Abstract
Abstract Background Rare but severe adverse events (AEs) can occur in pediatric inflammatory bowel disease (PIBD) due to ongoing inflammation, secondary to immunosuppressive drugs or as coincidental finding. These events can lead to significant disability or even death. Limited prospective research hampers the understanding of the incidences, risk factors, and outcomes associated with these events. Methods As part of the ongoing international PIBD-SETQuality Safety Registry, participating pediatric gastroenterologists prospectively reported the occurrence of any of 10 listed rare and severe AEs in their PIBD patient population (<19 years) via monthly electronic surveys since October 2016. Additionally, physicians could report ‘other rare and severe AEs’. Participants received an annual denominator survey, to report the number of PIBD patients under their care. Incidence rates (IRs) were calculated for each AE using Poisson regression models and were compared between countries. Upon reporting AEs, participants received specific follow-up forms to collect patient and IBD characteristics, as well as complication details (diagnosis, risk factors, management, outcome). Results Over a 77-month study period (October 2016 to April 2023), 222 pediatric gastroenterologists from 167 centers across 36 countries actively contributed to the registry, completing 7,975 monthly surveys with a median response rate of 86% [IQR 82%-88%]. On average, participants contributed for 53 months [IQR 25-72]. They covered 30,192 PIBD patients, with 114,528 patient-years (PY) of follow-up. In total, 285 listed complications were reported, alongside 117 uncategorized ‘other rare and severe AEs’. The highest IRs (95%CI) per 10,000 PY were found for VTE (IR 5.50 [2.74-4.99]), renal failure (IR 3.67 [2.67-4.89]), opportunistic infections (IR 2.88 [2.01-3.98]), and cancer (IR 2.71 [1.86-3.77]) (Figure 1). The lowest IRs (95%CI) per 10,000 PY were found for liver failure (IR 0.35 [0.11-0.81]) and HLH (IR 0.52 [0.21-1.06]). Combined IRs of the listed AEs did not differ among the five countries with the highest contribution of PY (p=0.18). Conclusion Through international collaboration among a large network of PIBD specialists, the Safety Registry has confirmed the increased incidence of several AEs in PIBD, including VTE, cancer and renal failure. Clinical characterization of these events may lead to a better understanding of their underlying etiologies and outcomes. This improves patient care by providing guidance for management development, facilitating well informed clinical decision making and may lead to prevention of these rare and severe events.
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