Potential Cognitive Function Decline Following SARS-CoV-2 Infection
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Reviewed by Dat Tien Nguyen, B.A, ScM.
Translated by Nhi Phuong Quynh Le, B.A |
Posted on April 8th, 2024
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There have been widespread reports indicating a potential link between prior SARS-CoV-2 infection and a reduction in cognitive and memory function. However, empirical evidence supporting this association remains scarce. Consequently, the National Institute for Health and Care Research, situated in the United Kingdom, initiated an observational study aimed at elucidating the effects of SARS-CoV-2 infection on memory and cognitive function.
The research involved over 100,000 participants residing in England who had contracted the SARS-CoV-2 virus between August and December of 2022. The determination of infection status relied on various methods, including PCR testing, lateral flow immunoassays, or self-reporting by the individuals. Cognitive function was evaluated through an online computerized assessment, encompassing tests for immediate memory, mental manipulation, spatial memory, and verbal reasoning, among others. Findings indicated minimal differences in cognitive function among individuals whose symptoms resolved within less than 4 months, those whose symptoms persisted for 12 months, and those who had not been infected with SARS-CoV-2. Notably, individuals experiencing prolonged symptoms beyond 12 months exhibited the most significant decline in cognition. Moreover, the severity of the infection was found to impact cognitive ability, with hospitalized patients displaying poorer performance compared to those treated at home. Interestingly, individuals infected during the early phases of the pandemic, when the original variant and the B.1.1.7 (Alpha) variant predominated, reported more cognitive issues than those infected during later stages. It's important to acknowledge certain limitations of the study: firstly, the history of SARS-CoV-2 infection was based on self-reporting, and there was no standardized assessment of symptom duration. Additionally, while the study suggested infection during prevalent variant phases correspond to the variant of the pathogen, there was no confirmation through actual testing to identify the specific variant of SARS-CoV-2 affecting the patient.
The research involved over 100,000 participants residing in England who had contracted the SARS-CoV-2 virus between August and December of 2022. The determination of infection status relied on various methods, including PCR testing, lateral flow immunoassays, or self-reporting by the individuals. Cognitive function was evaluated through an online computerized assessment, encompassing tests for immediate memory, mental manipulation, spatial memory, and verbal reasoning, among others. Findings indicated minimal differences in cognitive function among individuals whose symptoms resolved within less than 4 months, those whose symptoms persisted for 12 months, and those who had not been infected with SARS-CoV-2. Notably, individuals experiencing prolonged symptoms beyond 12 months exhibited the most significant decline in cognition. Moreover, the severity of the infection was found to impact cognitive ability, with hospitalized patients displaying poorer performance compared to those treated at home. Interestingly, individuals infected during the early phases of the pandemic, when the original variant and the B.1.1.7 (Alpha) variant predominated, reported more cognitive issues than those infected during later stages. It's important to acknowledge certain limitations of the study: firstly, the history of SARS-CoV-2 infection was based on self-reporting, and there was no standardized assessment of symptom duration. Additionally, while the study suggested infection during prevalent variant phases correspond to the variant of the pathogen, there was no confirmation through actual testing to identify the specific variant of SARS-CoV-2 affecting the patient.