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Updated: Jun 5, 2025
Early Pathological and Magnetic Resonance Detection of Cerebral Injury Using a Rat Model of Neonatal Hypoxic Ischemic Encephalopathy
Published on: October 28, 2022
Temporal dynamics of neonatal hypoxic-ischemic encephalopathy injuries on magnetic resonance imaging
Holly Flyger1, Samantha J Holdsworth1,2,3, Alistair J Gunn3
1Mātai Medical Research Institute, Tairāwhiti Gisborne, New Zealand.
Insights
Magnetic resonance imaging (MRI) in the first week after birth offers strong prognostic accuracy for infants with perinatal hypoxic-ischemic encephalopathy (HIE). Further research is needed to determine optimal MRI timing for predicting long-term outcomes.
Area of Science:
- Neonatal neurology
- Neuroimaging
- Perinatal medicine
Background:
- Perinatal hypoxic-ischemic encephalopathy (HIE) affects 1-3/1000 live births in high-income countries, risking death or disability.
- Accurate assessment is crucial for identifying high-risk infants and guiding interventions.
- Various monitoring tools exist, but magnetic resonance imaging (MRI) uniquely visualizes brain anatomy for prognostic insight.
Purpose of the Study:
- To investigate the temporal dynamics of neonatal HIE injuries.
- To correlate prognostic implications of early-life MRI scans with long-term outcome prediction, especially in infants receiving therapeutic hypothermia.
Main Methods:
- Comprehensive literature search from 2016-2024.
- Identification and review of 20 pertinent articles on HIE, MRI timing, and outcomes.
- Analysis of studies focusing on MRI's prognostic value within the first week of life.
Main Results:
- MRI within the first week of life demonstrates strong prognostic accuracy for HIE outcomes.
- Optimal MRI timing remains unclear due to challenges like intensive care needs and monitoring.
- Some evidence suggests brain injury can evolve for weeks, indicating potential for later imaging to be informative.
Conclusions:
- Early MRI (within the first week) is a valuable tool for predicting long-term outcomes in HIE.
- Challenges in timing consistency exist, necessitating careful clinical consideration.
- Future research should explore a broader range of post-HIE imaging times to optimize prognostic accuracy.
Abstract:
Moderate to severe perinatal hypoxic-ischemic encephalopathy occurs in ~ 1 to 3/1000 live births in high-income countries and is associated with a significant risk of death or neurodevelopmental disability. Detailed assessment is important to help identify high-risk infants, to help families, and to support appropriate interventions. A wide range of monitoring tools is available to assess changes over time, including urine and blood biomarkers, neurological examination, and electroencephalography. At present, magnetic resonance imaging is unique as although it is expensive and not suited to monitoring the early evolution of hypoxic-ischemic encephalopathy by a week of life it can provide direct insight into the anatomical changes in the brain after hypoxic-ischemic encephalopathy and so offers strong prognostic information on the long-term outcome after hypoxic-ischemic encephalopathy. This review investigated the temporal dynamics of neonatal hypoxic-ischemic encephalopathy injuries, with a particular emphasis on exploring the correlation between the prognostic implications of magnetic resonance imaging scans in the first week of life and their relationship to long-term outcome prediction, particularly for infants treated with therapeutic hypothermia. A comprehensive literature search, from 2016 to 2024, identified 20 pertinent articles. This review highlights that while the optimal timing of magnetic resonance imaging scans is not clear, overall, it suggests that magnetic resonance imaging within the first week of life provides strong prognostic accuracy. Many challenges limit the timing consistency, particularly the need for intensive care and clinical monitoring. Conversely, although most reports examined the prognostic value of scans taken between 4 and 10 days after birth, there is evidence from small numbers of cases that, at times, brain injury may continue to evolve for weeks after birth. This suggests that in the future it will be important to explore a wider range of times after hypoxic-ischemic encephalopathy to fully understand the optimal timing for predicting long-term outcomes.
