COVID-19 in the nervous system: physiopathology and neurological manifestations

BACKGROUND

Coronavirus disease 2019 (COVID-19) is a viral infection caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Although respiratory manifestations have received greater visibility during the pandemic caused by this virus, numerous neurological complaints related to coronavirus 2 infection have been documented in several countries. These records suggest that this pathogen presents neurotropism, and it can cause different neurological conditions of varying intensity.

OBJECTIVE

To investigate the ability of coronavirus 2 to invade the central nervous system (CNS) and its neurological clinical outcomes.

METHODS

The present study consists in a comprehensive literature review of the records available in the PubMed, SciELO, and Google Scholar databases. The descriptors COVID-19, brain and physiopathology, associated with the Boolean operator AND, were used in the search. Regarding the inclusion and exclusion criteria, we selected the papers published since 2020 with the highest number of citations.

RESULTS

We selected 41 articles, most of them in English. The main clinical manifestation associated with COVID-19 patients was headache, but cases of anosmia, hyposmia, Guillain-Barré syndrome, and encephalopathies were also described with considerable frequency.

CONCLUSION

Coronavirus-2 presents neurotropism, and it can reach the CNS by hematogenous dissemination and by direct infection of the nerve endings. It causes brain injuries through several mechanisms, such as cytokine storm, microglial activation, and an increase in thrombotic factors.

First stages towards the establishment of Brazilian neurology faculties

ABSTRACT The establishment of modern medicine in Brazil was marked by the arrival of the Portuguese Court in 1808, when the Bahia and Rio de Janeiro Faculties of Medicine were founded. The French School of Medicine exerted a strong influence on Brazilian medicine and on the main pioneers of Brazilian neurology. The elite of “Parisian neurology” trained students and doctors from around the world, and were mentors to the pioneers of Brazilian neurology in the early 20th century. In this article, the authors review the origins of neurology faculties in Brazilian medicine and the main pioneers of Brazilian neurology. Neurology is certainly a continuously changing field and has always adapted to new advances and discoveries, and it is an honor for the authors to pay homage to their pioneers.

Camillo Negro and his contributions to neurology

ABSTRACT An historical review of the contributions made by Italian professor, Camillo Negro, to neurology. Negro published several books on clinical neurology, was one of the pioneers of scientific films and described numerous neurological diseases. He is best known for describing the cogwheel phenomenon in patients with Parkinson's disease but also described a sign of peripheral facial paralysis.