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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
PubMed

Insights

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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