The Disease Severity Index for Inflammatory Bowel Disease Is a Valid Instrument that Predicts Complicated Disease

Cumulative Impact of Clinical Disease Activity, Biochemical Activity and Psychological Health on the Natural History of Inflammatory Bowel Disease During 8 Years of Longitudinal Follow-Up

BACKGROUND

Common mental disorders, including anxiety and depression, are prevalent in patients with inflammatory bowel disease (IBD) and may be associated with adverse outcomes. However, whether increasing psychological co-morbidity, in combination with disease activity, exerts a cumulative effect on prognosis is uncertain.

AIMS

To assess this in a longitudinal follow-up study.

METHODS

We collected baseline demographic and IBD-related information, clinical activity using disease activity scores and biochemical activity using calprotectin. Patients were grouped according to the presence or absence of disease activity. Patients in remission or with active disease were subgrouped according to the presence or absence of symptoms of a common mental disorder at baseline. We recorded the occurrence of adverse outcomes over 8.1 years, comparing their occurrence across subgroups using Cox regression.

RESULTS

Among 717 participants with clinical activity data and 187 with clinical and biochemical activity data, rates of adverse outcomes increased with both disease activity and increasing psychological co-morbidity. Rates of flare or glucocorticosteroid prescription, escalation or death were higher with clinical activity (HR 2.89; 95% CI 1.68-4.93 and 2.52; 95% CI 1.55-4.10 and 6.97; 95% CI 2.43-20.0, respectively) or clinical and biochemical activity (HR 7.26; 95% CI 2.86-18.5, 3.62; 95% CI 1.59-8.25 and 57.3; 95% CI 7.58-433, respectively) and two common mental disorders. Rates of hospitalisation (HR 6.20; 95% CI 1.88-20.4) or hospitalisation and/or intestinal resection (HR 7.46; 95% CI 2.41-23.2) were higher with clinical and biochemical activity and two common mental disorders.

CONCLUSION

Psychological co-morbidity and active disease have a cumulative adverse impact on IBD prognosis.

Integrating the Patient Perspective to Validate a Measure of Disease Severity in Inflammatory Bowel Disease: Online Survey of Patients and Their Physicians

BACKGROUND

The patient perspective is essential for assessing disease severity, but it is not always adequately considered. We describe how a comprehensive clinical disease severity index (DSI) for inflammatory bowel disease (IBD) correlates with patient global self-assessment (PGSA).

METHODS

In an individually linked parallel online survey, physicians provided the DSI, and patients provided self-assessed severity using a global question and visual analog scale (0-100) (PGSA). Mean DSI values by PGSA were calculated with 95% confidence intervals. Pearson correlation (r) and the intraclass correlation coefficient were calculated for PGSA vs DSI. Positive predictive values for identifying severe disease with PGSA categories as a reference were based on a threshold >22 points.

RESULTS

The primary analysis included 89 pairs (46 Crohn's disease [CD], 43 ulcerative colitis [UC]) with strict criteria and 147 pairs when less stringent. Common reasons for exclusion were missing values for albumin or colonoscopy. Mean DSI values showed no clear trend with increasing PGSA in CD but good discrimination between moderate, severe, and very severe PGSA in UC. For PGSA on the visual analog scale, r was 0.54 for CD and 0.59 for UC (difference in means: CD 27.7, UC 13.8; intraclass correlation coefficient: CD 0.48, UC 0.58). A high DSI predicted severe disease in 76.2% of CD and 65.2% of UC.

CONCLUSIONS

The DSI showed good discrimination for patient-reported disease severity in UC but performed unsatisfactorily in CD. Correlations were moderate. Further refinement of the DSI is suggested to better reflect the patient perspective.

Review article: Measuring disease severity in inflammatory bowel disease - Beyond treat to target

BACKGROUND

Inflammatory bowel disease (IBD) follows a heterogenous disease course and predicting a patient's prognosis is challenging. There is a wide burden of illness in IBD and existing tools measure disease activity at a snapshot in time. Comprehensive assessment of IBD severity should incorporate disease activity, prognosis, and the impacts of disease on a patient. This review investigates the concept of disease severity in adults with IBD to highlight key components contributing to this.

METHODS

To perform this narrative review, a Medline search was conducted for full-text articles available at 1st March 2024 using search terms which encompassed disease activity assessment, disease severity, prognosis, natural history of Crohn's disease (CD) and ulcerative colitis (UC), and the burden of IBD.

RESULTS

Current methods of disease assessment in IBD have evolved from a focus on the burden of symptoms to one that includes inflammatory targets, genetic, serological, and proteomic profiles, and assessments of quality-of-life (QoL), disability, and psychosocial health. Longitudinal studies of IBD suggest that the burden of illness is driven by disease phenotype, clinical markers of complicated disease course (previous intestinal resection, corticosteroid use, perianal disease in CD, recent hospitalisations in UC), gut inflammation, and the impact of IBD on the patient.

CONCLUSIONS

Disease severity in IBD can be difficult to conceptualise due to the multitude of factors that contribute to IBD outcomes. Measurement of IBD severity may better encapsulate the full burden of illness rather than gut inflammation alone at a single timepoint and may be associated with longitudinal outcomes.

Perianal Crohn's disease: Still more questions than answers

In this editorial we comment on the article by Pacheco et al published in a recent issue of the World Journal of Gastroenterology. We focus specifically on the burden of illness associated with perianal fistulizing Crohn's disease (PFCD) and the diagnostic and therapeutic challenges in the management of this condition. Evolving evidence has shifted the diagnostic framework for PFCD from anatomical classification systems, to one that is more nuanced and patient-focused to drive ongoing decision making. This editorial aims to reflect on these aspects to help clinicians face the challenge of PFCD in day-to-day clinical practice.

Ten-year outcomes of a prospective population-based incidence cohort of inflammatory bowel disease patients from Canterbury, New Zealand

BACKGROUND AND AIM

Inflammatory bowel disease (IBD) is a progressive condition where ongoing inflammation in the gastrointestinal tract can lead to complications such as strictures, and fistulae. The long-term outcomes of newly diagnosed patients under current medical therapy can be used to plan health service provision and guide patients.

METHODS

Prospective population-based data on all incident patients diagnosed with IBD in Canterbury was gathered in 2014 (n = 205). The medical records of these patients were followed for medication use, disease progression, hospitalization, surgery and mortality, in the 10 years since their diagnosis. Survival analysis and cox regression determined characteristics associated with earlier time to these outcomes.

RESULTS

Medical records of 184 IBD patients were able to be retrieved. Immunomodulators were used by 62% and biologics by 35%; hospitalization occurred for 42% and surgery for 15%. Montreal phenotype progression occurred for 21 and 7% of the cohort died. Younger age at diagnosis hazard ratio (HR) 2.1 (95% confidence interval [CI] 1.1-4.0) and Crohn's disease HR 1.7 (95% CI 1.1-2.6) was associated with immunomodulator use. Younger age was also associated with biologic use HR 2.9 (95% CI 1.2-6.9). Male gender was associated with surgery HR 2.8 (95% CI 1.2-6.4). Perianal disease at diagnosis (14.7%) was associated with immunomodulator use HR 2.58 (95% CI 1.44-4.59) and Montreal phenotype progression HR 2.93 (95% CI 1.10-7.77).

CONCLUSION

In the 10 years since diagnosis disease progression and treatment escalation occurred for most of this population-based cohort. Earlier intervention for patients with higher-risk characteristics may improve long-term outcomes reducing the burden on health systems.

Development and investigation of a non-invasive disease severity index for inflammatory bowel disease

INTRODUCTION

The disease severity index (DSI) encapsulates the inflammatory bowel disease (IBD) burden but requires endoscopic investigations. This study developed a non-invasive DSI using faecal calprotectin (DSI-fCal) and faecal myeloperoxidase (DSI-fMPO) instead of colonoscopy.

METHODS

Adults with IBD were recruited prospectively. Baseline biomarker concentrations were used to develop DSI-fCal and DSI-fMPO, and these were correlated with the original DSI, IBD-symptoms, endoscopic activity, and quality-of-life (QoL). Area under the receiver-operating-characteristics curves (AUROC) assessed DSI-fCal/DSI-fMPO as predictors of clinical and biochemical remission at six months (symptom remission and fCal <150 μg/g, respectively), and a complicated IBD-course at 24 months (disease relapse needing escalation of biologicals/immunomodulators/recurrent corticosteroids, IBD-hospitalisations/surgeries). Multivariable logistic regression assessed the utility of DSI-fCal/DSI-fMPO in predicting a complicated IBD-course at 24 months.

RESULTS

In total, 171 patients were included (Crohn's disease=99, female=90, median age=46y (IQR 36-59)). DSI-fCal and DSI-fMPO correlated with the original DSI (r>0.9, p<0.001), endoscopic indices (r=0.45-0.49, p<0.001), IBD-symptoms (r=0.53-0.58, p<0.001) and QoL (r=-0.57-0.58, p<0.001). Baseline DSI-fCal (AUROC=0.79, 95% CI 0.65-0.92) and DSI-fMPO (AUROC=0.80, 95% CI 0.67-0.93) were associated with 6-month clinical and biochemical remission. DSI-fCal (AUROC=0.83, 95% CI 0.77-0.89) and DSI-fMPO (AUROC=0.80, 95% CI 0.73-0.87) performed similarly in predicting a complicated IBD-course to the original DSI (pdifference>0.05). The non-invasive DSI was independently associated with a complicated IBD-course on multivariable analyses (DSI-fCal28, aOR=6.04, 95% CI 2.42-15.08; DSI-fMPO25, aOR=7.84, 95% CI 2.96-20.73).

CONCLUSIONS

The DSI-fCal and DSI-fMPO perform similarly in prognosticating the longitudinal disease course as the original DSI, whilst avoiding a need for an endoscopic assessment.