Reduced Global Cerebral Blood Flow in Non-Demented HIV Positive Patients

Area of Science:

• Neuroscience
• Infectious Diseases
• Radiology

Background:

• Human immunodeficiency virus (HIV) infection can affect the central nervous system.
• Cerebral blood flow (CBF) alterations may occur in individuals with HIV.
• Understanding these changes is crucial for managing neurological complications in HIV.

Purpose of the Study:

• To investigate cerebral blood flow patterns in non-demented HIV-positive men.
• To compare CBF in HIV-positive individuals with varying degrees of immunodeficiency to healthy controls.
• To determine if CBF reduction correlates with disease progression in HIV.

Main Methods:

• Single photon emission computed tomography (SPECT) was used to assess relative global and regional cerebral blood flow.
• Twelve non-demented HIV-positive men with different immunodeficiency levels were studied.
• Comparison was made with healthy HIV-negative control subjects.

Main Results:

• HIV-positive patients exhibited significantly reduced relative global cerebral blood flow compared to controls (p = 0.014).
• Altered cerebral flow distribution was observed, with lower global flow relative to central flow (p = 0.01), most notable in early disease stages.
• In advanced HIV disease, 93% of investigated regions showed lower relative cerebral blood flow compared to controls.

Conclusions:

• Non-demented HIV-positive individuals demonstrate significant reductions in global cerebral blood flow.
• Cerebral blood flow distribution is altered, with a pattern more pronounced in earlier stages of HIV disease.
• These findings suggest that cerebral hypoperfusion is a common feature of HIV infection, even in the absence of dementia.