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Relationship between PCO2 and unfavorable outcome in infants with moderate-to-severe hypoxic ischemic encephalopathy
Abstract
Background Abnormal PCO2 is common in infants with hypoxic ischemic encephalopathy (HIE). The objective was to determine whether hypocapnia was independently associated with unfavorable outcome (death or severe neurodevelopmental disability at 18 mo) in infants with moderate-to-severe HIE.Methods This was a post hoc analysis of the CoolCap Study in which infants were randomized to head cooling or standard care. Blood gases were measured at prespecified times after randomization. PCO2 and follow-up data were available for 196 of 234 infants. Analyses were performed to investigate the relationship between hypocapnia in the first 72 h after randomization and unfavorable outcome.Results After adjusting for pH, amplitude-integrated electroencephalogram background and seizures, birth weight, Apgar score at 5 min, cooling status, and Sarnat stage, PCO2 was inversely associated with unfavorable outcome (P < 0.001). The probability of unfavorable outcome was 0.20 ± 0.1 (point estimate ± SE), 0.53 ± 0.23 and 0.89 ± 0.16 for a PCO2 of 40, 30, and 20 mm Hg respectively and was greater in infants with severe HIE than with moderate HIE.Conclusions Hypocapnia in infants with moderate-to-severe HIE was independently associated with unfavorable outcome. Future studies of controlled normocapnia will be important.
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Emerging evidence highlights that factors such as hypocapnia, hyperoxia, extreme fluctuations in blood pressure and glucose are associated with worse outcomes in neonates with HIE.
“Emerging evidence highlights that factors such as hypocapnia, hyperoxia, extreme fluctuations in blood pressure and glucose are associated with worse outcomes in this population (1, 4–8).”
From Lab values in neonates with hypoxic ischemic encephalopathy over time during and after therapeutic hypothermia (2026) · cites this paper as [4]
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Elias, M., Bliznyuk, N., Yasova Barbeau, D., Sukumar, S., Carlos Roig, J., Rajderkar, D., Sura, L., Wynn, J. L., & Weiss, M. D. (2026) · Frontiers in pediatrics · doi:10.3389/fped.2026.1743749
Metadata
- Authors
- ; on behalf of the CoolCap Study Group, Lingappan, K., Kaiser, J. R., Srinivasan, C., & Gunn, A. J.
- Affiliations
- Baylor College of Medicine (US)
- University of Auckland (NZ)
- Corresponding author
- Kaiser, Jeffrey R.
- Venue
- Pediatric Research
- Published
- 2016-04-06
- Volume
- 80
- Issue
- 2
- Pages
- 204-208
- ISSN
- 0031-3998 (ISSN-L)
- 1530-0447
- OpenAlex
- W2333542235
- Cited by
- 55
- References
- 25
- Citations by year
- 2026: 4 · 2025: 2 · 2024: 6 · 2023: 5 · 2022: 5 · 2021: 9 · 2020: 6 · 2019: 8 · 2018: 4 · 2017: 5 · 2016: 1
- FWCI
- 6.98
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Pediatric Research (publishedVersion)
- PubMed (publishedVersion)
- ResearchSpace (University of Auckland) (submittedVersion)
- Topics
- Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Neonatal and fetal brain pathology
- Health Sciences › Medicine › Critical Care and Intensive Care Medicine › Thermal Regulation in Medicine
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Neuroscience of respiration and sleep
- Keywords
- hypoxic-ischemic encephalopathy, hypocapnia, arterial PCO2, blood gases, neurodevelopmental outcomes, infant mortality, head cooling, neonatal hypoxia, Sarnat staging, normocapnia
- MeSH terms
- Apgar Score, Birth Weight, Blood Gas Analysis, Electroencephalography, Female, Humans, Hydrogen-Ion Concentration, Hypothermia, Induced, Infant, Newborn, Male, Oxygen Consumption, Probability, Prognosis, Seizures, Severity of Illness Index, Time Factors, Models, Statistical, Hypocapnia, Treatment Outcome, Hypoxia-Ischemia, Brain, Neurodevelopmental Disorders
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