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An increase in giant cell arteritis cases associated with peaks in COVID-19 prevalence

2021-06-18
(Press-News.org) Ben Mulhearn and colleagues estimated the incidence of GCA seen during the COVID-19 pandemic and compared it to data from 2019, before the pandemic hit. The two distinct peaks of COVID-19 reflected by UK hospital admissions of COVID-19-positive patients allowed the authors to investigate the relationship in time between COVID-19 and GCA incidence.

At the Royal National Hospital for Rheumatic Diseases in Bath, UK, there were 61 probable or definite GCA diagnoses made in 2020 compared to 28 in 2019- representing an excess of 33 cases in 2020, or an increase of 118%.Taking into account the fact that41% of the hospital's catchment population is over the age of 50, this equates to an annual incidence rate of 13.7 per 100,000 in 2019 and 29.8 per 100,000 in 2020. The previously estimated regional incidence rate for South West of the UK was 21.6 per 100,000.

The significantly increased incidence of GCA may be the result of widespread infection in the local population,withSARS-CoV-2 as a driving factor. Possible mechanisms include, but are not limited to, endothelial disruption by the virus, immune system priming towards T helper cell type 1 cellular immunity, and activation of the monocyte-macrophage system. More work is underway to assess the causal relationship between the two diseases, and it may be important to monitor the number of referrals for GCA as the pandemic continues.

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[Press-News.org] An increase in giant cell arteritis cases associated with peaks in COVID-19 prevalence