Effects of Perinatal Hyperoxia on Breathing

Area of Science:

• Physiology
• Neuroscience
• Developmental Biology

Background:

• Air-breathing animals do not naturally encounter hyperoxia (inspired O2 > 21%).
• Preterm and full-term infants frequently experience hyperoxia/hyperoxemia in clinical settings.
• The effects of perinatal hyperoxia on respiratory control are not fully understood.

Purpose of the Study:

• To investigate the effects of normobaric hyperoxia during the perinatal period on breathing in humans and other mammals.
• To examine the neural control of breathing during and after hyperoxic exposure.
• To assess responses to subsequent hypoxic and hypercapnic challenges.

Main Methods:

• Review of existing literature on hyperoxia and respiratory control.
• Analysis of studies focusing on perinatal hyperoxia in human and nonhuman mammals.
• Investigation of both peripheral and central nervous system mechanisms.

Main Results:

• Acute hyperoxia typically causes immediate ventilatory depression, sometimes followed by hyperpnea.
• Chronic perinatal hyperoxia can lead to hypoventilation and attenuated hypoxic ventilatory response (HVR) in nonhuman animals.
• Perinatal hyperoxia impacts carotid body development, potentially causing transient or permanent changes.

Conclusions:

• Perinatal hyperoxia induces developmental plasticity in respiratory control, including hypoventilation and altered HVR.
• Carotid body development is significantly affected by perinatal hyperoxia, with implications for O2 sensitivity and neuronal integrity.
• Further research is needed to determine if clinical hyperoxic exposures in human infants alter respiratory control development.