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The biphasic ventilatory response to hypoxia in preterm infants is not due to a decrease in metabolism

V Rehan1, A Z Haider, R E Alvaro

  • 1Department of Pediatrics, University of Manitoba, Winnipeg, Canada.

Pediatric Pulmonology
|November 1, 1996
PubMed
Summary

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Neonatal ventilatory response to hypoxia is biphasic. Increasing alveolar PCO2 did not abolish the late decrease in ventilation, suggesting a central origin rather than metabolic changes.

Area of Science:

  • Neonatal physiology
  • Respiratory control
  • Hypoxia research

Background:

  • The biphasic ventilatory response to hypoxia in neonates remains poorly understood.
  • A decrease in metabolism, indicated by reduced CO2 production, has been proposed as a cause for the late decline in ventilation during hypoxia.

Purpose of the Study:

  • To investigate the role of CO2 production in the biphasic ventilatory response to hypoxia in preterm infants.
  • To determine if increasing alveolar PCO2 can abolish the late decrease in ventilation during hypoxic conditions.

Main Methods:

  • Studied 27 preterm infants using a flow-through system to measure ventilation and alveolar gases.
  • Measured oxygen consumption to assess metabolic rate.
  • Infants were exposed to hypoxia alone or hypoxia with varying concentrations of CO2 (0.5% and 2%).

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Main Results:

  • A biphasic ventilatory response to hypoxia was observed, characterized by initial hyperventilation followed by hypoventilation.
  • The late decrease in ventilation persisted even when alveolar PCO2 was maintained by CO2 supplementation.
  • Oxygen consumption decreased similarly across all hypoxic conditions, indicating no significant metabolic adaptation to abolish the ventilatory decline.

Conclusions:

  • The late decrease in ventilation during hypoxia in neonates is unlikely to be solely due to a decrease in metabolism.
  • The findings suggest a central mechanism, possibly involving inhibitory neurotransmitters, underlies the late hypoventilation during hypoxia.