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Memory implications of a "fornix white line" in HIV infection
Fred Ingram1, Leena Ketonen, David Paar
1Department of Psychiatry & Behavioral Sciences, University of Texas Medical Branch, USA. fredingram@yahoo.com
Abstract:
The "fornix white line" (FWL) is a brain abnormality detected on magnetic resonance imaging (MRI) in some people with human immunodeficiency virus (HIV) infection. This finding has previously been associated with clinical findings of cognitive disturbance, particularly regarding memory. The current study provides preliminary substantiation of the previously reported clinical finding of FWL-associated memory disturbance through formal psychometric evaluation over time. Specifically, despite comparable baseline performances, 8-10 months later subjects without the FWL improved performance on neuropsychological verbal memory testing, while subjects with the FWL declined; the magnitude of this dissociation on follow-up was 1.5 to 2.2 standard deviations. In contrast, general cognitive status, as assessed through performance on the Mini-Mental State Exam, remained comparable between groups and stable over time. Further, the comparable CD4 count and Karnofsky scores at baseline counters the argument that the FWL is simply a marker of HIV disease progression. These preliminary findings suggest the need for future research of the hypotheses raised thereby; particularly salient is the hypothesis that the FWL may serve as an earlier marker indicating anti-CMV treatment before memory impairment is clinically apparent.
Insights
The fornix white line (FWL), a brain abnormality in HIV infection, is linked to memory decline. Individuals with FWL showed worsening verbal memory over time, unlike those without it, suggesting FWL as an early indicator.
Area of Science:
- Neuroscience
- Infectious Diseases
- Radiology
Background:
- The fornix white line (FWL) is a brain abnormality observed on MRI in some individuals with HIV.
- Previous observations suggest an association between FWL and cognitive disturbances, particularly memory impairment.
Purpose of the Study:
- To provide preliminary substantiation of the FWL-associated memory disturbance through formal psychometric evaluation over time.
- To investigate if FWL is merely a marker of HIV disease progression.
Main Methods:
- Longitudinal neuropsychological testing focusing on verbal memory.
- Assessment of general cognitive status using the Mini-Mental State Exam.
- Comparison of CD4 counts and Karnofsky scores between groups with and without FWL.
Main Results:
- Subjects with FWL showed a decline in verbal memory performance over 8-10 months, while subjects without FWL improved.
- The magnitude of memory performance dissociation between groups was 1.5 to 2.2 standard deviations.
- General cognitive status and HIV disease markers (CD4 count, Karnofsky score) did not differ significantly between groups, suggesting FWL is not solely a marker of disease progression.
Conclusions:
- The fornix white line (FWL) is associated with a decline in verbal memory in individuals with HIV.
- FWL may serve as an early biomarker for potential intervention, such as anti-cytomegalovirus (CMV) treatment, before clinical memory impairment is evident.
- Further research is warranted to explore the etiological basis of FWL and its implications for neuroprotection in HIV.
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