A188 NATURAL HISTORY OF PERIANAL FISTULAS IN PATIENTS WITH ILEAL POUCH ANAL ANASTOMOSIS
Bibliographic record
Abstract
Abstract Background The natural history of perianal fistulas (PAF) in patients with ileal pouch-anal anastomosis (IPAA) remains poorly understood. Perianal fistulas can significantly impact the quality of life and clinical outcomes in patients who have undergone IPAA. To date, there is limited data available on the long-term progression, treatment responses, and overall outcomes of PAF in this unique patient population. Aims The primary aim of this study is to report the clinical outcomes of PAF in patients with IPAA. Methods We performed a retrospective, observation cohort study between 2000 and 2024. We included adults (>17 years) with an IPAA who developed a perianal fistula and a minimum of 1 year follow-up after PAF diagnosis. PAF disease activity was categorized on an annual basis according to the following disease activity patterns: remission, minimally active, relapsing-remitting, and chronic persistent. We also determined medication utilization, medication effectiveness and major adverse fistula outcomes (MAFO): a composite of hospitalization, surgical drainage of PAF and fecal diversion. Results A total of 29 patients with an IPAA and PAF were identified: mean (SD) age 49.3 (13.2); 19 (65.5%) female, and 17 (63.0%) with complex fistulas radiologically at the time of diagnosis. After a mean (SD) follow-up of 9.7 years (7.4), 7 (25.0%) patients required fecal diversion, and 2 (7.1%) patients underwent pouch excision. Annual PAF disease patterns are reported in Figure 1. At the last date of follow-up, 26 (92.9%) patients achieved fistula remission. A total of 16 (55.2%) patients underwent treatment with an advanced therapy: 14 (87.5%) anti-TNF and 2 (12.5%) Risankizumab. After initiating a first advanced therapy, 10 (62.5%) patients achieved fistula remission at 12 months. Furthermore, 3 (18.8%) patients developed a MAFO after initiating their first advanced therapy: 3 (18.8%) underwent surgical drainage, 1 (6.3%) was hospitalized, and 1 (6.3%) underwent fecal diversion for PAF. Conclusions This study demonstrated that the majority of patients with PAF in the setting of IPAA achieved fistula remission clinically, particularly after treatment with advanced therapies. Despite the high remission rates, a substantial subset of patients still required fecal diversion and pouch excision. Annual perianal fistula disease patterns Funding Agencies None
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".