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OP0247 (2022)
RISK FACTORS FOR SEVERE COVID-19 OUTCOMES: A STUDY OF IMMUNE-MEDIATED INFLAMMATORY DISEASES, THERAPIES AND COMORBIDITIES IN A LARGE US HEALTHCARE SYSTEM
P. J. Mease1, Q. Wei2, M. Chiorean3, L. Iles-Shih3, J. Hadlock2
1Swedish Medical Center/Providence St. Joseph Health, Rheumatology, Seattle, United States of America
2Institute for Systems Biology, Hadlock Lab, Seattle, United States of America
3Swedish Medical Center, Gastroenterology, Seattle, United States of America

Background: The risk of acquiring COVID-19, and the severity of illness if acquired, in the context of immune-mediated inflammatory diseases (IMIDs) and their therapy, remains incompletely understood. Reported infection rates and outcomes have varied depending on the IMIDs being studied, the nature and size of the study population, and the presence or absence of appropriate control populations. Having more reliable analysis on larger populations is essential for current and future pandemics.


Objectives: Health records from one of the largest health systems in the US are analyzed to determine whether specific IMIDs, including common rheumatologic conditions and specific immunomodulatory drugs, are associated with certain COVID-19 outcomes, using multivariate models that include common chronic comorbidities.


Methods: Patients (pts) with and without IMIDs who were tested for SARS-CoV-2 antigen (n=1,101,431) were identified from the EHR from Providence St. Joseph Health, which serves much of the western US. Immunomodulatory drug therapy was defined as use within three months prior to the first test. Multivariate logistic regression (LR) was applied with machine learning metrics (feature importance, p-value) reported on an 80% training set and AUROC reported on 20% test set.


Results: Rates for positive COVID-19 tests, invasive mechanical ventilation (IMV) and mortality were not greater in the IMID than non-IMID population, whilst hospitalization was similar ( Table 1 ). Importance and statistical significance of selected factors are shown in ( Figure 1 ). The most important risk factors for hospitalization were age and heart failure. Heart failure was the most important risk factor for IMV, and age for increased mortality. Diabetes showed weak associations with these three outcomes. Spondyloarthritis was weakly associated with decreased hospitalization, IMV, and death. The use of conventional synthetic disease-modifying antirheumatic drugs (csDMARDS) and corticosteroids (CS) showed a weak association with hospitalization, and rituximab (RTX) showed a weak association with increased mortality. Limitations include lack of vaccination status and IMID disease severity/flare status. Testing was not universal.

COVID-19 test results, hospitalization, invasive mechanical ventilation, and mortality

Tested for COVID COVID+ Hospitalized n , % of COVID+ IMV n , % of COVID+ Mortality % of COVID+
n (% ) n , % of tested n , % of COVID+
All pts 1,101,431 (100%) 128,962 (11.7%) 19,704 (15.3%) 1,001 (0.8%) 2,232 (1.7%)
Pts without selected IMIDs 1,049,007 (95.3%) 123,943 (11.8%) 18,729 (15.1%) 959 (0.8%) 2,165 (1.7%)
Pts with selected rheumatologic IMIDs 28,411 (2.5%) 2,974 (10.5%) 578 (19.4%) 27 (0.9%) 51 (1.7%)
Pts with other selected IMIDs 24,013 (2.2%) 2,045 (8.5%) 397 (19.4%) 15 (0.7%) 16 (0.8%)

Selected rheumatologic IMIDs = RA, SpA, PsA, SLE, PsO, SSc; Other selected IMIDs = IBD, MS.

Odds ratio (OR) for selected risk factors for COVID-19 positive test, hospitalization, IMV, and mortality


Conclusion: This analysis of COVID+ patients (n=1,101,431) from a large US health care system analyzes outcomes of patients with and without IMIDs; the majority were rheumatologic IMIDs. Patients with IMIDs had a similar rate of hospitalization, IMV, and death as those without IMIDs. The strongest associations with COVID-19 severity included heart failure and age. Spondyloarthritis was weakly associated with favorable outcomes whilst other conditions, including rheumatologic, were not worse than those of non-IMID patients. csDMARDs and corticosteroids were weakly associated with hospitalization and RTX with increased mortality. Other therapies were not associated with severe adverse outcomes.


Acknowledgements: Philip Mease and Qi Wei contributed equally and share first authorship. Swedish Medical Foundation and Pfizer investigator-initiated study grant.


Disclosure of Interests: Philip J Mease Speakers bureau: AbbVie, Amgen, Eli Lilly, Janssen, Novartis, Pfizer, UCB, Consultant of: AbbVie, Aclaris, Amgen, Boehringer Ingelheim, Bristol Myers Squibb, Eli Lilly, Galapagos, Gilead, GlaxoSmithKline, Inmagene, Janssen, Novartis, Pfizer, Sun Pharma, UCB, Grant/research support from: AbbVie, Amgen, Bristol Myers Squibb, Eli Lilly, Galapagos, Gilead, Janssen, Novartis, Pfizer, Sun Pharma, Swedish Medical Foundation, UCB, Qi Wei Grant/research support from: Pfizer, Swedish Medical Foundation, Michael Chiorean Speakers bureau: Pfizer, BMS, Takeda, AbbVie, Janssen, Medtronic, Consultant of: Pfizer, Lilly, Janssen, Arena, Medtronic, BMS, AbbVie, Grant/research support from: Takeda, Pfizer, Novartis, Swedish Medical Foundation, Lulu Iles-Shih Grant/research support from: Pfizer, Swedish Medical Foundation, Jennifer Hadlock Grant/research support from: Pfizer, Swedish Medical Foundation

Citation: , volume 81, supplement 1, year 2022, page 161
Session: Outcome of COVID-19 in Rheumatic Diseases (Oral Presentations)