A Multicentre Study of the Clinical and Epidemiological Profile of Inflammatory Bowel Disease in Northeast Brazil.

ABSTRACT

Purpose: Ulcerative colitis (UC) and Crohn's disease (CD) are inflammatory bowel diseases (IBDs) with multifactorial causes. They are becoming more prevalent in developing countries such as Brazil; however, relevant studies in poorer regions of the country are limited. Here, we report the clinical-epidemiological profile of patients with IBD treated at reference centers in three states of Northeast Brazil. Patients and Methods: This was a prospective cohort study involving patients at referral outpatient clinics for IBD from January 2020 through December 2021. Results: Of 571 patients with IBD, 355 (62%) had UC, and 216 (38%) had CD. The patients were predominantly women (355, 62%) for both UC and CD. Extensive colitis was the pattern present in 39% of the UC cases. For CD, ileocolonic disease was the predominant manifestation (38%), with 67% of cases showing penetrating and/or stenosing behavior. The majority of patients were diagnosed between the ages of 17 and 40, corresponding to 60.2% in CD and 52.7% in UC. The median time between symptom onset and diagnosis was 12 months for CD and 8 months for UC (p=0.042). Joint involvement was the most frequent extraintestinal manifestation, with arthralgia and arthritis present in 41.9% and 18.6% of the patients, respectively. Biological therapy was prescribed to 73% of CD patients and 26% of UC patients. A progressive increase in new cases was observed in every 5-year interval over the last five decades, with 58.6% being diagnosed in the last 10 years. Conclusion: More extensive disease behavior patterns predominated in UC, while forms associated with complications were prevalent in CD. A prolonged time to diagnosis may have contributed to these findings. A progressive increase in IBD incidence was observed and may be related to greater urbanization and better access to specialized outpatient clinics, resulting in improvements in diagnosis.