Incidence, Predictors, and Outcomes of Acute Pericarditis in Patients with Inflammatory Bowel Disease: A 10-Year Nationwide Analysis.

Background: Inflammatory bowel disease (IBD) is a chronic condition characterized primarily by inflammation of the gastrointestinal tract. Pericarditis is a rare but important extraintestinal manifestation of IBD that is poorly understood yet is associated with significant morbidity. The objectives of this study were to identify the factors associated with pericarditis in IBD and associated complications. Methods: Hospitalized adult patients (aged ≥ 18 years) with a diagnosis of acute pericarditis in the IBD cohort, 2011-2020, were identified from the National Inpatient Sample using codes from the International Classification of Diseases (revision 9 or 10). Multivariable logistic regression was performed to identify clinical factors associated with pericarditis among IBD patients and in-hospital complications. Results: During the period 2011-2020, among 3,236,747 IBD patients, 9113 (0.28%) had pericarditis, with a mean patient age of 54.08 ± 0.48 years, and 53.1% females. Patients with IBD and coexisting diagnoses of systemic lupus erythematosus (odds ratio [OR] 1.49, 95% confidence interval [CI] 1.03-2.15, Conclusions: Pericarditis is an uncommon but important manifestation of IBD. The presence of a concomitant autoimmune condition led to a higher likelihood of developing pericarditis among IBD patients, and IBD patients who develop pericarditis had a higher incidence of inpatient mortality compared to IBD patients without pericarditis. Providers should be aware of the connection between IBD and pericarditis to identify individuals at risk of adverse complications.