AIDS dementia complex: evaluation with proton MR spectroscopic imaging

Area of Science:

• Neuroimaging
• Biochemistry
• Infectious Diseases

Background:

• Acquired immunodeficiency syndrome dementia complex (ADC) is a neurological complication of HIV infection.
• Conventional MR imaging may not fully capture the extent of metabolic changes in ADC.
• Understanding these changes is crucial for diagnosis and management.

Purpose of the Study:

• To investigate cerebral metabolic alterations in ADC using proton magnetic resonance (MR) spectroscopic imaging.
• To compare the sensitivity of MR spectroscopic imaging with conventional MR imaging in detecting ADC-related central nervous system involvement.

Main Methods:

• Seven male patients diagnosed with ADC and seven age-matched HIV-negative volunteers participated.
• Both groups underwent conventional MR imaging and proton MR spectroscopic imaging.
• Spectroscopic data were analyzed for metabolic profiles in white-matter regions and cerebrospinal fluid.

Main Results:

• ADC patients exhibited reduced N-acetyl aspartate and elevated choline levels in white matter.
• Lactate was detected in the cerebrospinal fluid of five ADC patients.
• Metabolic abnormalities were more pronounced in patients with moderate dementia compared to those with mild neurocognitive changes.

Conclusions:

• Proton MR spectroscopic imaging effectively demonstrates widespread metabolic changes in ADC.
• MR spectroscopic imaging is more sensitive than conventional MR imaging for detecting CNS involvement in ADC.
• This technique offers a valuable tool for assessing the neurological impact of HIV infection.