrome (PWS) compared to non-syndromic children.
- To determine the influence of sleep state, age, and obesity on respiratory variability.
- To explore the potential physiological role of CVC in PWS.
Main Methods:
- Polysomnography was used to record respiratory and cardiac signals in 8 DS, 4 PWS, and 42 non-syndromic children.
- Respiratory variability measures (e.g., SDf, CVf) and CVC (using Shannon Entropy of RI interval, SHα) were calculated.
- Statistical analyses examined associations with age, oxygen saturation, obesity, and sleep state (REM vs. Stage 4).
Main Results:
- Cardioventilatory coupling (SHα) varied with age, oxygen saturation, and PWS diagnosis in Stage 4 sleep.
- Respiratory variability measures (SDf, CVf, kurtosis, skewness) were significantly influenced by sleep state.
- Ventilatory frequency decreased with age in REM sleep and increased with obesity in REM and Stage 4 sleep.
Conclusions:
- Sleep state significantly impacts respiratory variability in children.
- Cardioventilatory coupling may provide a physiological advantage in children with Prader Willi syndrome.
- These findings highlight distinct respiratory control mechanisms in syndromic populations.
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