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Clinical validation and accuracy assessment of the Capsule Endoscopy-Crohn's Disease index (CE-CD)
José Vicente Arcos-Machancoses1, Akshay Kapoor2, Dominique Schluckebier2
1Department of Paediatric Gastroenterology, Hepatology and Nutrition, Hospital Clínic Universitari de València, València, Spain.
Insights
The new Capsule Endoscopy-Crohn's Disease index (CE-CD) accurately measures small bowel inflammation in pediatric Crohn's disease (CD). It predicts treatment escalation and shows strong agreement between observers.
Area of Science:
- Pediatric Gastroenterology
- Inflammatory Bowel Disease Research
- Diagnostic Tool Development
Background:
- Crohn's disease (CD) in children requires accurate assessment of small bowel (SB) inflammation.
- Existing capsule endoscopy (CE) scoring systems have limitations in predicting clinical outcomes.
- A novel index, CE-CD, has been proposed to improve SB inflammation assessment.
Purpose of the Study:
- To evaluate the precision and accuracy of the CE-CD index.
- To compare CE-CD against established CE scoring methods.
- To determine CE-CD's ability to predict adverse clinical outcomes in pediatric CD.
Main Methods:
- Retrospective analysis of pediatric CD patients undergoing CE with ≥1-year follow-up.
- Independent scoring of CE studies by two pediatric gastroenterologists using CE-CD and other indices.
- Statistical analysis including linear regression, ROC curves, survival analysis, and Cox regression.
- Assessment of interobserver agreement for CE-CD.
Main Results:
- CE-CD strongly correlated with Lewis score (ρ=0.947) and CECDAI (ρ=0.982).
- Both CE-CD and CECDAI predicted treatment escalation (p<0.01).
- A CE-CD score ≥9 indicated moderate-to-severe SB inflammation, predicting treatment escalation (HR 2.6) with 48.4% sensitivity and 89.3% specificity.
- No score predicted hospital admission, surgery, or relapse.
- Perfect interobserver agreement (kappa 100%) was observed for CE-CD.
Conclusions:
- CE-CD is a reliable tool for documenting SB inflammation in pediatric CD.
- CE-CD demonstrates strong correlation with existing scores.
- CE-CD shows superior prediction of treatment escalation compared to other indices.
- The index exhibits excellent interobserver agreement, facilitating consistent clinical application.
Objectives:
To compare the recently proposed Capsule Endoscopy-Crohn's Disease index (CE-CD) to pre-existing capsule endoscopy (CE) scores, to measure its precision and accuracy to predict adverse clinical outcomes in children with Crohn's disease (CD).
Methods:
Children with CD who underwent CE at diagnosis and had, at least, 1-year follow-up postprocedure were selected. Capsule study was viewed and the different indices were independently scored by two trained paediatric gastroenterologists. The relationship between pre-existing scores and CE-CD was assessed by linear regression analysis. Clinical outcomes prediction assessment was based on receiver operating characteristics curves, survival analysis and Cox regression. Finally, interobserver agreement was measured.
Results:
Fifty-nine patients were finally included. CE-CD showed a strong positive correlation with the Lewis score (ρ = 0.947) and the Capsule Endoscopy Crohn's Disease Activity Index (CECDAI) (ρ = 0.982). Both CE-CD and CECDAI were significant predictors of treatment escalation (hazard ratio 1.07 and 1.09, respectively, with both p-values < 0.01). However, no score predicted risk of hospital admission, surgery or clinical/endoscopic relapse. The presence of moderate-to-severe small bowel (SB) inflammation, defined as a score of ≥9 on CE-CD, provided a hazard ratio of treatment escalation of 2.6 (95% confidence interval: 1.3-5.3). This cut-off provided the optimal sensitivity/specificity pair: 48.4%/89.3%. No interobserver misclassification among inflammation categories given by CE-CD were observed (kappa 100%).
Conclusion:
CE-CD is a useful tool to document SB inflammation in children with CD. It correlates strongly with classical scores, can better predict need for treatment escalation and shows good interobserver agreement.
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