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Abstract #1119

NAA Factor Scores Suggest Neuronal Recovery During Antiretroviral Therapy: an MRSI Study

Margaret R. Lentz, Ph.D. 1, Mona A. Mohamed, M.D., Ph.D. 2, Mahaveer N. Degaonkar, Ph.D. 2, Vallent Lee, B.A. 1, Hyun Kim, B.S. 1, Elkan Halpern, Ph.D. 1, Ned Sacktor, M.D. 3, Ola Selnes, Ph.D. 3, Peter B. Barker, D.Phil. 2, Martin G. Pomper, M.D., Ph.D. 2

1Departments of Neuroradiology and the A. A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, USA; 2Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins Medical Institutions, Baltimore, MD, USA; 3Department of Neurology, Johns Hopkins Medical Institutions, Baltimore, MD, USA

Longitudinal magnetic resonance and cognition studies are lacking with respect to the effects of anti-retroviral therapy (ART) use in chronically HIV-infected subjects, especially those with HIV-associated cognitive impairment. An NAA factor (previously determined to be predictive of dementia) was found to improve in HIV-infected subjects after 3 and 10 months of ART, suggesting a reprieve of neuronal dysfunction. However, glial metabolism, represented by a choline factor, and cognitive impairment, remained unchanged. These results suggest that the rate of recovery of cognitive function is slower than that of neuronal metabolism, perhaps due to persistent low-level infection/inflammation.