Role of brain metabolites during acute phase of mild traumatic brain injury in prognosis of post-concussion syndrome: A 1H-MRS study.
Level 3 - non-randomized controlled study
Prospective cohort/prognostic study with a control group
PubMed 37688998 · doi:10.1016/j.pscychresns.2023.111709
What was done
Forty-eight adult patients with a single mild traumatic brain injury (mTBI) and normal routine brain scans, alongside 24 control volunteers, underwent brain proton magnetic resonance spectroscopy (1H-MRS) across regions of interest (ROIs) and a stop signal task within 72 hours of injury. Participants were followed up at six months to evaluate the presence and severity of post-concussion syndrome (PCS).
What was found
Non-PCS patients exhibited significantly higher N-acetyl aspartate (NAA) levels in the dorsolateral prefrontal cortex (DLPFC) and anterior cingulate cortex (ACC) compared to controls, and higher NAA across all ROIs compared to the PCS group. The PCS cohort showed marked reductions in creatine (Cr) across all ROIs and reduced choline (Cho) in the corpus callosum compared to controls and non-PCS patients. NAA and NAA/Cho ratios in the ACC were identified as the primary predictors of PCS occurrence, while the Cho/Cr ratio in the ACC best predicted PCS severity. ACC metabolite measures provided higher predictive accuracy than other tested brain regions. Exact numerical values, test statistics, and p-values were not reported in the abstract.
Why it matters
Early MRS-detected metabolic alterations in the ACC may help identify patients at risk of chronic symptoms following mTBI despite normal routine structural neuroimaging.
Limits
The sample size was small (48 mTBI cases, 24 controls). The abstract omits exact metabolite concentrations, predictive metrics (such as sensitivity, specificity, AUC, or odds ratios), and details on how PCS was clinically diagnosed or quantified. Long-term functional outcomes beyond six months were not assessed.
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