Insight into the Epidemiology of the Adult-onset Systemic Autoimmune Rheumatic Diseases in Egypt: A Descriptive Study of 8690 Patients.

Background/objective: Although systemic autoimmune rheumatic diseases (SARDs) seem to be ubiquitous, Africa and the Middle East seem to be a remarkable exception with scarcity of data compared with the developed countries. Furthermore, most of the studies addressed a particular disease. This work aimed to shed light on the relative frequency and epidemiology of the different adult-onset SARDs in Egypt.

Methods: This is a retrospective hospital-based study including six university hospitals providing free health care services: Cairo, Alexandria, Tanta, Suez Canal, Beni-Suef and Assiut University Hospitals. All available files for patients attending the outpatient clinics or admitted to the inpatient departments between January 2000 and December 2021 were retrospectively reviewed. Data about the patient's diagnosis, gender, age at disease onset, year of disease onset and residence were collected.

Results: The study included 8690 patients. Rheumatoid arthritis (RA), systemic lupus erythematosus (SLE), Behçet's disease (BD) and spondyloarthropathies (SPA) represented the main SARDs in Egypt. They mainly affect young patients below the age of 40 years. RA and SLE mainly affect females; males are mainly affected by axial SPA and BD. There is an increasing incidence of SARDs during the study period.

Conclusion: The study revealed the high burden of SARDs in Egypt, helping better allocation of economic resources for the management of diseases of the highest prevalence and those affecting the young reproductive age groups. Increased public and medical staff awareness about SARDs is recommended to help early referral of patients to rheumatologists and, hence, better estimation of their epidemiology.