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Published on: November 20, 2015
Early blood gas abnormalities and the preterm brain
Alan Leviton1, Elizabeth Allred, Karl C K Kuban
1Neuroepidemiology Unit, Neurology Department, Children’s Hospital Boston, and Harvard Medical School, Boston, Massachusetts 02215-5724, USA. alan.leviton@childrens.harvard.edu
American Journal of Epidemiology
|September 3, 2010
Summary
Extreme blood gas values in preterm infants are linked to neonatal brain damage indicators. However, multiple abnormal blood gas levels, not single instances, may signal increased risk due to immaturity and illness severity.
Area of Science:
- Neonatalogy
- Pediatric Neurology
- Critical Care Medicine
Background:
- Preterm infants (<28 weeks gestation) are vulnerable to brain injury.
- Blood gas homeostasis is critical for neonatal brain development.
- Understanding associations between blood gas derangements and brain damage is crucial for early intervention.
Purpose of the Study:
- To investigate the relationship between blood gas abnormalities in the early postnatal period and indicators of neonatal brain damage in preterm infants.
- To determine if the duration or type of blood gas derangement influences the risk of brain injury.
Main Methods:
- Prospective study of over 1,000 preterm infants (<28 weeks gestation) across 14 US institutions (2002-2004).
- Comparison of infants with extreme blood gas values (highest/lowest quintile) on postnatal days 1-3 versus others.
- Analysis of various blood gas derangements (hypoxemia, hyperoxemia, hypocapnia, hypercapnia, acidosis) and their association with brain injury indicators.
Main Results:
- All analyzed blood gas derangements showed associations with multiple indicators of neonatal brain damage.
- Some associations were linked to single-day exposure, while others required two or more days of abnormal blood gas values.
- Specific findings included ventriculomegaly, echolucent lesions, cerebral palsy, microcephaly, and low Bayley Scale scores.
Conclusions:
- Individual blood gas derangements alone may not significantly increase the risk of neonatal brain damage.
- The presence of multiple blood gas derangements, rather than isolated abnormalities, might serve as indicators of preterm infant immaturity, vulnerability, and overall illness severity, correlating with brain damage indicators.
