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Abstract

Neurometabolism of active neuropsychiatric lupus determined with proton MR spectroscopy.

W L Sibbitt, L J Haseler, R R Griffey, S D Friedman and W M Brooks
American Journal of Neuroradiology August 1997, 18 (7) 1271-1277;
W L Sibbitt Jr
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L J Haseler
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R R Griffey
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S D Friedman
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W M Brooks
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Abstract

PURPOSE To determine the neurometabolism of patients with active neuropsychiatric systemic lupus erythematosus (NPSLE) by using proton MR spectroscopy.

METHODS Thirty-six patients with SLE and eight control subjects were studied with proton MR spectroscopy to measure brain metabolites. Peaks from N-acetylaspartate (NAA), creatine (Cr), choline (Cho), and at 1.3 parts per million (ppm) lipid, macromolecules, and lactate were measured. Patients were classified as having major NPSLE (seizures, psychosis, major cognitive dysfunction, delirium, stroke, or coma) (n = 15) or minor NPSLE (headache, minor affective disorder, or minor cognitive disorder) (n = 21). Patients with major NPSLE were severely ill and hospitalized.

RESULTS SLE patients had lower NAA and increased metabolites at 1.3 ppm than did control subjects (NAA/Cr(SLE) = 1.90 +/- 0.35, NAA/Cr(Control) = 2.16 +/- 0.26; 1.3 ppm/Cr(SLE) = 0.49 +/- 0.41, 1.3 ppm/Cr(Control) = 0.27 +/- 0.05). NAA/Cr in patients with current or prior major NPSLE was lower than in patients without major NPSLE. Increased peaks at 1.3 ppm were present in all SLE subgroups, but particularly in patients with major NPSLE. These resonances were not evident at an echo time of 136, indicating that these signals were not lactate.

CONCLUSION Major NPSLE, past or present, is associated with decreased levels of NAA. Elevated peaks around 1.3 ppm do not represent lactate even in severely ill patients, indicating that global ischemia is not characteristic of NPSLE. Neurochemical markers determined by MR spectroscopy may be useful for determining activity and degree of brain injury in NPSLE.

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American Journal of Neuroradiology
Vol. 18, Issue 7
1 Aug 1997
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Neurometabolism of active neuropsychiatric lupus determined with proton MR spectroscopy.
W L Sibbitt, L J Haseler, R R Griffey, S D Friedman, W M Brooks
American Journal of Neuroradiology Aug 1997, 18 (7) 1271-1277;

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Neurometabolism of active neuropsychiatric lupus determined with proton MR spectroscopy.
W L Sibbitt, L J Haseler, R R Griffey, S D Friedman, W M Brooks
American Journal of Neuroradiology Aug 1997, 18 (7) 1271-1277;
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