Severe COVID-19 in Patients with Immune-Mediated Rheumatic Disorders: A Case-Control Study.

Purpose: To assess the impact of severe COVID-19 in patients with immune-mediated rheumatic diseases (im-RD) and compare their morbidity, mortality, hospitalization issues, post-COVID-19 sequelae, and the financial burden of COVID-19 with those of patients without im-RD.

Patients and methods: We conducted a retrospective case-control study that included 132 consecutive patients with im-RD who visited the Rheumatology Department of a public hospital in the Emirate of Dubai and were hospitalized for COVID-19 infection between March 1st, 2020, and December 31st, 2021, (cases). We included 264 and 132 age- and sex-matched patients without im-RD in matched-I and matched-II control groups, respectively. The median age of patients and controls was 48.5 years, and 74.2% were female. Patients with im-RD were paired with an unforced nearest neighbor match using a caliper width of 0.2 standard deviations of the matched-II control group's propensity score. We compared the relative risk of death, disease progress, use of medical resources, and financial impact of COVID-19 between patients and controls.

Results: Patients with im-RD had higher mortality rates than the matched-I (odds ratio, OR: 11.2, p < 0.000) and matched-II (OR: 16.8, p < 0.006) control groups. The overall complication rate was also significantly higher in patients with im-RD than in matched-I (OR = 2.9, p < 0.000) and matched-II (OR = 2.8, P < 0.0001) control groups. Lastly, patients with im-RD required more frequent visits to the clinic, a longer recovery time following hospital discharge, and increased healthcare costs compared to the control groups.

Conclusion: COVID-19 infection in patients with im-RD is associated with increased morbidity and mortality, exerting a significant burden on the healthcare system.