Clinical Report: Assessment of Initial Arterial Blood Gas Metrics in Neonates

Overview

This study evaluates the relationship between early arterial blood gas metrics, clinical characteristics, and neuroimaging results in neonates treated with therapeutic hypothermia for suspected hypoxic-ischemic encephalopathy (HIE). It finds that lower bicarbonate levels are associated with any-stage HIE and that seizures correlate with lower gestational age and more negative base excess values.

Background

Hypoxic-ischemic encephalopathy (HIE) is a significant cause of neonatal mortality and long-term neurodevelopmental impairment. Therapeutic hypothermia is the standard treatment for affected neonates, yet the interplay between early blood gas parameters and clinical outcomes remains inadequately understood.

Data Highlights

Key Findings

• Lower bicarbonate levels were associated with the presence of any-stage HIE compared to no final evidence of HIE.
• Neonates with seizures had a significantly lower gestational age.
• Base excess values were more negative in neonates experiencing seizures.
• Concordance between cranial ultrasonography and MRI was low.
• Blood gas pH and 5 min Apgar scores tended to be lower in the HIE group, although not statistically significant.

Clinical Implications

The findings suggest that early blood gas parameters, particularly bicarbonate levels, may serve as important indicators of HIE severity. Clinicians should consider these metrics in conjunction with clinical and imaging findings for better prognostic assessments.

Conclusion

This study evaluates early arterial blood gas metrics in understanding HIE in neonates treated with therapeutic hypothermia.

Related Resources & Content

1. Frontiers in Pediatrics, 2026 -- Association of the neonatal sequential organ failure assessment score with neurological outcomes in infants diagnosed with hypoxic-ischemic encephalopathy
2. Frontiers in Pediatrics, 2026 -- Cumulative secondary systemic metabolic cerebral insults are associated with disease severity and mortality in neonatal hypoxic–ischaemic encephalopathy: a retrospective study
3. BMJ Paediatrics Open, 2023 -- Early postnatal hypothermia in critically transported newborns at a Chinese tertiary care neonatal centre: a retrospective study
4. Therapeutic Hypothermia for Neonatal Hypoxic-Ischemic Encephalopathy: Clinical Report | Pediatrics | American Academy of Pediatrics
5. European Radiology — Impact of Cerebellar Hemorrhage in Extremely Preterm Infants: Correlation of Dentate Nucleus Involvement and Cerebellar Hypoplasia with Negative Cognitive Outcomes
6. Whole-body hypothermia for neonates with hypoxic-ischemic encephalopathy - PubMed
7. Consensus Approach for Standardization of the Timing of Brain Magnetic Resonance Imaging and Classification of Brain Injury in Neonates With Neonatal Encephalopathy/Hypoxic-Ischemic Encephalopathy: A Canadian Perspective
8. Therapeutic Hypothermia for Neonatal Hypoxic-Ischemic Encephalopathy: Clinical Report | Pediatrics | American Academy of Pediatrics