P1122 Comorbidities Associated with Pediatric Onset Inflammatory Bowel Diseases: A Population-Based Study

Abstract

Abstract Background Inflammatory bowel disease (IBD) can be associated with various disorders, including dermatological, rheumatological, or psychiatric conditions. However, little is known about the incidence of these co-morbidities in paediatric-onset IBD at the population-based level. Methods All patients diagnosed with Crohn's disease (CD) or ulcerative colitis (UC) before the age of 17 between 1988 and 2011, and included in the EPIMAD population-based registry, were followed retrospectively until 2013. In this population, we collected information on comorbidities present at diagnosis, as well as events related to the development of a new chronic condition, hospitalization, or an infectious event of interest (as pneumopathy, meningitis, or pyelonephritis) reported in the medical records during the follow-up period. Results A total of 1,344 patients were included, comprising 1,007 (74.9%) with CD and 337 (25.1%) with UC. The median age at diagnosis was 14.3 years (IQR [11.7; 16.0]). During a median follow-up of 8.3 years ([4.3-13.9]), 361 (26.9%) patients exhibited at least one comorbidity. At diagnosis, 9.4% (95% CI [7.8% - 11.0%]) of patients had at least one comorbidity. The cumulative incidence of comorbidity was 13% (95% CI [11% - 14%]) at 1 year after diagnosis and 20% (95% CI [17% - 22%]) at 5 years. No association was found between the risk of comorbidity and the clinical characteristics at IBD diagnosis. However, the cumulative incidence of comorbidity was higher in the diagnosis period 2001-2011 than in the period 1988-1993 (HR=1.7 [1.2-2.2]; p<0.001). The most frequent comorbidities were infectious (5.6%), dermatological (5.5%), and pulmonary (5.3%) (Figure 1). The most common infectious events included bacteraemia, digestive tract infection with Clostridioides difficile, and viral infection with Herpesviridae or parvovirus B19, with a cumulative incidence during follow-up of 1.2%, 1.0%, and 0.9%, respectively. During follow-up, viral infections with HBV, HCV, or HIV were observed in 0.2% of patients, and pneumopathy was diagnosed in 0.7% of patients. Eczema and asthma were the predominant dermatological and pulmonary comorbidities, affecting 2.6% and 5.1% of patients, respectively. Conclusion In this paediatric-onset IBD population-based cohort, the most common comorbidities were infectious, dermatological, and pulmonary. Bacteraemia emerged as the most prevalent severe infectious event during follow-up, affecting 1.2% of patients.