Impact of therapeutic hypothermia on MRI diffusion changes in neonatal encephalopathy

N. Bednarek, A. Mathur, T. Inder, J. Wilkinson, J. Neil, J. Shimony

Research output: Contribution to journalReview articlepeer-review

109 Scopus citations

Abstract

Objective: The objective of this work was to determine the impact of therapeutic hypothermia (TH) on the magnitude and time course of mean diffusivity (MD) changes following hypoxic-ischemic encephalopathy (HIE) in newborns. Methods: Cerebral MRI scans of infants undergoing whole body TH for HIE from 2007 to 2010 were retrospectively reviewed. The data were analyzed identically to a control group of newborns with HIE previously published, prior to the development of TH. Anatomic injury was defined on T1-and T2-weighted ("late") MRI obtained after the fifth day of life. Since MD values vary regionally, the ratios of MD values for injured and normal tissue were calculated for areas of injury. Normal values were obtained from corresponding brain regions of 12 infants undergoing TH who had no injury on MRI studies. Results: Twenty-three of 59 infants who underwent TH and MRI displayed cerebral injury on late MRI and were included in the study. MD ratios were decreased in all injured infants within the first 7 days of life. The return of MD to normal (pseudonormalization) occurred after the tenth day as compared to 6-8 days in the control group. Infants with severest injury demonstrated greater reduction in MD, but no difference in time to pseudonormalization. Conclusion: TH slows the evolution of diffusion abnormalities on MRI following HIE in term infants.

Original languageEnglish
Pages (from-to)1420-1427
Number of pages8
JournalNeurology
Volume78
Issue number18
DOIs
StatePublished - May 1 2012

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