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Published on: November 2, 2015
Intermittent hypoxia and long-term neurological outcome: How are they related?
1Dept. of Neonatology, Tuebingen University Hospital, Tuebingen, Germany.
Insights
Intermittent hypoxia (IH) is linked to impaired neurodevelopment in infants and children. Early detection and prevention of IH are crucial for better cognitive and language outcomes.
Area of Science:
- Neonatal research
- Pediatric neurology
- Sleep medicine
Background:
- Intermittent hypoxia (IH) is a condition characterized by repeated episodes of low oxygen saturation.
- Potential links between IH and neurodevelopmental impairments in infants and children are under investigation.
- Existing research highlights associations, particularly in preterm infants.
Purpose of the Study:
- To review existing data on the association between intermittent hypoxia and neurodevelopmental outcomes in infants and children.
- To emphasize the need for early detection and prevention of IH.
- To guide future research towards focusing on IH as a primary factor.
Main Methods:
- Secondary analysis of data from the Canadian Oxygen Trial involving extremely preterm infants.
- Review of studies examining apnea and bradycardia events in term and preterm infants.
- Examination of research on sleep-disordered breathing in older children.
- Inclusion of animal data investigating IH effects on the hippocampus.
Main Results:
- In extremely preterm infants, the highest exposure to IH (SpO2 <80% for ≥1 min) tripled the odds of cognitive or language impairment at 18 months corrected age.
- In older infants, 5+ events of prolonged apnea/bradycardia correlated with a 5-point decrease in the Bayley-II mental development index.
- Associations between sleep-disordered breathing and impaired cognition/academics in older children are inconsistent, with unclear mediation by IH or sleep deprivation.
- Animal studies suggest IH can induce apoptosis in the hippocampus.
Conclusions:
- While associations do not prove causation, current evidence strongly supports a link between intermittent hypoxia and impaired neurodevelopment.
- Early detection and prevention strategies for IH in vulnerable infants and children are warranted.
- Future research should prioritize investigating intermittent hypoxia directly, rather than solely focusing on apnea or bradycardia events.
Abstract:
This review looks at data on potential associations between intermittent hypoxia (IH) and impaired neurodevelopment in infants and children. In extremely preterm infants (<28 wk gestation), such an association has been established based on a secondary analysis of Canadian Oxygen Trial data. These showed, in 997 infants, that the odds of developing cognitive or language impairment at 18 months corrected age were 3 times higher in infants who were in the highest decile for %time spent with events where pulse oximeter saturation (SpO2) was <80% for ≥1 min during their first 10 postnatal weeks compared to those who had very few such events after birth. In older term and preterm infants, the occurrence of 5 or more events with prolonged apnea and bradycardia during home monitoring was associated with 5 points less on the mental development index of the Bayley-II scales. For older children, associations between sleep-disordered breathing and impaired cognition/academic achievements have also been established, but not consistently, and it remains unclear whether this association is primarily mediated via IH or via sleep deprivation. Animal data show that IH may cause apoptosis particularly in the hippocampus. Although we need to stress that associations cannot prove causality, current evidence provides support for IH to be detected and prevented early. Future studies should focus on IH rather than on apnea/bradycardia.
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