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Apparent diffusion coefficient pseudonormalization time in neonatal hypoxic-ischemic encephalopathy.

Jeff D Winter1, David S Lee, Ryan M Hung

  • 1Imaging Division, Lawson Health Research Institute, University of Western Ontario, London, Ontario, Canada.

Pediatric Neurology
|October 2, 2007
PubMed
Summary
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Apparent diffusion coefficient (ADC) values in neonates with hypoxic-ischemic encephalopathy normalize later than expected. This study identifies pseudonormalization times, crucial for understanding brain injury progression in newborns.

Area of Science:

  • Neuroscience
  • Neonatal Medicine
  • Radiology

Background:

  • Hypoxic-ischemic encephalopathy (HIE) is a major cause of neonatal brain injury.
  • Apparent diffusion coefficient (ADC) is a sensitive marker of tissue water diffusion, reflecting cellular integrity.
  • ADC values change dynamically after HIE, complicating interpretation.

Purpose of the Study:

  • To quantitatively assess the relationship between ADC and postnatal age in neonates with HIE and poor outcomes.
  • To determine the pseudonormalization time, when ADC values in HIE neonates become indistinguishable from controls.
  • To establish the temporal profile of ADC changes in neonatal HIE.

Main Methods:

  • Diffusion-weighted imaging (DWI) data from term neonates with HIE (n=12) and controls (n=30) were analyzed.

Related Experiment Videos

  • Correlation between ADC and postnatal age was examined in multiple brain regions.
  • Pseudonormalization times were calculated using regression analysis and intrasubject changes.

    • Main Results:

    • Pseudonormalization times ranged from 8.3 ± 1.9 to 10.1 ± 2.1 days postnatally based on regression.
    • Intrasubject analysis yielded slightly longer pseudonormalization times (approx. 1 day).
    • Abnormally decreased ADC values were observed from ~2 days to 1 week, while elevated values appeared later, in the second week.

    Conclusions:

    • ADC abnormalities in neonatal HIE exhibit a complex temporal pattern.
    • Elevated ADC values may persist or emerge later in the neonatal period, potentially indicating ongoing or delayed injury.
    • Understanding these ADC dynamics is vital for accurate HIE assessment and outcome prediction.