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Localised proton magnetic resonance spectroscopy of the brain after perinatal hypoxia: a preliminary report.

Abstract：

OBJECTIVES:Perinatal hypoxic ischaemic injury is a significant cause of neurodevelopmental impairment. The aim of this study was to evaluate localised proton magnetic resonance spectroscopy (1H-MRS) after birth asphyxia. MATERIALS AND METHODS:Thirty newborn infants suspected of having perinatal asphyxia (Apgar score < 3) were studied. The mean gestational age was 37 weeks, mean age at the MR examination was 18 days and mean weight was 2.9 kg. A 1.5-T unit was used for imaging and spectroscopy. None of the babies had mechanically assisted ventilation. No sedation was used. Axial T1-weighted and T2-weighted images were obtained. 1H-MRS was recorded in a single voxel, localised in white matter, using a STEAM sequence. RESULTS:Image quality was good in 25 of 30 babies. 1H-MRS was performed in 19 of 30 subjects, with adequate quality in 16. Choline, creatine/phosphocreatine and N-acetylaspartate peaks and peak-area ratios were analysed. Lactate was detected in four infants. The N-acetylaspartate/choline ratio was lower in infants with an impaired neurological outcome, but the difference was not statistically significant. CONCLUSIONS:This study suggests that 1H-MRS may be useful for assessing cerebral metabolism in the neonate. A raised lactate level and decreased N-acetylaspartate/choline ratio may be predictive of a poor outcome. However, in our experience this method is limited by the difficulty in performing the examination during the first hours after birth in critically ill babies, the problems related to use of a monovoxel sequence, the dispersion of the ratios and the lack of determination of the absolute concentration of the metabolites.

journal_name

Pediatr Radiol

journal_title

Pediatric radiology

authors

Chateil JF,Quesson B,Brun M,Thiaudière E,Sarlangue J,Delalande C,Billeaud C,Canioni P,Diard F

doi

10.1007/s002470050572

keywords:

subject

Has Abstract

pub_date

1999-03-01 00:00:00

pages

199-205

issue

3

eissn

0301-0449

issn

1432-1998

journal_volume

29

pub_type

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