Pre-stenotic Inflammation Following Endoscopic Balloon Dilatation in Crohn's Disease: A Prospective Study

Study Overview
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Brief Summary
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As a consequence of chronic relapsing inflammation in Crohn's disease (CD), progressive bowel damage and scarring occurs in affected regions of intestine. This damage often leads to narrowing, or stricturing of the bowel lumen, and even complete bowel obstruction. Stricturing CD is thought to be a major contributor to penetrating complications including abscesses and fistulae. Depending on the severity and clinical significance of fixed strictures, treatment options include either endoscopic balloon dilatation (EBD), or surgery with either resection or stricturoplasty recommended on a case-by-case basis. EBD has been shown to be a safe alternative to surgery in management of CD strictures. While the short- and medium-term clinical outcomes of EBD have been well described, less well studied is the impact of relieving Crohn's strictures on the inflammatory load proximal to the stricture. The restricted flow of fecal contents through a stricture creates a region of relative stasis in the bowel loops immediately proximal to the stricture, appreciated at times by pre-stenotic dilatation on cross-sectional imaging. This stasis fosters localized bacterial overgrowth and worsening dysbiosis in these bowel loops. The investigators hypothesize that improvement of fecal flow by way of successful balloon dilatation of a CD stricture, could independently reduce the inflammatory burden, not only in the stenotic segment but also in the proximal loop of bowel.

Detailed Description
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This prospective, observational study will include both pediatric and adult patients with stricturing CD on stable therapy who are planned to undergo EBD for management of a Crohn's stricture. Included patients are those in whom the treating physician is planning a colonoscopic EBD for a CD stricture. Patients will be followed with imaging, clinical assessment, serologic testing, stool microbiome and endoscopic assessment at time of EBD, and post-EBD. EBD will be performed to a target dilatation size of 18-20mm. If the stricture is deemed too narrow to allow dilatation to target size in a single session, graduated dilatations at a number of sessions can be undertaken at the treating clinician discretion. Time-point of week 0 will be defined as achievement of dilatation target size. Clinical assessment, blood and stool for calprotectin and microbiome, and focused bowel US to be performed within a 4 week period prior to EBD. Previous imaging (US/MRE/CTE) from 2-4 months prior to EBD, where performed, will also be assessed. In the absence of any contra-indication, repeat colonoscopy will be performed at week 12 (±2 weeks) to assess stricture size and assess extent of mucosal inflammation at the stricture site and the pre-stenotic region. Follow-up clinical review with repeat blood tests, stool for calprotectin and microbiome and focused bowel US will also be performed at week 12 (±2 weeks). Endoscopic images from pre-stenotic bowel loop and bowel US from week 0 and week 12 will be centrally read by two central readers blinded to the patient and stage. An average of pre-stenotic region SES-CD score and US-derived outcome measures from both readers will be recorded. Where available, imaging from 2-4 months pre-EBD, either US, MRE or CTE, will be assessed by the same central readers. Patients in whom successful balloon dilatation was achieved (see definitions below) will be included in the primary analysis. Patients in whom dilatation was attempted but was not successful (see below) will also be followed and will be analyzed as control group. Patient's medications are to remain unchanged throughout the follow-up period, including biologic type or dose, or addition of corticosteroids/nutritional therapy, unless the treating physician decides otherwise on clinical grounds, in which case the patient will be defaulted from analysis. Patients on corticosteroid or nutritional therapy at recruitment can continue to wean therapy as per clinician directive.

Official Title
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Pre-stenotic Inflammation Following Endoscopic Balloon Dilatation in Crohn's Disease: A Prospective Study

Conditions
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Crohn Disease

Participation Criteria
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Eligibility Criteria
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Inclusion criteria: Patients diagnosed with CD as per most recent international guidelines. Presence of strictured bowel (jejunal, ileal, colonic or ileocecal valve), either primary or anastomotic in nature, with prestenotic dilatation >2.5cm loop diameter as demonstrated on cross-sectional imaging (Magentic Resonance Enteroclysis (MRE), Computerized Tomography Enteroclysis (CTE) or ultrasound (US)) Evidence of pre-stenotic inflammation defined as wall thickness ≥5mm on cross-sectional imaging, or pre-stenotic SES-CD ≥3. Planned EBD as per clinical management. Unchanged CD medications - 3 months no change in therapy including immunomodulators (thiopurines or methotrexate), biological therapies, corticosteroid therapy, or nutritional therapy with exclusive enteral nutrition (EEN) or partial enteral nutrition (PEN). No planned treatment changes or additions over the 3 months following recruitment. The treating physician can change treatment at any time should the clinical need arise however the patient will be excluded from primary analysis Exclusion criteria: Any patient deemed not appropriate for EBD by treating physician due to stricture- specific, or patient-specific reasons will not be included Change in therapy (dose or type) in the 3 months prior to planned EBD
Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Endoscopic response | Decrease in SES-CD in the pre-stenotic region of ≥ 3 at 12 weeks compared to week 0 | 12 weeks compared to week 0 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Endoscopic healing | Post-endoscopic balloon dilatation (EBD) mucosal healing in pre-stenotic region defined as regional SES-CD ≤ 1 | week 12 | 
| Wall thickness | ≥30% reduced intestinal wall thickness in pre-stenotic loop of bowel 12 weeks following successful EBD | week 12 compared to week 0 | 
| Limberg score US | Decrease in Limberg grade of hyperemia in pre-stenotic region of ≥ 2 | week 12 compared to week 0 | 
| Luminal diameter | >50% reduction of ratio of maximal upstream luminal diameter to minimal downstream luminal diameter | week 12 compared to week 0 | 
| Inflammed length | >50% reduced length of involved pre-stenotic inflamed region | week 12 compared to week 0 | 
| Obstructive score reduction | CDOS ≤ 1 at week 12 | week 12 | 
| Clinical remission | Clinical remission as measured by physician global assessment (PGA). 0-100 mm scale 0 being full remission (lower score better outcome) | week 12 | 
| Stool calprotectin | >50% reduction in stool calprotectin at week 12 | week 12 compared to week 0 | 
| No treatment escalation | No treatment escalation following EBD | week 12 | 
| Comparison of imaging and calprotectin | Comparison of outcome measures from cross-sectional imaging and stool calprotectin at week 12 between patients with successful EBD vs those with unsuccessful EBD control. | week 12 | 
| Clinical remission | Clinical remission as measured by Crohn's Disease Activity Index (CDAI )< 150 at week 12.Lower score better outcome | week 12 | 
| Clinical remission | Clinical remission as measured by wPCDAI < 12.5 at week 12 | week 12 | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Crohn, Stricture, Endoscopic Balloon Dilatation