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Recent:   

Cognition and Memory after Covid-19 in a Large Community Sample

Hampshire et al., New England Journal of Medicine, doi:10.1056/NEJMoa2311330
Feb 2024  
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Observational study of 112,964 adults in England completing an online cognitive assessment, showing significant cognitive deficits persisting over a year after COVID-19. The largest deficits were seen with hospitalization and unresolved prolonged symptoms. Early pandemic infection and the original SARS-CoV-2 strain was associated with greater deficits.
ICU admission was associated with an equivalent of −9 IQ points, with the probability of a score that was more than 30 IQ points lower being 3.6 times as high as that in the no COVID-19 group.
Hampshire et al., 29 Feb 2024, United Kingdom, peer-reviewed, 14 authors, study period 1 December, 2020 - 30 April, 2021. Contact: a.hampshire@imperial.ac.uk, p.elliott@imperial.ac.uk.
This PaperMiscellaneousAll
Cognition and Memory after Covid-19 in a Large Community Sample
Adam Hampshire, Adriana Azor, Christina Atchison, William Trender, Peter J Hellyer, Valentina Giunchiglia, Masud Husain, Graham S Cooke, Emily Cooper, Adam Lound, Christl A Donnelly, Marc Chadeau-Hyam, Helen Ward, Paul Elliott
New England Journal of Medicine, doi:10.1056/nejmoa2311330
Cognitive symptoms after coronavirus disease 2019 (Covid-19), the disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), are well-recognized. Whether objectively measurable cognitive deficits exist and how long they persist are unclear. METHODS We invited 800,000 adults in a study in England to complete an online assessment of cognitive function. We estimated a global cognitive score across eight tasks. We hypothesized that participants with persistent symptoms (lasting ≥12 weeks) after infection onset would have objectively measurable global cognitive deficits and that impairments in executive functioning and memory would be observed in such participants, especially in those who reported recent poor memory or difficulty thinking or concentrating ("brain fog"). RESULTS Of the 141,583 participants who started the online cognitive assessment, 112,964 completed it. In a multiple regression analysis, participants who had recovered from Covid-19 in whom symptoms had resolved in less than 4 weeks or at least 12 weeks had similar small deficits in global cognition as compared with those in the no-Covid-19 group, who had not been infected with SARS-CoV-2 or had unconfirmed infection (-0.23 SD [95% confidence interval {CI}, -0.33 to -0.13] and -0.24 SD [95% CI, -0.36 to -0.12], respectively); larger deficits as compared with the no-Covid-19 group were seen in participants with unresolved persistent symptoms (-0.42 SD; 95% CI, -0.53 to -0.31). Larger deficits were seen in participants who had SARS-CoV-2 infection during periods in which the original virus or the B.1.1.7 variant was predominant than in those infected with later variants (e.g., -0.17 SD for the B.1.1.7 variant vs. the B.1.1.529 variant; 95% CI, -0.20 to -0.13) and in participants who had been hospitalized than in those who had not been hospitalized (e.g., intensive care unit admission, -0.35 SD; 95% CI, -0.49 to -0.20). Results of the analyses were similar to those of propensity-score-matching analyses. In a comparison of the group that had unresolved persistent symptoms with the no-Covid-19 group, memory, reasoning, and executive function tasks were associated with the largest deficits (-0.33 to -0.20 SD); these tasks correlated weakly with recent symptoms, including poor memory and brain fog. No adverse events were reported. CONCLUSIONS Participants with resolved persistent symptoms after Covid-19 had objectively measured cognitive function similar to that in participants with shorter-duration symptoms, although short-duration Covid-19 was still associated with small cognitive deficits after recovery. Longer-term persistence of cognitive deficits and any clinical implications remain uncertain.
Appendix The authors' full names and academic degrees are as follows: Adam Hampshire
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