Diffusion-weighted imaging and proton magnetic resonance spectroscopy in perinatal hypoxic-ischemic encephalopathy: association with neuromotor outcome at 18 months of age

J Child Neurol. 2004 Nov;19(11):872-81. doi: 10.1177/08830738040190110501.

Abstract

We evaluated early diffusion-weighted imaging findings, the quantitative apparent diffusion coefficient, and magnetic resonance spectroscopy (the presence of lactate and ratios of N-acetylaspartate to total creatine and choline to total creatine) in the prediction of the 18-month neuromotor outcome of term newborns with hypoxic-ischemic encephalopathy. Conventional T1- and T2-weighted and diffusion-weighted imaging was performed in 20 asphyxiated term newborns, with additional basal ganglia magnetic resonance spectroscopy in 15 newborns between 2 and 18 days of life (mean 7.3 days). Neuromotor outcome was dichotomized into normal and abnormal for statistical analysis. Statistically significant differences in the ratios of N-acetylaspartate to total creatine, but not apparent diffusion coefficient values and ratios of choline to total creatine, were found between infants with a normal and an abnormal outcome (Mann-Whitney U-test, P = .010). There was a significant association between the presence of a lactate peak and an abnormal outcome (chi-square test, P = .017). The presence of a lactate peak for predicting an abnormal outcome had a sensitivity of 100% and a specificity of 80%, and the odds ratio was 37.4. Ischemic lesions were more conspicuous and/or extensive on diffusion-weighted imaging in all except one neonate. The presence of normal findings on both diffusion-weighted imaging and conventional magnetic resonance imaging is predictive of a normal neuromotor outcome, whereas lactate and a reduced ratio of N-acetylaspartate to total creatine in the basal ganglia, but not an apparent diffusion coefficient, are associated with an abnormal outcome at 18 months of age.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aspartic Acid / analogs & derivatives*
  • Aspartic Acid / analysis
  • Asphyxia Neonatorum / diagnosis*
  • Asphyxia Neonatorum / physiopathology
  • Basal Ganglia / pathology
  • Brain / pathology*
  • Choline / analysis
  • Creatine / analysis
  • Diffusion Magnetic Resonance Imaging*
  • Energy Metabolism / physiology*
  • Female
  • Follow-Up Studies
  • Humans
  • Hypoxia, Brain / diagnosis*
  • Hypoxia, Brain / physiopathology
  • Infant
  • Infant, Newborn
  • Lactic Acid / analysis
  • Magnetic Resonance Spectroscopy*
  • Male
  • Neurologic Examination / statistics & numerical data*
  • Predictive Value of Tests
  • Statistics as Topic

Substances

  • Aspartic Acid
  • Lactic Acid
  • N-acetylaspartate
  • Creatine
  • Choline