Subtypes of Venous Thromboembolism in Inflammatory Bowel Disease: A Nationwide Assessment.

Background:Data detailing the risk of Venous Thromboembolism (VTE) subtypes among individuals with Inflammatory bowel disease (IBD) remain limited.Aims: We looked to assess the odds of VTE subtypes among hospitalized individuals with IBD as compared to those without IBD. Materials & Methods:Using the Nationwide Inpatient Sample database, we applied a multivariable regression analysis to compare the odds of primary VTE-related hospitalizations among individuals with and without IBD from 2016 to 2020, including deep venous thrombosis (DVT), pulmonary embolism (PE), portal vein thrombosis (PVT), Budd Chiari syndrome (BCS), renal vein thrombosis (RVT), and cerebral venous sinus thrombosis (CVST). Results:Overall, there were 15,565 primary VTE-related hospitalizations among individuals with IBD, as compared to 1,449,164 among individuals without IBD. Having IBD increased the odds for DVT (aOR = 1.34, 95%CI: 1.25-1.43), PVT (aOR = 3.16, 95%CI: 2.65-3.76), and CVST (aOR=1.45, 95%CI: 1.05-2.00), without significant increase in the odds of a PE, BCS, or RVT. Further, individuals with ulcerative colitis (UC) were at a higher risk for the majority of VTE-subtypes as compared to those with Crohn's disease (CD). Among individuals with a VTE-related hospitalization, the presence of IBD was not associated with increased mortality (aOR = 0.77, 95%CI: 0.40-1.50), but was associated with an increased length of stay (CD - 4.8 days, UC - 5.3 days, without IBD - 4.3 days, p<0.01). Conclusions:Clinicians should retain a high index of suspicion when evaluating VTE-related symptoms among individuals with IBD, as the presence of IBD confers a higher risk of DVT, PVT and CVST related-hospitalizations, and longer stays as compared to individuals without IBD.