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Cardioventilatory coupling in preterm and term infants: effect of position and sleep state

Dawn E Elder1, Peter D Larsen, Duncan C Galletly

  • 1Department of Paediatrics, University of Otago Wellington, Wellington, New Zealand. dawn.elder@otago.ac.nz

Respiratory Physiology & Neurobiology
|May 19, 2010
PubMed

Insights

Cardioventilatory coupling (CVC), the link between heartbeats and breathing, is more common in infants during quiet sleep. This finding suggests cardiac activity influences infant breathing, potentially aiding oxygenation in preterm infants.

Area of Science:

  • Neonatal physiology
  • Respiratory control
  • Cardiorespiratory interactions

Background:

  • Cardioventilatory coupling (CVC) describes the synchronization between cardiac and respiratory rhythms.
  • Understanding CVC in infants is crucial for assessing cardiorespiratory control.
  • Sleep state and infant maturity may influence CVC.

Purpose of the Study:

  • To investigate the effect of sleep state (Quiet Sleep vs. Active Sleep) and infant position (prone vs. supine) on CVC.
  • To quantify CVC using Shannon Entropy of the R-I interval.
  • To explore the relationship between CVC and oxygen saturation (SpO2) in preterm and term infants.

Main Methods:

  • Collected cardiorespiratory signals and SpO2 from preterm and term infants during Quiet Sleep and Active Sleep.
  • Calculated R-R and R-I intervals to assess timing between heartbeats and inspiratory onsets.
  • Quantified CVC using proportional Shannon Entropy (SH(α)) of the RI(-1) interval.

Main Results:

  • CVC was significantly more prevalent in Quiet Sleep for both preterm and term infants.
  • Infant position did not significantly influence CVC in either sleep state.
  • CVC showed a significant negative correlation with SpO2 in preterm infants, but not in term infants.

Conclusions:

  • Infant sleep state, particularly Quiet Sleep, augments cardiac influence on ventilatory rhythm.
  • Position does not appear to be a major factor in CVC.
  • In preterm infants, CVC may play a role in maintaining adequate oxygenation.

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