• Anna Markser, Jasper Vöckel, Alexa Schneider, Luise Baumeister-Lingens, Christine Sigrist, and Julian Koenig.
• University of Cologne, Faculty of Medicine and University Hospital Cologne, Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, Cologne, Germany.
• Am. J. Med. 2024 Jul 30.

AbstractAlongside the Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) pandemic, the number of patients with persistent symptoms following acute infection with SARS-CoV-2 is of concern. It is estimated that at least 65 million people worldwide meet criteria for what the World Health Organization (WHO) defines as "post-COVID-19 condition" - a multisystem disease comprising a wide range of symptoms. Effective treatments are lacking. In the present review, we aim to summarize the current evidence for the effectiveness of non-invasive or minimally invasive brain stimulation techniques in reducing symptoms of post-COVID-19. A total of nineteen studies were identified, one using transcutaneous vagus nerve stimulation (tVNS), another using transorbital alternating current stimulation (toACS), six studies on transcranial magnetic stimulation (TMS) and eleven studies on transcranial direct current stimulation (tDCS) for the treatment of post-COVID-19 symptoms. Existing studies report first promising results, illustrating improvement in clinical outcome parameters. Yet, the mechanistic understanding of post-COVID-19 and how brain stimulation techniques may be benefitial are limited. Directions for future research in the field are discussed.Copyright © 2024. Published by Elsevier Inc.

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