Neuropsychological Dysfunction in HIV Infection:A Review

Area of Science:

• Neuroscience
• Psychology
• Infectious Diseases

Background:

• Central nervous system (CNS) dysfunction is a known complication of HIV infection.
• Neuropsychological testing is crucial for identifying cognitive deficits associated with HIV.

Purpose of the Study:

• To review and synthesize findings from neuropsychological studies investigating cognitive function in HIV-positive (HIV+) individuals compared to HIV-negative (HIV-) controls.
• To examine cognitive deficits across different domains and disease stages (asymptomatic vs. symptomatic).

Main Methods:

• Systematic review of 56 studies using neuropsychological tests to assess CNS dysfunction in HIV.
• Inclusion criteria: studies comparing HIV+ and HIV- subjects using analysis of variance (ANOVA).
• Analysis of results by broad neuropsychological domains and subject status (asymptomatic/symptomatic).

Main Results:

• Asymptomatic HIV+ subjects showed deficits in verbal memory (27%), executive function (43%), motor performance (20%), and information processing (44%).
• Symptomatic HIV+ subjects exhibited more widespread deficits: verbal memory (48%), visual memory (43%), executive functioning (71%), complex attention (62%), motor performance (37%), and information processing (69%).
• Deficits were observed prior to the onset of clinically apparent dementia.

Conclusions:

• HIV infection is associated with significant neuropsychological deficits, even in asymptomatic individuals.
• Cognitive impairment worsens with disease progression and affects multiple functional domains.
• Frontal lobe-associated cognitive tests were more sensitive in detecting these deficits.