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Hypoxic ischaemic encephalopathy: early magnetic resonance imaging findings and their evolution
M A Rutherford1, J M Pennock, J E Schwieso
1Department of Paediatrics and Neonatal Medicine, Hammersmith Hospital, Royal Postgraduate Medical School, London, UK.
Insights
Serial brain MRI in term infants with hypoxic-ischaemic encephalopathy (HIE) revealed key early signs like brain swelling and loss of signal in the posterior limb of the internal capsule (PLIC). These MRI findings help predict long-term structural brain changes.
Area of Science:
- Neonatal neurology
- Pediatric neuroimaging
- Clinical neurology
Background:
- Hypoxic-ischaemic encephalopathy (HIE) is a major cause of neonatal brain injury.
- Early detection and characterization of HIE brain injury are crucial for prognosis.
- Magnetic resonance imaging (MRI) is a key tool for evaluating neonatal brain development and injury.
Purpose of the Study:
- To investigate the utility of serial brain MRI in term infants with HIE.
- To identify early MRI findings indicative of HIE brain injury.
- To correlate early MRI findings with subsequent structural brain changes.
Main Methods:
- Serial brain MRI was performed on 18 term infants diagnosed with HIE.
- Imaging included T1-weighted spin echo, inversion recovery, and T2-weighted spin echo sequences.
- MRI scans were conducted for up to two months post-birth.
Main Results:
- Early MRI findings included brain swelling, cortical highlighting, diffuse loss of grey/white matter differentiation, and posterior limb of the internal capsule (PLIC) signal loss.
- Brain swelling was transient, observed only within the first week of life across all HIE grades.
- Cortical highlighting, grey/white matter differentiation loss, and PLIC signal loss persisted and correlated with later structural brain abnormalities.
- T1-weighted and inversion recovery sequences were more sensitive than T2-weighted sequences for detecting these early signs.
Conclusions:
- Serial MRI in HIE infants reveals characteristic early signs of brain injury.
- Specific MRI findings, particularly after the initial swelling subsides, are valuable for predicting long-term structural brain damage.
- MRI, especially T1-weighted imaging, aids in the early assessment and management of HIE.
Abstract:
Eighteen term infants with hypoxic ischaemic encephalopathy (HIE) were studied with serial magnetic resonance imaging of the brain for up to two months following birth. Important early findings included brain swelling, cortical highlighting, diffuse loss of grey/white differentiation and loss of signal in the posterior limb of the internal capsule (PLIC). These signs were easier to identify on T1-weighted spin echo or inversion recovery sequences than on T2-weighted spin echo sequences. Brain swelling was only seen in the first seven days and was present in all grades of HIE. All other signs persisted and were associated with the subsequent development of major structural changes in the brain. The exact pattern of injury was best identified after the first week of life once the signs of brain swelling had cleared.