Experience of diffusion tensor imaging and 1H spectroscopy for outcome prediction in severe traumatic brain injury: Preliminary results.

Abstract:

OBJECTIVE:The objective of the study is to test whether multimodal magnetic resonance imaging can provide a reliable outcome prediction of the clinical status, focusing on consciousness at 1 year after severe traumatic brain injury (TBI). DESIGN:Single center prospective cohort with consecutive inclusions. SETTING:Critical Care Neurosurgical Unit of a university hospital. PATIENTS:Forty-three TBI patients not responding to simple orders after sedation cessation and 15 healthy controls. INTERVENTIONS:A multimodal magnetic resonance imaging combining morphologic sequences, diffusion tensor imaging (DTI), and H proton magnetic resonance spectroscopy (MRS) was performed 24 +/- 11 days after severe TBI. The ability of DTI and MRS to predict 1-year outcome was assessed by linear discriminant analysis (LDA). Robustness of the classification was tested using a bootstrap procedure. MEASUREMENTS AND MAIN RESULTS:Fractional anisotropy (FA) was computed as the mean of values at discrete brain sites in the infratentorial and supratentorial regions. The N-acetyl aspartate/creatine (NAA/Cr) ratio was measured in the thalamus, lenticular nucleus, insular cortex, occipital periventricular white matter, and pons. After 1 year, 19 (44%) patients had unfavorable outcomes (death, persistent vegetative state, or minimally conscious state) and 24 (56%) favorable outcomes (normal consciousness with or without functional impairments). Analysis of variance was performed to compare FA and NAA/Cr in the two outcome groups and controls. FA and MRS findings showed highly significant differences between the outcome groups, with significant variables by LDA being supratentorial FA, NAA/Cr (pons), NAA/Cr (thalamus), NAA/Cr (insula), and infratentorial FA. LDA of combined FA and MRS data clearly separated the unfavorable outcome, favorable outcome, and control groups, with no overlap. Unfavorable outcome was predicted with up to 86% sensitivity and 97% specificity; these values were better than those obtained with DTI or MRS alone. CONCLUSION:FA and NAA/Cr hold potential as quantitative outcome-prediction tools at the subacute phase of TBI.

journal_name

Crit Care Med

journal_title

Critical care medicine

authors

Tollard E,Galanaud D,Perlbarg V,Sanchez-Pena P,Le Fur Y,Abdennour L,Cozzone P,Lehericy S,Chiras J,Puybasset L

doi

10.1097/CCM.0b013e31819cf050

subject

Has Abstract

pub_date

2009-04-01 00:00:00

pages

1448-55

issue

4

eissn

0090-3493

issn

1530-0293

journal_volume

37

pub_type

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