MRI Score Ability to Detect Abnormalities in Mild Hypoxic-Ischemic Encephalopathy.

Area of Science:

• Neonatal Neurology
• Pediatric Radiology
• Neuroimaging

Background:

• Hypoxic-ischemic encephalopathy (HIE) is a major cause of neonatal brain injury.
• Established MRI scoring systems are validated for moderate/severe HIE but less evaluated for mild HIE.
• Subtle MRI abnormalities in mild HIE may indicate potential for long-term neurological deficits.

Purpose of the Study:

• To compare the diagnostic performance of three MRI scoring systems (Barkovich, NICHD NRN, Weeke) in infants with mild HIE.
• To assess the ability of these scores to detect abnormalities in varying severities of HIE.
• To evaluate inter-rater reliability of the scoring systems in this cohort.

Main Methods:

• Prospective cohort study of 42 infants (≥36 weeks gestation) with HIE.
• All infants underwent MRI on day five of life.
• Three experienced MRI readers independently applied Barkovich, NICHD NRN, and Weeke scores, blinded to clinical data.

Main Results:

• The Weeke score identified abnormalities in 57% of infants, compared to 24% for NICHD NRN and 7% for Barkovich.
• Subtle injuries in mild HIE cases were most frequently detected by the Weeke score.
• Excellent inter-rater agreement was observed for all three scores (k=1.0 for Barkovich, 0.92 for NICHD NRN, 0.9 for Weeke).

Conclusions:

• The Weeke score demonstrates superior sensitivity in detecting subtle MRI abnormalities in infants with mild HIE.
• Detailed MRI scoring systems are valuable for identifying brain injury in mild HIE.
• These findings support further research into therapeutic hypothermia for infants with mild HIE and subtle MRI findings.