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Facility-Measured Sleep Electroencephalographic Microstructures in Long COVID.

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Long COVID and ME/CFS patients exhibit altered sleep EEG microstructures, including abnormal slow oscillations and spindle activity, indicating potential pathobiology. These findings highlight sleep disturbances as a key feature in post-infectious syndromes.

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Area of Science:

  • Neuroscience
  • Sleep Medicine
  • Chronic Illness Research

Background:

  • Sleep electroencephalographic (EEG) microstructures offer insights into brain function.
  • Non-restorative sleep and fatigue are hallmark symptoms of long COVID (LC) and myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS).
  • Understanding sleep EEG differences may elucidate the pathobiology of these conditions.

Purpose of the Study:

  • To characterize sleep EEG microstructural differences in individuals with LC and ME/CFS compared to healthy controls (HC).
  • To investigate specific EEG parameters such as spectral band powers, spindles, slow oscillations (SO), spindle-SO coupling, brain age index (BAI), alpha-delta patterns, and infraslow oscillation relative band power (ISO).

Main Methods:

  • Utilized overnight polysomnography (PSG) in a laboratory setting.
  • Analyzed sleep EEG data from 28 LC participants, 28 HC participants, and 19 ME/CFS participants.
  • Extracted quantitative measures of sleep EEG microstructures, including spectral power, oscillatory activity, and coupling dynamics.

Main Results:

  • LC patients showed higher SO power during wake and REM sleep, faster spindle frequency drop, and shorter SO peak duration compared to HC.
  • LC exhibited widespread, early spindle-SO coupling, with early fast spindle-SO coupling linked to poorer sleep quality.
  • ME/CFS patients displayed distinct patterns, including higher SO-uncoupled slow spindle densities, more alpha-delta patterns, and elevated ISO power.

Conclusions:

  • Sleep EEG microstructural changes in LC and ME/CFS suggest plausible pathological alterations.
  • These findings contribute to understanding the neurobiological impact of post-infectious processes on brain activity.
  • The study highlights distinct yet overlapping sleep abnormalities in LC and ME/CFS, warranting further investigation.