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Related Experiment Video

Updated: Jun 15, 2026

Continuous Telemetric In Utero Tracheal Pressure Measurements in Fetal Lambs
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Continuous Telemetric In Utero Tracheal Pressure Measurements in Fetal Lambs

Published on: December 22, 2023

Postnatal autonomic activity in the preterm lamb.

Hugues Patural1, Marie St-Hilaire, Vincent Pichot

  • 1Neonatal Respiratory Research Unit, Department of Pediatrics, Université de Sherbrooke, QC, Canada. hugues.patural@chu-st-etienne.fr

Research in Veterinary Science
|March 6, 2010
PubMed
Summary

Autonomic nervous system (ANS) activity in preterm lambs showed initial overactivity at postnatal day 7, which normalized by day 14. This suggests ANS maturation in premature newborns may follow a distinct pattern, potentially impacting cardiac control.

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Area of Science:

  • Neonatal physiology
  • Autonomic nervous system development
  • Cardiorespiratory control

Background:

  • Abnormal autonomic nervous system (ANS) activity in early infancy is linked to apneas, apparent life-threatening events, and sudden infant death syndrome.
  • Premature birth may disrupt the normal maturation of baseline ANS activity.

Purpose of the Study:

  • To assess autonomic nervous system (ANS) maturation in preterm lambs.
  • To evaluate ANS response to laryngeal chemoreflexes (LCR) at baseline and after stimulation.

Main Methods:

  • Polysomnography was used to record heart rate variability (HRV) and baroreflex sensitivity (BRs) in five preterm lambs.
  • Laryngeal chemoreflexes were induced using water or acid during sleep and wakefulness on postnatal days 7 and 14.

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Main Results:

  • Life-threatening cardiorespiratory events from LCR at day 7 resolved by day 14.
  • Baseline and post-LCR HRV and BRs were significantly lower at day 14 compared to day 7.
  • Findings suggest an initial autonomic overactivity at day 7 that normalized by day 14.

Conclusions:

  • Autonomic cardiac and baroreflex control in preterm lambs exhibits a unique developmental trajectory compared to full-term lambs.
  • An initial phase of autonomic stress observed in preterm lambs normalizes by full-term equivalence.
  • Further research is needed to understand the implications for neonatal cardiac control anomalies.