Independent Risk Factors and Mortality Implications of De Novo Central Nervous System Involvement in Patients Hospitalized with Severe COVID-19: A Retrospective Cohort Study.

Background/Objectives : Central nervous system (CNS) involvement is a complication of COVID-19, adding to disease burden. The aim of this study is to identify the risk factors independently associated with CNS involvement in a cohort of patients hospitalized with severe forms of COVID-19 and the risk factors associated with all causes of in-hospital mortality and assess the impact of CNS involvement on in-hospital mortality of the severe COVID-19 patients. Methods : We performed a retrospective observational cohort study including adult patients with severe or critical forms of COVID-19 with and without new-onset CNS manifestations between March 2020 and December 2022. Results : We included 162 patients, 50 of which presented with CNS involvement. Independent risk factors for CNS involvement were female sex ( p = 0.04, OR 3.67, 95%CI 1.05-12.85), diabetes mellitus ( p = 0.008, OR 5.08, 95%CI 1.519-17.04)), lymphocyte count (0.04, OR 0.23, 95%CI 0.05-0.97), platelets count ( p = 0.001, OR 0.98, 95%CI 0.98-0.99) CRP value ( p = 0.04, OR 1.007, 95%CI 1.000-1.015), and CK value ( p = 0.004, OR 1.003, 95%CI 1.001-1.005). Obesity was a protective factor ( p < 0.001, OR 0.57, 95%CI 0.016-0.20). New-onset CNS manifestations ( p = 0.002, OR 14.48, 95%CI 2.58-81.23) were independent risk factors for in-hospital mortality. In-hospital mortality was higher in the new-onset CNS involvement group compared to patients without neurological involvement, 44% versus 7.1% ( p < 0.001). Conclusions : CNS involvement in severe COVID-19 patients contributes to all causes of in-hospital mortality. There are several risk factors associated with new-onset CNS manifestations and preventing and controlling them could have an important impact on patients' outcome.