Spectral power and coherence analysis of sleep EEG in AIDS patients: decrease in interhemispheric coherence

Area of Science:

• Neuroscience
• Sleep Medicine
• Infectious Diseases

Background:

• Acquired immunodeficiency syndrome (AIDS) can cause cerebral manifestations.
• Understanding the impact of AIDS on brain function during sleep is crucial.
• Electroencephalogram (EEG) is a key tool for assessing brain activity.

Purpose of the Study:

• To investigate sleep EEG characteristics in patients with AIDS and cerebral manifestations.
• To compare EEG power density and coherence between AIDS patients and healthy controls.
• To explore potential correlations between EEG findings and clinical features of AIDS.

Main Methods:

• All-night polysomnography with EEG recordings in 15 AIDS patients and 15 age-matched controls.
• Visual determination of sleep stages (NREM and REM).
• Spectral analysis of EEG power density and coherence across multiple derivations and frequency bands (0.25-24 Hz).

Main Results:

• Significantly lower EEG power density in the 11.5-13 Hz range during NREM sleep in AIDS patients compared to controls (p < 0.05, p < 0.01).
• No significant differences in REM sleep power density between groups.
• Markedly reduced interfrontal coherence across frequencies below 12 Hz in AIDS patients during both NREM and REM sleep (p < 0.01, p < 0.001).

Conclusions:

• AIDS patients exhibit distinct alterations in sleep EEG, particularly reduced NREM sleep power and interhemispheric coherence.
• These findings suggest disruptions in brain network function associated with cerebral manifestations of AIDS.
• Further research is needed to correlate these EEG changes with specific clinical symptoms and disease progression.