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The AIDS dementia complex: II. Neuropathology.

B A Navia, E S Cho, C K Petito

    Annals of Neurology
    |June 1, 1986
    PubMed
    Summary

    The AIDS dementia complex involves significant brain abnormalities, primarily in white matter, often correlating with dementia severity. This study identifies it as a distinct pathological entity potentially caused by direct brain infection.

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    Factors associated with neurocognitive test performance at baseline: a substudy of the INSIGHT Strategic Timing of AntiRetroviral Treatment (START) trial.

    HIV medicine·2015

    Area of Science:

    • Neuropathology
    • Infectious Diseases
    • Neuroscience

    Background:

    • Dementia frequently complicates acquired immune deficiency syndrome (AIDS).
    • Understanding the neuropathological basis of AIDS dementia is crucial for diagnosis and treatment.
    • Previous studies suggested a link between HIV and neurological dysfunction, but specific pathological substrates were not fully elucidated.

    Purpose of the Study:

    • To define the histopathological substrate of dementia in acquired immune deficiency syndrome (AIDS).
    • To correlate neuropathological findings with clinical dementia severity in AIDS patients.
    • To investigate the role of opportunistic infections like cytomegalovirus (CMV) in AIDS-related neurological complications.

    Main Methods:

    • Analysis of neuropathological findings in 70 autopsied adult AIDS patients.
    • Clinical assessment of dementia severity in 46 patients.
    • Histopathological examination of brain tissue, including white matter, subcortical structures, and cortex.
    • Assessment for cytomegalovirus (CMV) infection and vacuolar myelopathy.

    Main Results:

    • Abnormalities were predominantly found in white matter and subcortical structures, with relative cortical sparing.
    • The frequency and severity of neuropathology correlated with clinical dementia.
    • Diffuse white matter pallor, perivascular infiltrates, foamy macrophages, and rarefaction were common findings.
    • Vacuolar myelopathy was present in 23 patients, often more severe with advanced brain pathology.
    • CMV infection was noted in nearly a quarter of brains but did not correlate with major neuropathology or dementia, suggesting a superimposed process.

    Conclusions:

    • The AIDS dementia complex is a distinct clinical and pathological entity.
    • Neuropathological findings suggest direct LAV/HTLV-III brain infection as the cause.
    • CMV infection represents a separate, superimposed pathological process in some AIDS patients.
    • Subclinical neuropathological changes occur in a significant proportion of non-demented AIDS patients.

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