Abstract
Among the most common post-COVID symptoms, many patients experienced subjective cognitive deficit, commonly named "brain fog," that might be present also in those individuals without severe acute COVID-19 respiratory involvement. Some studies have investigated some of the mechanisms that might be associated with the brain fog with objective techniques including transcranial magnetic stimulation and neuroimaging. The aim of this studywas to investigate the presence of electroencephalographic (EEG) alterations in people with post-COVID self-reportedcognitive deficit. Out of the 90 patients attending the post-COVID neurology ambulatory service, twenty patientspresenting brain fog at least 4 weeks after acute non-severe COVID-19 infection, and without previous history of epilepsy,were investigated with 19-channel EEG, Montreal Cognitive Assessment (MoCA), and magnetic resonance imaging (MRI).EEG was found altered in 65% of the sample, among which 69% presented a slowing activity and 31% were characterizedby epileptic discharges principally in the frontal areas. None of the patients showed DWI MRI lesions. These findings highlight the usefulness of EEG analysis to objectively describe possible neurophysiological abnormalities in post-COVID patients presenting subjective cognitive deficit.
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