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Proton spectroscopy and diffusion imaging on the first day of life after perinatal asphyxia: preliminary report
A J Barkovich1, K D Westmark, H S Bedi
1Department of Neuroradiology, University of California, San Francisco 94143, USA.
Insights
Early MRI in newborns with suspected brain injury shows MR spectroscopy is sensitive to hypoxic-ischemic damage. Diffusion imaging may underestimate the extent of injury in the first 24 hours after birth.
Area of Science:
- Neonatal neurology
- Neuroimaging
- Perinatal medicine
Background:
- Magnetic Resonance (MR) techniques are valuable for subacute/chronic brain injury assessment.
- Advances in understanding brain injury mechanisms necessitate early assessment within hours of birth.
- Early MR imaging (first 24 hours) is crucial for timely medical intervention.
Purpose of the Study:
- To evaluate early MR imaging findings in neonates with suspected hypoxic-ischemic brain injury.
- To assess the utility of proton MR spectroscopy and diffusion imaging in the first 24 hours of life.
- To correlate early MR findings with clinical outcomes.
Main Methods:
- Seven encephalopathic newborns underwent MR studies within 24 hours of birth.
- Standard T1, T2, and diffusion-weighted sequences were used; MR spectroscopy was performed in six patients.
- Follow-up MR studies were conducted in four patients at later time points.
Main Results:
- T1-weighted images were normal; T2 prolongation was seen in four patients.
- Diffusion imaging revealed abnormalities but underestimated injury extent compared to clinical course.
- MR spectroscopy showed elevated lactate in all six patients studied, indicating significant injury.
Conclusions:
- Early MR spectroscopy (within 24 hours) is sensitive to hypoxic-ischemic brain injury.
- Diffusion imaging can identify but may not fully capture the extent of early brain injury.
- Further research is needed to refine early MR assessment of neonatal brain injury.
Background And Purpose:
MR techniques have proved useful in assessing brain injury from perinatal asphyxia when the injury is subacute or chronic. Recent advances in understanding the molecular mechanisms of brain injury have made medical intervention plausible, creating a need for assessment of the brain within the first few hours of life. We report the results of early (first 24 hours after birth) MR imaging in seven patients, including proton MR spectroscopy in six.
Methods:
MR studies were performed within the first 24 hours of life in seven consecutive patients who were encephalopathic after complicated deliveries. Standard T1-, T2-, and diffusion-weighted sequences were performed in all patients; single-voxel MR spectroscopy was performed in two locations in six of the seven patients. Follow-up MR studies were performed in four patients at ages 7, 8, 9, and 15 days, respectively.
Results:
T1-weighted images were normal in all seven patients. T2-weighted images were normal in three patients and showed T2 prolongation in the basal ganglia or white matter in the other four. Diffusion images showed small abnormalities in the lateral thalami or internal capsules in all seven patients. Comparison with clinical course in all seven patients and with follow-up MR studies in four showed that the diffusion images underestimated the extent of brain injury. Proton MR spectroscopy showed substantial lactate elevation in all six of the patients studied. Two patients died in the neonatal period and the other five were left with clinically significant neurologic impairment.
Conclusion:
MR spectroscopy performed in the first 24 hours after birth is sensitive to the presence of hypoxic-ischemic brain injury, whereas diffusion imaging may help identify but underestimate the extent of the injury. Further studies are ongoing in an attempt to expand upon this observation.