Quantitative proton MRS predicts outcome after traumatic brain injury.
OBJECTIVE
To determine whether proton MRS (1H-MRS) neurochemical measurements predict neuropsychological outcome of patients with traumatic brain injury (TBI).


BACKGROUND
Although clinical indices and conventional imaging techniques provide critical information for TBI patient triage and acute care, none accurately predicts individual patient outcome.


METHODS
The authors studied 14 patients with TBI soon after injury (45+/-21 days postinjury) and again at 6 months (172+/-43 days) and 14 age-, sex-, and education-matched control subjects. N-acetylaspartate (NAA), creatine, and choline were measured in normal-appearing occipitoparietal white and gray matter using quantitative 1H-MRS. Outcome was assessed with the Glasgow Outcome Scale (GOS) and a battery of neuropsychological tests. A composite measure of neuropsychological function was calculated from individual test z-scores probing the major functional domains commonly impaired after head trauma.


RESULTS
Early NAA concentrations in gray matter predicted overall neuropsychological performance (r = 0.74, p = 0.01) and GOS (F = 11.93, p = 0.007). Other metabolite measures were not related to behavioral function at outcome.


CONCLUSIONS
1H-MRS provides a rapid, noninvasive tool to assess the extent of diffuse injury after head trauma, a component of injury that may be the most critical factor in evaluating resultant neuropsychological dysfunction. 1H-MRS can be added to conventional MR examinations with minimal additional time, and may prove useful in assessing injury severity, guiding patient care, and predicting patient outcome.
Friedman
S D
SD
Clinical and Magnetic Resonance Research Center, Department of Psychology, University of New Mexico, Albuquerque 87131, USA.
Brooks
W M
WM
Jung
R E
RE
Chiulli
S J
SJ
Sloan
J H
JH
Montoya
B T
BT
Hart
B L
BL
Yeo
R A
RA
D000293:Adolescent; D000328:Adult; D000368:Aged; D001921:Brain / Q000378:metabolism; D001930:Brain Injuries / Q000378:metabolism* / Q000503:physiopathology / Q000523:psychology; D005260:Female; D006801:Humans; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009483:Neuropsychological Tests; D011379:Prognosis; D011522:Protons
D011522:Protons