Impact of Diagnostic Delay and Associated Factors on Clinical Outcomes in a U.S. Inflammatory Bowel Disease Cohort

Preclinical Protein Signatures of Crohn's Disease and Ulcerative Colitis: A Nested Case-Control Study Within Large Population-Based Cohorts

BACKGROUND & AIMS

Biomarkers are needed to identify individuals at elevated risk of inflammatory bowel disease. This study aimed to identify protein signatures predictive of inflammatory bowel disease.

METHODS

Using large population-based cohorts (n ≥180,000), blood samples were obtained from individuals who later in life were diagnosed with inflammatory bowel disease and compared with age and sex-matched controls, free from inflammatory bowel disease during follow-up. A total of 178 proteins were measured on Olink platforms. We used machine-learning methods to identify protein signatures of preclinical disease in the discovery cohort (n = 312). Their performance was validated in an external preclinical cohort (n = 222) and assessed in an inception cohort (n = 144) and a preclinical twin cohort (n = 102).

RESULTS

In the discovery cohort, a signature of 29 proteins differentiated preclinical Crohn's disease (CD) cases from controls, with an area under the curve (AUC) of 0.85. Its performance was confirmed in the preclinical validation (AUC = 0.87) and the inception cohort (AUC = 1.0). In preclinical samples, downregulated (but not upregulated) proteins related to gut barrier integrity and macrophage functionality correlated with time to diagnosis of CD. The preclinical ulcerative colitis signature had a significant, albeit lower, predictive ability in the discovery (AUC = 0.77), validation (AUC = 0.67), and inception cohorts (AUC = 0.95). The preclinical signature for CD demonstrated an AUC of 0.89 when comparing twins with preclinical CD with matched external healthy twins, but its predictive ability was lower (AUC = 0.58; P = .04) when comparing them with their healthy twin siblings, that is, when accounting for genetic and shared environmental factors.

CONCLUSION

We identified protein signatures for predicting a future diagnosis of CD and ulcerative colitis, validated across independent cohorts. In the context of CD, the signature offers potential for early prediction.

Early diagnosis of Crohn's disease in patients presenting with a perianal fistula: systematic review and development of a perianal red flags index

BACKGROUND

Delay in diagnosing Crohn's disease (CD) in patients presenting with perianal abscess (PAA) and/or fistula (PAF) is common. The aim of this study was to identify red flags suggestive of CD.

METHODS

A systematic literature review was conducted to identify symptoms associated with CD in patients presenting with PAA/PAF. A questionnaire including those symptoms, supplemented with items from the International Organization for the Study of Inflammatory Bowel Diseases (IO-IBD) red flags index for luminal CD, was administered to all adult patients presenting with a PAF and eventually diagnosed with CD and matched patients (1:3) from the same study period with a cryptoglandular PAF (2012-2023) at a single non-academic teaching hospital. All patients were asked to recall symptoms/signs experienced during their first PAF.

RESULTS

The systematic review identified 8 articles reporting on 15 clinical characteristics in patients presenting with PAA (n = 2)/PAF (n = 6), supplemented with 13 items from the IO-IBD red flags index (28 items in total). A total of 25 patients with CD and 75 patients with PAF without CD answered the questionnaire. Univariate analysis identified seven items associated with CD (age, family history, > 2 perianal interventions, weight loss, abdominal pain, diarrhoea and fatigue), and four items remained significant in multivariate analysis: age (OR 3.4 [1.0-11.5]), > 2 previous perianal interventions (OR 3.4 [1.0-10.1]), weight loss (OR 14.4 [3.7-55.6]) and abdominal pain (OR 9.8 [1.9-49.8]). Receiver-operating characteristic curve (ROC) analysis showed that a combination of these red flags was associated with good discrimination of CD versus non-CD (AUC 0.83 [0.72-0.94]).

CONCLUSIONS

The perianal red flags index has a good predictive value for early identification of patients with PAF at risk for underlying CD.

Patient and physician factors contributing to delays in inflammatory bowel diseases: Enhancing timely diagnosis

In this article, we comment on the article by Blüthner et al. The article provides a comprehensive analysis of the factors contributing to the late detection of Crohn's disease and ulcerative colitis within a German cohort. It highlights the consequences on patient outcomes, particularly disease progression and the increased risk of developing complications. The study identifies specific predictors associated with both patient-related and physician-related delays, offering a detailed exploration of the initial approach. Additionally, the article delves into the distinct patterns observed in the German population, stressing the unique aspects of diagnostic delays that may differ from those reported in other regions. This detailed examination offers valuable insights into the specific challenges faced within the German healthcare system and underscores the necessity of targeted interventions to facilitate early diagnosis. The importance of improved screening tools, patient education, and better healthcare infrastructure is emphasized as crucial steps toward improving patient care in inflammatory bowel disease.

The prevalence of constipation in children with new diagnosis of inflammatory bowel disease (IBD): A retrospective study

OBJECTIVES

Functional constipation (FC) is a common problem in childhood and the first-line therapy is macrogol. The role of FC in the onset of inflammatory bowel disease (IBD) is poorly understood. Our main aim was to investigate the prevalence of FC in children before the diagnosis of IBD.

METHODS

This is a cross-sectional observational study in pediatric IBD-patients. We collected data on demographics, clinical and endoscopic characteristics at IBD diagnosis, and on the presence of FC and its treatment before IBD diagnosis.

RESULTS

A total of 238 children with IBD, 104 (44%) with Crohn disease (CD), 130 (56%) with ulcerative colitis (UC) and 4 (0.016%) with IBD Unclassified (IBD-U) were enrolled. The mean age was 174 ± 47 months, 56% were male. Forty-seven out of 238 (19.7%) had a FC history before the IBD diagnosis and 31 out of these 47 patients (65%) received macrogol therapy. In the FC group, we found a delay in the diagnosis of IBD compared to the group with no FC [median (interquartile range [IQR]): 5 months (2.5-9.5) and 2 months (0-4), respectively, p ≤ 0.001]. The difference in terms of endoscopic localization was statistically significant in UC patients presenting FC (p = 0.026) with a prevalence of proctitis and left side colitis (30% and 15%, respectively).

CONCLUSION

In conclusion our study highlighted a prevalence of constipation in pediatric IBD patients at diagnosis of 19.7%, which must be taken into account to avoid diagnostic delay and which is associated with limited extent of disease in UC pediatric patients.

Genome-Wide DNA Methylation Identifies Potential Disease-Specific Biomarkers and Pathophysiologic Mechanisms in Irritable Bowel Syndrome, Inflammatory Bowel Disease, and Celiac Disease

BACKGROUND AND AIMS

Irritable bowel syndrome (IBS), inflammatory bowel disease (IBD), and celiac disease (CeD) present with similar gastrointestinal (GI) symptoms. DNA methylation-based biomarkers have not been investigated as diagnostic biomarkers to classify these disorders. We aimed to study DNA methylation profiles of IBS, IBD, CeD, and healthy controls (HC), develop machine learning-based classifiers, and identify associated gene ontology (GO) terms.

METHODS

Genome-wide DNA methylation of peripheral blood mononuclear cells from 315 patients with IBS, IBD, CeD, and HC was measured using Illumina's 450K or EPIC arrays. A methylation dataset on 304 IBD and HC samples was used for external validation. Differential methylation was measured using general linear models. Classifiers were developed using penalized generalized linear models using double cross-validation controlling for confounders. Functional enrichment was assessed using GO.

RESULTS

Three hundred and fifteen participants (148 IBS, 47 IBD, 34 CeD, and 86 HC) had DNA methylation data. IBS-IBD and IBD-CeD showed the highest number of differentially methylated CpG sites followed by IBD-HC, CeD-HC, and IBS-HC. IBS-associated genes were enriched in cell adhesion and neuronal pathways, while IBD- and CeD-associated markers were enriched in inflammation and MHC class II pathways, respectively (p < 0.05). Classification performances assessed using area under the receiver operating characteristic curves (AUC) for IBS-IBD, IBS-CeD, and IBD-CeD were 0.80 (95% CI = 0.7-0.87, p = 6.75E-10), 0.78 (95% CI = 0.68-0.86, p = 4.57E-10), and 0.73 (95% CI = 0.62-0.83, p = 0.03), respectively. The performance of IBD-HC was successfully validated using external data (AUC = 0.74 [95% CI = 68-0.80, p < 0.001]).

CONCLUSIONS

Blood-based DNA methylation biomarkers can potentially distinguish chronic GI disorders that present with similar symptoms. GO suggested functional significance of the classifiers in disease-specific pathology.

The Time to Inflammatory Bowel Disease Diagnosis for Patients Presenting with Abdominal Symptoms in Primary Care and its Association with Emergency Hospital Admissions and Surgery: A Retrospective Cohort Study

BACKGROUND

Patients with inflammatory bowel disease (IBD) presenting to primary care may experience diagnostic delays. We aimed to evaluate this and assess whether time to diagnosis is associated with clinical outcomes.

METHODS

A retrospective cohort study using English primary care data from January 1, 2010, to December 31, 2019, linked to hospital admission data was undertaken. Patients were followed from the first IBD-related presentation in primary care to IBD diagnosis. Associations of time to diagnosis exceeding a year were assessed using a Robust Poisson regression model. Associations between time to diagnosis and IBD-related emergency hospital admissions and surgery were assessed using Poisson and Cox proportional hazards models, respectively.

RESULTS

Of 28 092 IBD patients, 60% had ulcerative colitis (UC) and 40% had Crohn's disease (CD). The median age was 43 (interquartile range, 30-58) years and 51.9% were female. Median time to diagnosis was 15.6 (interquartile range, 4.3-28.1) months. Factors associated with more than a year to diagnosis included female sex (adjusted risk ratio [aRR], 1.23; 95% CI, 1.21-1.26), older age (aRR, 1.05; 95% CI, 1.01-1.10; comparing >70 years of age with 18-30 years of age), obesity (aRR, 1.03; 95% CI, 1.00-1.06), smoking (aRR, 1.05; 95% CI, 1.02-1.08), CD compared with UC (aRR, 1.13; 95% CI, 1.11-1.16), and a fecal calprotectin over 500 μg/g (aRR, 0.89; 95% CI, 0.82-0.95). The highest quartile of time to diagnosis compared with the lowest was associated with IBD-related emergency admissions (incidence rate ratio, 1.06; 95% CI, 1.01-1.11).

CONCLUSION

Longer times to IBD diagnoses were associated with being female, advanced age, obesity, smoking, and Crohn's disease. More IBD-related emergency admissions were observed in patients with a prolonged time to diagnosis.

A review investigating delays in Crohn's disease diagnosis

Crohn's disease (CD) is a chronic inflammatory condition of the gastrointestinal tract where early diagnosis and timely, appropriate management are essential to prevent severe complications and reduce the need for surgery. This review sought to investigate factors contributing to diagnostic delays in CD, which typically ranged from 5 to 16 months. Delays were often due to nonspecific symptoms that could be mistaken for irritable bowel syndrome (IBS) and were influenced by various factors including age, education level, smoking, NSAID use, and disease characteristics like isolated ileal involvement. Healthcare system disparities also played a significant role, with delays varying by access to care. The review highlighted that delayed diagnosis was linked to worse disease outcomes, such as increased severity and complications, and underscored the importance of early intervention combined with timely management. Strategies to mitigate delays included implementing red flag tools, using inflammatory biomarkers like fecal calprotectin, and enhancing public and healthcare provider awareness. Addressing these factors and improving referral pathways and healthcare system efficiencies were crucial for enhancing early diagnosis and patient outcomes.

Bright Luminal Sign on High b-Value Diffusion-Weighted Magnetic Resonance Enterography Imaging as a New Biomarker to Predict Fibrotic Strictures in Crohn's Disease Patients: A Retrospective Preliminary Study

A retrospective analysis was conducted to investigate how a bright luminal sign on high b-value diffusion-weighted imaging (DWI) could be considered as a new biomarker for identifying fibrotic strictures in Crohn's disease (CD). Fibrotic strictures, due to excessive deposition of extracellular matrix following chronic inflammatory processes, can be difficult to distinguish from inflammatory strictures using endoscopy. This study was performed on 65 patients with CD who underwent MRE, and among them 32 patients showed the bright luminal sign on high b-value DWI. DWI findings were compared to pre- and post-contrast MRE data. Luminal bright sign performance results were calculated using a confusion matrix, the relationship between categorical variables was assessed by the χ2 test of independence, and the Kruskal-Wallis test (ANOVA) was used for the assessment of statistical significance of differences between groups. The results indicated a high sensitivity (90%) and specificity (85%) of the bright luminal sign for fibro-stenotic CD and a significant correlation between DWI luminal brightness and markers such as the homogeneous enhancement pattern (p < 0.001), increase in enhancement percentage from 70 s to 7 min after gadolinium injection (p < 0.001), and submucosal fat penetration (p = 0.05). These findings indicate that DWI hyperintensity can be considered as a good non-invasive indicator for the detection of severe intestinal fibrosis and may provide an efficient and accurate method for assessing fibrotic strictures. This new non-invasive biomarker could allow an early diagnosis of fibrotic stricture, delaying the onset of complications and subsequent surgery. Moreover, further evaluations through larger prospective trials with histopathological correlation are needed to confirm these results and completely determine the clinical benefits of DWI in treating CD.

Delay in diagnosis is associated with decreased treatment effectiveness in children with rumination syndrome

OBJECTIVES

Rumination syndrome (RS) is challenging to diagnose, which can lead to diagnostic delays. Our objective was to evaluate the length of time from RS symptom onset to diagnosis in patients referred to our institution and to examine whether this duration predicts treatment outcomes.

METHODS

We conducted a review of patients with RS evaluated at our institution. Data were collected from chart review and patient/family reported questionnaires. We evaluated the time from symptom onset to diagnosis over time and whether it was associated with symptom resolution.

RESULTS

We included 247 patients with RS (60% female, median age of 14 years, interquartile range [IQR]: 9-16 years). The median age at symptom onset was 11 years (IQR: 5-14 years) and median age at diagnosis was 13 years (IQR: 9-15 years) for a median duration of 1 year (IQR: 0-3 years) between symptom onset and diagnosis. Length of time between symptom onset and diagnosis did not change significantly at our institution from 2016 to 2022. Among the 164 children with outcome data, 47 (29%) met criteria for symptom resolution after treatment. A longer time to diagnosis was associated with a lower likelihood of symptom resolution after treatment (p = 0.01).

CONCLUSION

In our experience, the time to RS diagnosis after symptom onset is shorter than previously described. A longer delay in diagnosis is associated with lower likelihood of symptom resolution after treatment, emphasizing the importance of a prompt recognition of rumination symptoms and a timely diagnosis.

Fistulizing Perianal Disease as a First Manifestation of Crohn's Disease: A Systematic Review and Meta-Analysis

Background: Incidences of perianal fistulas (PAFs) as a first manifestation of Crohn's disease (CD) vary widely in the literature. Aim: To analyse the percentage of patients with a PAF preceding CD diagnosis and assess the time to diagnosis. Methods: A systematic literature search was conducted. Studies reporting on patients with a PAF preceding CD diagnosis were identified. Primary outcomes were the (weighted) percentage of patients with CD with a PAF preceding CD and their time to CD diagnosis. Secondary outcomes were the (weighted) percentage of patients with CD with a PAF preceding CD diagnosis in predefined patient subgroups, including (1) sex (men vs. women), (2) ethnicity (Asian vs. non-Asian), and (3) age (paediatric (0-18 y) and patients with elderly onset CD (>60 y) vs. adult patients (18-60 y)). Results: Seventeen studies were included (34,030 patients with CD). In the overall CD population, a PAF preceded CD in 8.6% [95%CI; 5.72; 12.71] with a weighted mean time to CD diagnosis of 45.9 (31.3) months. No studies reported details on sex differences in patients with a PAF as a manifesting sign of CD. In Asian populations, a PAF preceded CD in 17.66% [95%CI; 11.45; 26.25], which was significantly higher when compared with non-Asians (4.99% [95%CI; 3.75; 6.60], OR:3.99, p < 0.0001). In adolescents, an incidence of 9.17% [95%CI; 5.92; 13.93] was found with significantly lower incidences in paediatric patients (6.38% [95%CI; 1.84; 19.85], OR:0.53, p < 0.0001), and elderly-onset patients (3.77% [95%CI; 1.68; 8.25], OR:0.44, p = 0.0035). Conclusions: This systematic review shows that in the literature, almost 10% of patients present with a PAF as a first manifestation of CD, with a mean time to diagnosis of almost four years. These results emphasise that increased clinical awareness is needed.

Diagnostic delay in inflammatory bowel diseases in a German population

BACKGROUND

Early diagnosis is key to prevent bowel damage in inflammatory bowel disease (IBD). Risk factor analyses linked with delayed diagnosis in European IBD patients are scarce and no data in German IBD patients exists.

AIM

To identify risk factors leading to prolonged diagnostic time in a German IBD cohort.

METHODS

Between 2012 and 2022, 430 IBD patients from four Berlin hospitals were enrolled in a prospective study and asked to complete a 16-item questionnaire to determine features of the path leading to IBD diagnosis. Total diagnostic time was defined as the time from symptom onset to consulting a physician (patient waiting time) and from first consultation to IBD diagnosis (physician diagnostic time). Univariate and multivariate analyses were performed to identify risk factors for each time period.

RESULTS

The total diagnostic time was significantly longer in Crohn's disease (CD) compared to ulcerative colitis (UC) patients (12.0 vs 4.0 mo; P < 0.001), mainly due to increased physician diagnostic time (5.5 vs 1.0 mo; P < 0.001). In a multivariate analysis, the predominant symptoms diarrhea (P = 0.012) and skin lesions (P = 0.028) as well as performed gastroscopy (P = 0.042) were associated with longer physician diagnostic time in CD patients. In UC, fever was correlated (P = 0.020) with shorter physician diagnostic time, while fatigue (P = 0.011) and positive family history (P = 0.046) were correlated with longer physician diagnostic time.

CONCLUSION

We demonstrated that CD patients compared to UC are at risk of long diagnostic delay. Future efforts should focus on shortening the diagnostic delay for a better outcome in these patients.

Sources of diagnostic delay for people with Crohn's disease and ulcerative colitis: Qualitative research study

OBJECTIVE

An improved understanding of the causes and experience of diagnostic delay in Inflammatory Bowel Disease (IBD).

METHODS

Framework analysis of semi-structured interviews with 20 adults with IBD.

RESULTS

Participants' prior knowledge of normal bowel function/IBD was limited. Symptoms were sometimes misattributed to mild/transient conditions or normalised until intolerable. Family pressures, work, education, mistrust of doctors, fear and embarrassment could exacerbate delays. Poor availability of face-to-face appointments deterred people from seeing a GP. Patients feared that by the time they got to see their GP, their symptoms would have resolved. Patients instead self-managed symptoms, but often regretted not seeking help earlier. Limited time in consultations, language barriers, embarrassment, and delays in test results subsequently delayed specialist referrals. GPs misattributed symptoms to other conditions due to atypical or non-specific presentations, leading to reduced trust in health systems. Patients complained of poor communication, delays in accessing test results, appointments, and onward referrals-all associated with clinical deterioration. GPs were sometimes unable to 'fast-track' patients into specialist care. Consultations and endoscopies were often difficult experiences for patients, especially for non-English speakers who are also less likely to receive information on mental health support and the practicalities of living with IBD.

CONCLUSIONS

The framework analysis demonstrates delay in the diagnosis of IBD at each stage of the patient journey.

RECOMMENDATIONS

Greater awareness of IBD amongst the general population would facilitate presentation to healthcare services through symptom recognition by individuals and community advice. Greater awareness in primary care would help ensure IBD is included in differential diagnosis. In secondary care, greater attention to the wider needs of patients is needed-beyond diagnosis and treatment. All clinicians should consider atypical presentations and the fluctuating nature of IBD. Diagnostic overshadowing is a significant risk-where other diagnoses are already in play the risk of delay is considerable.

Estimated Glomerular Filtration Rate and the Risk of Inflammatory Bowel Disease in Adults: A Swedish Population-Based Study

BACKGROUND

Kidney complications are common in patients with long-standing inflammatory bowel disease (IBD). Whether kidney complications, defined as low estimated glomerular filtration rate (eGFR), may predispose to later IBD is unknown.

METHODS

We analyzed the association between eGFR and the risk of being subsequently diagnosed with IBD among 1 612 160 adults from Stockholm. The exposure was categories of eGFR, with 90 to 104 mL/min/1.73 m2 as the reference. Cox regression models were used to investigate the association between eGFR, IBD, and IBD subtypes. Subgroup analyses included age strata, sex, education, and comorbidities. To explore the possibility of detection bias or reverse causation, we estimated IBD hazard ratios (HRs) after excluding cases and individuals censored during early years of follow-up.

RESULTS

During a median of 9 years of follow-up, we detected 9663 cases of IBD (3299 Crohn's disease, 5072 ulcerative colitis, 1292 IBD unclassified). Lower eGFR levels were associated with higher IBD risk (for eGFR 30-59 mL/min/1.73 m2: adjusted HR, 1.15; 95% confidence interval [CI], 1.01-1.33; and for eGFR <30 mL/min/1.73 m2: adjusted HR, 1.65; 95% CI, 1.16-2.37). This association was stronger in magnitude for Crohn's disease (for eGFR 30-59 mL/min/1.73 m2: HR, 1.33, 95% CI, 1.04-1.72; and for eGFR <30 mL/min/1.73 m2: HR, 2.25; 95% CI, 1.26-3.99). Results were consistent across strata of age, comorbidities, and attained education but suggested the association between eGFR and IBD to be stronger in women (P for interaction <.05). Results attenuated but were robust to exclusion of early IBD cases.

CONCLUSIONS

We observed an association between reduced eGFR and the risk of developing IBD, which was stronger in magnitude for Crohn's disease.

Racial and ethnic differences in diagnosis age and blood biomarkers in a pediatric inflammatory bowel disease cohort

OBJECTIVE

Prompt diagnosis of pediatric-onset inflammatory bowel disease (IBD) is crucial for preventing a complicated disease course; however, it is not well understood how social determinants of health might affect pediatric IBD diagnosis. This study examined differences in diagnosis age, biomarkers of disease severity, and anthropometrics with sociodemographic factors in a pediatric IBD cohort.

METHODS

Pediatric IBD patients (n = 114) and their parents/caregivers were enrolled from the Children's of Alabama Pediatric IBD Clinic in Birmingham, Alabama. Primary analyses examined associations of child race and ethnicity, parental income, parental education, single-parent household status, insurance type, and distance to a tertiary pediatric gastroenterology referral center with diagnosis age. Secondary analyses examined differences in biomarker levels, height, and body mass index at the time of diagnosis.

RESULTS

Racial and ethnic minority children were diagnosed at an older age compared to Non-Hispanic White children (14.4 ± 0.40 vs. 11.7 ± 0.38 years; p < 0.001), and this trend was robust to adjustment with other sociodemographic variables. Parental attainment of a college education attenuated the link between minority race and ethnicity and the likelihood of older age at diagnosis, while other sociodemographic variables had no moderating effect. Racial and ethnic minority children were 5.7 times more likely to have clinically elevated erythrocyte sedimentation rate at diagnosis compared to Non-Hispanic White children (p = .024).

CONCLUSIONS

These results suggest that child race and ethnicity may exert a primary effect on the age at diagnosis with pediatric-onset IBD. This study highlights the need for further research on racial and ethnic disparities to promote health equity in pediatric-onset IBD.

Can vulvar edema be the presenting sign of Crohn's disease? A case series

Vulvar involvement as an extraintestinal manifestation of Crohn's disease (CD) is a challenging diagnosis considering that vaginal findings may precede gastrointestinal symptoms. The aim of this study is to describe the clinical presentation, radiological findings, and treatment of vulvar Crohn's disease (VCD). We reviewed the time from initial presentation to diagnosis, presenting symptoms, radiological findings, gastrointestinal Crohn's disease Paris classification, and treatment response of five female pediatric patients. All the patients had radiological findings of vulvar inflammation on magnetic resonance imaging. Vaginal symptoms preceded gastrointestinal disease in two of the patients, which correlated with a delay in diagnosis. All patients had active disease on colonoscopy, with three of them having significant colorectal inflammation. Four of the patients were treated with infliximab, while one patient received ustekinumab with a resolution of their symptoms. In conclusion, VCD can precede gastrointestinal symptoms and is easily miss-diagnosed, leading to a delayed Crohn's disease diagnosis and treatment.

[Influence of diagnostic period on the outcomes in patients with Crohn's disease]

OBJECTIVE

To analyze archival data on emergency hospitalization of patients with Crohn's disease, indications for surgical treatment, structure of surgeries, localization of gastrointestinal lesions and relationship between diagnostic period and surgical treatment.

MATERIAL AND METHODS

A retrospective analysis of medical records of patients with Crohn's disease in 3 large hospitals was performed over the past 6 years. We estimated cases of surgical treatment, localization of gastrointestinal lesions, clinical and laboratory parameters of patients, period between clinical manifestation and diagnosis, as well as outcomes of disease depending on duration of diagnostic searching.

CONCLUSION

Duration of diagnostic searching in patients with Crohn's disease is a significant predictor of complications and surgical treatment.

Absolute and Relative Risks of Kidney and Urological Complications in Patients With Inflammatory Bowel Disease

INTRODUCTION

The burden of kidney and urological complications in patients with inflammatory bowel disease (IBD) remains poorly characterized.

METHODS

We analyzed association between developing IBD (as a time-varying exposure) and relative risks of receiving diagnoses of chronic kidney disease (CKD), acute kidney injury (AKI), or kidney stones, and experiencing a clinically-relevant decline in estimated glomerular filtration rate (eGFR) (CKD progression; composite of kidney failure or an eGFR decline ≥30%) in 1,682,795 individuals seeking healthcare in Stockholm, Sweden, during 2006-2018. We quantified 5- and 10-year absolute risks of these complications in a parallel matched cohort of IBD cases and random controls matched (1:5) on sex, age, and eGFR.

RESULTS

During median 9 years, 10,117 participants developed IBD. Incident IBD was associated with higher risks of kidney-related complications compared with non-IBD periods: hazard ratio (HR) (95% confidence interval) was 1.24 (1.10-1.40) for receiving a CKD diagnosis and 1.11 (1.00-1.24) for CKD progression. For absolute risks, 11.8% IBD cases had a CKD event within 10-year. Of these, 6.4% received a CKD diagnosis, and 7.9% reached CKD progression. The risks of AKI (HR 1.97 [1.70-2.29]; 10-year absolute risk 3.6%) and kidney stones (HR 1.69 [1.48-1.93]; 10-year absolute risk 5.6%) were also elevated. Risks were similar in Crohn's disease and ulcerative colitis.

DISCUSSION

More than 10% of patients with IBD developed CKD within 10-year from diagnosis, with many not being identified through diagnostic codes. This, together with their elevated AKI and kidney stone risks, highlights the need of established protocols for kidney function monitoring and referral to nephrological/urological care for patients with IBD.

A Machine Learning-Based Diagnostic Model for Crohn's Disease and Ulcerative Colitis Utilizing Fecal Microbiome Analysis

Recent research has demonstrated the potential of fecal microbiome analysis using machine learning (ML) in the diagnosis of inflammatory bowel disease (IBD), mainly Crohn's disease (CD) and ulcerative colitis (UC). This study employed the sparse partial least squares discriminant analysis (sPLS-DA) ML technique to develop a robust prediction model for distinguishing among CD, UC, and healthy controls (HCs) based on fecal microbiome data. Using data from multicenter cohorts, we conducted 16S rRNA gene sequencing of fecal samples from patients with CD (n = 671) and UC (n = 114) while forming an HC cohort of 1462 individuals from the Kangbuk Samsung Hospital Healthcare Screening Center. A streamlined pipeline based on HmmUFOTU was used. After a series of filtering steps, 1517 phylotypes and 1846 samples were retained for subsequent analysis. After 100 rounds of downsampling with age, sex, and sample size matching, and division into training and test sets, we constructed two binary prediction models to distinguish between IBD and HC and CD and UC using the training set. The binary prediction models exhibited high accuracy and area under the curve (for differentiating IBD from HC (mean accuracy, 0.950; AUC, 0.992) and CD from UC (mean accuracy, 0.945; AUC, 0.988)), respectively, in the test set. This study underscores the diagnostic potential of an ML model based on sPLS-DA, utilizing fecal microbiome analysis, highlighting its ability to differentiate between IBD and HC and distinguish CD from UC.

Disease Flares Following COVID-19 Vaccination in Patients with Inflammatory Bowel Disease

Objective Flares of inflammatory bowel disease (IBD) can occur infrequently after vaccination for coronavirus disease 2019 (COVID-19), although the details of this phenomenon are poorly understood. To clarify the possibility of an unfavorable response in patients with IBD, we investigated IBD-related symptoms during the COVID-19 vaccination. Methods Between October 2021 and February 2022, we obtained the COVID-19 vaccination status of 411 IBD patients who were being treated at our institution. The disease course of IBD after vaccination was investigated in 188 patients with ulcerative colitis (UC) and 119 patients with Crohn's disease (CD) who had received at least one dose of the vaccine during the clinical remission phase. The baseline characteristics before vaccination were compared between the patients with UC with or without disease flares. Results During the 30-day follow-up period, eight patients with UC (4.3%) and one patient with CD (0.8%) experienced disease flares following vaccination. Disease flares occurred after the first vaccination in six patients and after the second vaccination in three patients. As for the timing of onset of disease flares, eight events (88.9%) occurred within one week of vaccination. Two patients required hospitalization, and one patient with CD required surgery for an intra-abdominal abscess. The baseline characteristics did not significantly differ between patients with UC who experienced flares and those who did not. Conclusion IBD flares following COVID-19 vaccination are rare and vaccination should therefore be recommended for patients with IBD. However, the possibility of disease flares should be considered for approximately one week after each vaccination, especially in patients with UC.

Gender Biases and Diagnostic Delay in Inflammatory Bowel Disease: Multicenter Observational Study

BACKGROUND

Female gender could be a cause of diagnostic delay in inflammatory bowel disease (IBD). The aim of this study was to investigate the diagnostic delay in women vs men and potential causes.

METHODS

This multicenter cohort study included 190 patients with recent diagnosis of IBD (disease duration <7 months). Reconstruction of the clinical presentation and diagnostic process was carried out in conjunction with the semistructured patient interview, review, and electronic medical records.

RESULTS

The median time from symptom onset to IBD diagnosis was longer in women than in men: 12.6 (interquartile range, 3.7-31) vs 4.5 (2.2-9.8) months for Crohn's disease (CD; P = .008) and 6.1 (3-11.2) vs 2.7 (1.5-5.6) months for ulcerative colitis (UC; P = .008). Sex was an independent variable related to the time to IBD diagnosis in Cox regression analysis. The clinical presentation of IBD was similar in both sexes. Women had a higher percentage of misdiagnosis than men (CD, odds ratio [OR], 3.9; 95% confidence [CI], 1.5-9.9; UC, OR 3.0; 95% CI, 1.2-7.4). Gender inequities in misdiagnosis were found at all levels of the health system (emergency department, OR 2.4; 95% CI, 1.1-5.1; primary care, OR 2.5; 95% CI, 1.3-4.7; gastroenterology secondary care, OR 3.2; 95% CI, 1.2-8.4; and hospital admission, OR 4.3; 95% CI, 1.1-16.9).

CONCLUSIONS

There is a longer diagnostic delay in women than in men for both CD and UC due to a drawn-out evaluation of women, with a higher number of misdiagnoses at all levels of the health care system.

The Earlier You Find, the Better You Treat: Red Flags for Early Diagnosis of Inflammatory Bowel Disease

Delayed diagnosis is a challenge in the management of inflammatory bowel disease (IBD). Several studies show a significant association between diagnostic delay and disease progression to complications and surgery, especially in Crohn's disease (CD). What risk factors are associated with diagnostic delay in IBD remains unclear. In order to reduce diagnostic delay, the Red Flags Index has been developed and validated. The combination of the Red Flags Index score and non-invasive biomarkers such as fecal calprotectin seems to be highly accurate in screening patients with underlying IBD to be referred for further diagnostic workup and eventual early effective treatment strategies. Our literature review aims to obtain a comprehensive overview of the impacts of diagnostic delay in IBD on the potential risk factors associated with IBD, how diagnostic tools may be effective in reducing diagnostic delay, and future perspectives in this field.

Factors associated with delayed diagnosis of Crohn's disease: A systematic review and meta-analysis

Background

Delayed diagnosis is a major barrier to the effective management of Crohn's disease (CD). Several studies have investigated factors responsible for delays in diagnosis, but no meta-analyses have systematically assessed the impact of these factors.

Aim

To assess the impact of various factors on the delayed diagnosis of CD.

Methods

PubMed, EMBASE, and Web of Science databases were searched to identify observational studies published before April 2022 that assessed factors associated with delays in CD diagnosis. Further, we excluded review articles, case reports, or commentaries without original data. We pooled effect siee distinct samples. The assessment of study quality was performed utilizing the Newcastle-Ottawa Scale, while the presence of between-study heterogeneity was investigated. For a visual appraisal of potential publication bias, a funnel plot was employed. The study protocol was registered with PROSPERO, CRD42022322251.

Results

A total of 18 studies were included in the paper, covering 13 countries. The study sample consisted of 9669 cases. Ileal CD (OR = 1.46, 95 % CI = 1.21-1.76), smoking at the time of diagnosis (OR = 1.19, 95 % CI = 1.02-1.38), and use of NSAIDs (OR = 1.34, 95 % CI = 1.04-1.72) were significantly associated with a delay in CD diagnosis. However, no significant associations were observed between diagnostic delay and sex, age, endoscopic ileocolonoscopy, or diarrhea. Funnel plot analysis, indicating potential risks of publication bias, suggested the existence of unpublished or unreported study findings.

Conclusion

The findings suggest that ileal CD, use of NSAIDs, and smoking are risk factors for the delayed diagnosis of CD. Enhancing education of patients and primary care providers about these factors is warranted.

Questionnaire Survey for Inflammatory Bowel Disease Patients in Japan; A Web-Based Japan, Crohn's Disease, Ulcerative Colitis, Patients Survey

Background/Aims

The prevalence of inflammatory bowel disease (IBD) in Japan has been increasing. We aimed to clarify the symptoms of patients with IBD in Japan using an internet-based questionnaire survey.

Methods

Overall, 805 patients with IBD were asked to complete an internet-based questionnaire addressing their history of disturbances in daily activities, prevalence of fecal urgency, incontinence, and treatment preferences.

Results

Responses were obtained from 447 patients with IBD (mean age: 54 years; 70% were men), comprising 363 patients with ulcerative colitis (UC), and 84 with Crohn's disease (CD). Notably, 16% of patients with UC and 35% with CD took over 1 year until the diagnosis of IBD, and 5% of patients with CD visited more than 5 medical institutions. Patients with CD were more likely to experience disturbances in their diet, work, travel, and outings than those with UC. Fecal urgency and incontinence were significantly more frequent in patients with CD than in those with UC (72% vs. 44%, and 50% vs. 26%, respectively). In contrast, 26% of the men and 37% of women with IBD had constipation. Acid reflux, sleep disorders, and depressive symptoms were present in approximately 30% of the patients. Oral administration was preferred.

Conclusions

Patients with IBD in Japan experience more severe disturbances in their daily activities, and these are more severe in those with CD than those with UC. In addition to fecal urgency and incontinence, care is required for constipation, acid reflux, sleep disorders, and depressive symptoms.

Disparities in Pediatric Specialty Referral Scheduling and Completion

OBJECTIVE

To estimate differences in scheduled and completed specialty referrals by race, ethnicity, language for care, and insurance type.

STUDY DESIGN

We studied a retrospective cohort of 38 334 specialty referrals to a large children's hospital between March 2019 and March 2021. We included referrals for patients with primary care clinics within 5 miles of the hospital. We examined whether the odds of and time to scheduled and completed referrals differed by patient sociodemographic characteristics.

RESULTS

Of all referrals, 62% were scheduled and 54% were completed. Referral completion rates were lower for patients with Black race (45%), Native Hawaiian/Pacific Islander race (48%), Spanish language (49%), and public insurance (47%). Odds of scheduled and completed referral were lower for Asian (aOR scheduled: 0.94, [95% CI: 0.89, 0.99]; aOR completed: 0.92 [0.87, 0.97]), Black (aOR scheduled: 0.86 [0.79, 0.94]; aOR completed: 0.80 [0.73, 0.87]), and publicly insured patients (aOR scheduled: 0.71 [0.66, 0.75]; aOR completed: 0.70 [0.66, 0.75]). Time to scheduled and completed referral was longer for Black (adjusted hazard ratio [aHR] scheduled: 0.93 [0.88, 0.98]; aHR completed: 0.93 [0.87, 0.99]) and publicly insured patients (aHR scheduled: 0.85 [0.82, 0.88]; aHR completed: 0.84 [0.80, 0.87]) and families with a language other than English (aHR scheduled: 0.66 [0.62, 0.70]; aHR completed: 0.92 [0.86, 0.99]).

CONCLUSIONS

Within a geographically homogenous pediatric population, the odds and time to scheduled and completed specialty referrals differed by sociodemographic characteristics, suggesting the effects of discrimination. To improve access equity, health care organizations need clear and consistent referral workflows and more comprehensive metrics for access.

Systematic Review of Diagnostic Delay for Children With Inflammatory Bowel Disease

OBJECTIVES

Pediatric inflammatory bowel disease (IBD) is a complex inflammatory condition of the gut. Diagnosing IBD involves distinct longitudinal periods from first symptoms to primary care assessment, tertiary care referral, and then endoscopic confirmation. The term diagnostic delay (DD) is used if these periods are prolonged. The aim of this review was to amalgamate DD data for children with IBD, and identify factors associated with prolonged DD.

METHODS

Six health literature databases were searched (December 2020). Inclusion criteria for papers were children diagnosed with IBD before the age of 18 years, DD central tendency data, and to report a central tendency of their DD data, cohort >10 children. For analysis, all data were weighted by cohort sample size.

RESULTS

Searches identified 236 papers, and 26 were included in the final analysis with a pooled cohort of 7030 children. The overall DD periods were IBD 4.5 months [Interquartile range (IQR) 3.6-8.7 months], Crohn disease (CD) 5 months (IQR 4-7.2 months), and ulcerative colitis/indeterminate colitis/IBD-unclassified (UC/IC/IBDU) 3 months (IQR 2.2-4.9 months). The difference between subtypes was significant ( P < 0.001), with shorter DD for UC/IC/IBDU than CD ( P < 0.001) and IBD ( P < 0.001). DD periods were longer for CD than IBD ( P < 0.001). DD decreased over time for IBD ( P < 0.001) and UC ( P < 0.001) but the trend suggested an increase for CD ( P 0.069).

CONCLUSIONS

This data can be used to benchmark DD for children with IBD. Individual centers could determine whether improvements to awareness or infrastructure may reduce DD in order to minimize the risk of poor outcomes.

Systematic review with meta-analysis: Time to diagnosis and the impact of delayed diagnosis on clinical outcomes in inflammatory bowel disease

BACKGROUND

The impact of diagnostic delay on the clinical course of inflammatory bowel disease (IBD) remains uncertain.

AIM

To perform a systematic review of time to diagnosis and the impact of delayed diagnosis on clinical outcomes in Crohn's disease (CD) and ulcerative colitis (UC).

METHODS

We searched EMBASE and Medline from inception to 30th November 2022 for studies reporting diagnostic interval, from symptom onset to IBD diagnosis. We calculated the median, interquartile range (IQR) and pooled weighted median, of median diagnostic intervals of eligible studies. We defined delayed diagnosis as individuals above the 75th centile of longest time to diagnosis in each study. Using random effects meta-analysis, we pooled odds ratios (ORs) with 95% confidence intervals (CI) for studies reporting clinical outcomes, according to delayed diagnosis.

RESULTS

One hundred and one studies representing 112,194 patients with IBD (CD = 59,359; UC = 52,835) met inclusion criteria. The median of median times to diagnosis was 8.0 (IQR: 5.0-15.2) and 3.7 months (IQR: 2.0-6.7) in CD and UC, respectively. In high-income countries, this was 6.2 (IQR: 5.0-12.3) and 3.2 months (IQR: 2.2-5.3), compared with 11.7 (IQR: 8.3-18.0) and 7.8 months (IQR: 5.2-21.8) in low-middle-income, countries, for CD and UC respectively. The pooled weighted median was 7.0 (95% CI: 3.0-26.4) and 4.6 (95% CI: 1.0-96.0) months, for CD and UC respectively. Eleven studies, representing 6164 patients (CD = 4858; UC = 1306), were included in the meta-analysis that examined the impact of diagnostic delay on clinical outcomes. In CD, delayed diagnosis was associated with higher odds of stricturing (OR = 1.88; CI: 1.35-2.62), penetrating disease (OR = 1.64; CI: 1.21-2.20) and intestinal surgery (OR = 2.24; CI: 1.57-3.19). In UC, delayed diagnosis was associated with higher odds of colectomy (OR = 4.13; CI: 1.04-16.40).

CONCLUSION

Delayed diagnosis is associated with disease progression in CD, and intestinal surgery in both CD and UC. Strategies are needed to achieve earlier diagnosis of IBD.

Diagnostic delay in adult inflammatory bowel disease: A systematic review

BACKGROUND

The extent of diagnostic delay in inflammatory bowel disease (IBD) is incompletely understood. We aimed to understand the extent of diagnostic delay of IBD in adults and identify associations between patient or healthcare characteristics and length of delay.

METHODS

Articles were sourced from EMBASE, Medline and CINAHL from inception to April 2021. Inclusion criteria were adult cohorts (18 ≥ years old) reporting median time periods between onset of symptoms for Crohn's disease (CD), ulcerative colitis (UC) or IBD (i.e. CD and UC together) and a final diagnosis (diagnostic delay). Narrative synthesis was used to examine the extent of diagnostic delay and characteristics associated with delay. Sensitivity analysis was applied by the removal of outliers.

RESULTS

Thirty-one articles reporting median diagnostic delay for IBD, CD or UC were included. After sensitivity analysis, the majority of IBD studies (7 of 8) reported a median delay of between 2 and 5.3 months. From the studies examining median delay in UC, three-quarters (12 of 16) reported a delay between 2 and 6 months. In contrast, three-quarters of the CD studies (17 of 23) reported a delay of between 2 and 12 months. No characteristic had been examined enough to understand their role in diagnostic delay in these populations.

CONCLUSIONS

This systematic review provides robust insight into the extent of diagnostic delay in IBD and suggests further intervention is needed to reduce delay in CD particularly. Furthermore, our findings provide a benchmark value range for diagnostic delay, which such future work can be measured against.

Long-term risk of inflammatory bowel disease after endoscopic biopsy with normal mucosa: A population-based, sibling-controlled cohort study in Sweden

BACKGROUND

Although evidence suggests a persistently decreased risk of colorectal cancer for up to 10 years among individuals with a negative endoscopic biopsy result (i.e., normal mucosa), concerns have been raised about other long-term health outcomes among these individuals. In this study, we aimed to explore the long-term risk of inflammatory bowel disease (IBD) after an endoscopic biopsy with normal mucosa.

METHODS AND FINDINGS

In the present nationwide cohort study, we identified all individuals in Sweden with a lower or upper gastrointestinal (GI) biopsy of normal mucosa during 1965 to 2016 (exposed, n = 200,495 and 257,192 for lower and upper GI biopsy, respectively), their individually matched population references (n = 989,484 and 1,268,897), and unexposed full siblings (n = 221,179 and 274,529). Flexible parametric model estimated hazard ratio (HR) as an estimate of the association between a GI biopsy of normal mucosa and IBD as well as cumulative incidence of IBD, with 95% confidence interval (CI). The first 6 months after GI biopsy were excluded to avoid detection bias, surveillance bias, or reverse causation. During a median follow-up time of approximately 10 years, 4,853 individuals with a lower GI biopsy of normal mucosa developed IBD (2.4%) compared to 0.4% of the population references. This corresponded to an incidence rate (IR) of 20.39 and 3.39 per 10,000 person-years in the respective groups or 1 extra estimated IBD case among 37 exposed individuals during the 30 years after normal GI biopsy. The exposed individuals had a persistently higher risk of overall IBD (average HR = 5.56; 95% CI: 5.28 to 5.85), ulcerative colitis (UC, average HR = 5.20; 95% CI: 4.85 to 5.59) and Crohn's disease (CD, average HR = 6.99; 95% CI: 6.38 to 7.66) than their matched population references. In the sibling comparison, average HRs were 3.27 (3.05 to 3.51) for overall IBD, 3.27 (2.96 to 3.61) for UC, and 3.77 (3.34 to 4.26) for CD. For individuals with an upper GI biopsy of normal mucosa, the average HR of CD was 2.93 (2.68 to 3.21) and 2.39 (2.10 to 2.73), compared with population references and unexposed full siblings, respectively. The increased risk of IBD persisted at least 30 years after cohort entry. Study limitations include lack of data on indications for biopsy and potential residual confounding from unmeasured risk or protective factors for IBD.

CONCLUSIONS

Endoscopic biopsy with normal mucosa was associated with an elevated IBD incidence for at least 30 years. This may suggest a substantial symptomatic period of IBD and incomplete diagnostic examinations in patients with early IBD.

Gut microbiota in the early stage of Crohn’s disease has unique characteristics

Background

Emerging evidence suggests that gut microbiota plays a predominant role in Crohn’s disease (CD). However, the microbiome alterations in the early stage of CD patients still remain unclear. The present study aimed to identify dysbacteriosis in patients with early CD and explore specific gut bacteria related to the progression of CD.

Methods

This study was nested within a longitudinal prospective Chinese CD cohort, and it included 18 early CD patients, 22 advanced CD patients and 30 healthy controls. The microbiota communities were investigated using high-throughput Illumina HiSeq sequencing targeting the V3–V4 region of 16S ribosomal DNA (rDNA) gene. The relationship between the gut microbiota and clinical characteristics of CD was analyzed.

Results

Differential microbiota compositions were observed in CD samples (including early and advanced CD samples) and healthy controls samples. Notably, Lachnospiracea_incertae_sedis and Parabacteroides were enriched in the early CD patients, Escherichia/Shigella, Enterococcus and Proteus were enriched in the advanced CD patients, and Roseburia, Gemmiger, Coprococcus, Ruminococcus 2, Butyricicoccus, Dorea, Fusicatenibacter, Anaerostipes, Clostridium IV were enriched in the healthy controls [LDA score (log10) > 2]. Furthermore, Kruskal–Wallis Rank sum test results showed that Blautia, Clostridium IV, Coprococcus, Dorea, Fusicatenibacter continued to significantly decrease in early and advanced CD patients, and Escherichia/Shigella and Proteus continued to significantly increase compared with healthy controls (P < 0.05). The PICRUSt analysis identified 16 remarkably different metabolic pathways [LDA score (log10) > 2]. Some genera were significantly correlated with various clinical parameters, such as fecal calprotectin, erythrocyte sedimentation rate, C-reactive protein, gland reduce, goblet cells decreased, clinical symptoms (P < 0.05).

Conclusions

Dysbacteriosis occurs in the early stage of CD and is associated with the progression of CD. This data provides a foundation that furthers the understanding of the role of gut microbiota in CD’s pathogenesis.

Ultra-Fast Portable and Wearable Sensing Design for Continuous and Wide-Spectrum Molecular Analysis and Diagnostics

The design and characterization of spatiotemporal nano-/micro-structural arrangement that enable real-time and wide-spectrum molecular analysis is reported and demonestrated in new horizons of biomedical applications, such as wearable-spectrometry, ultra-fast and onsite biopsy-decision-making for intraoperative surgical oncology, chiral-drug identification, etc. The spatiotemporal sesning arrangement is achieved by scalable, binder-free, functionalized hybrid spin-sensitive (<↑| or <↓|) graphene-ink printed sensing layers on free-standing films made of porous, fibrous, and naturally helical cellulose networks in hierarchically stacked geometrical configuration (HSGC). The HSGC operates according to a time-space-resolved architecture that modulate the mass-transfer rate for separation, eluation and detection of each individual compound within a mixture of the like, hereby providing a mass spectrogram. The HSGC could be used for a wide range of applictions, including fast and real-time spectrogram generator of volatile organic compounds during liquid-biopsy, without the need of any immunochemistry-staining and complex power-hungry cryogenic machines; and wearable spectrometry that provide spectral signature of molecular profiles emiited from skin in the course of various dietry conditions.

Patient Experiences in the Management of Inflammatory Bowel Disease: A Qualitative Study

BACKGROUND

Inflammatory bowel disease (IBD) can lead to substantial impairments of quality-of-life. Clinical guidelines and quality indicators aid physicians in practice but may not reflect the perspectives and experiences of patients with IBD. To address this, the objectives of this study were to understand patient experiences with IBD care and to explore priorities.

METHODS

Based on a convenience sample of 36 participants, five focus groups were completed at four sites across Canada. Data were analyzed using a deductive thematic analysis approach to assess emergent themes and variability in participants' experiences.

RESULTS

Our results are organized by themes of structure, process and outcomes to illustrate common issues with respect to how care is organized in the healthcare system, how patients receive and experience care and how patients perceive the outcomes of their care. Our results frame a health systems quality approach that signal needed improvements in access to care, the need for innovation with respect to virtual medicine, the potential expansion of multidisciplinary team-based care and the importance of addressing the psychosocial dimensions for patients with IBD and their caregivers in order to better deliver patient-centred care.

CONCLUSIONS

The issues identified have the potential to impact priority areas in the system, IBD care delivery, and how outcomes can be improved by focusing on 'lived experience' and patient-centred care. The differing values and perspectives of all those involved in caring for patients with IBD underscore the importance of good communication with patients, caregivers and family members, as well as staying responsive to evolving needs.

Racial and Ethnic Variation in Presentation, Diagnosis, Treatment, and Outcome of Pediatric Crohn Disease: A Single Center Study

OBJECTIVES

Disparities in health care for racial/ethnic minority children in the United States who are burdened by pediatric Crohn's disease (PCD) are not well understood.

METHODS

A retrospective review of the Texas Children's Hospital ImproveCareNow database from 2007 to 2015 was performed. CD patients with a minimum of 2-year follow-up were included if the onset of symptoms attributable to inflammatory bowel disease was clearly documented. We primarily aimed to identify race and ethnicity associations in diagnostic delay, presentation, treatment, and 2-year outcomes. We also examined early versus late diagnosis (ie, over 6 months from disease onset) associations with these variables unrelated to race/ethnicity.

RESULTS

One hundred and sixty-six PCD patients [57.8% non-Hispanic White (NH-White), 18.1% African American (AA), and 15.7% Hispanic] met selection criteria. Time to diagnosis was shorter in Hispanic patients ( P < 0.01) and they were older at diagnosis than NH-White patients ( P = 0.0164). AA patients (33%, P < 0.01) and Hispanic patients (35%, P < 0.05) had lower rates of granuloma detection than NH-White patients (63%). AA patients had lower rates of steroid-free remission (SFR) at 2 years than NH-White patients ( P < 0.05). Higher ESR and lower hemoglobin levels were associated with early diagnosis ( P < 0.01). Early diagnosis was associated with higher rates of surgery within 2 years of diagnosis ( P < 0.05). Diagnostic fecal calprotectin levels inversely associated with SFR at 2 years ( P < 0.05). Early use of biologics positively, and early use of corticosteroids negatively correlated with 2-year SFR ( P < 0.05).

CONCLUSIONS

Race and ethnicity may influence the diagnosis, treatment, and outcomes of PCD. This recognition presents a nidus toward establishing equity in PCD care.

Early Diagnosis, Early Stratification, and Early Intervention to Deliver Precision Medicine in IBD

Despite huge advances in understanding the molecular basis of IBD, clinical management has continued to rely on a "trial and error" approach. In addition, a therapeutic ceiling has emerged whereby even the most effective interventions are only beneficial for approximately 30% of patients. Consequently, several tools have been developed to aid stratification and guide treatment-decisions. We review the potential application for many of these precision medicine approaches, which are now almost within reach. We highlight the importance of early action (and avoiding inaction) to ensure the best outcomes for patients and how combining early action with precision tools will likely ensure the right treatment is delivered at the right time and place for each individual person living with IBD. The lack of clinical impact to date from precision medicine, despite much hype and investment, should be tempered with the knowledge that clinical translation can take a long time, and many promising breakthroughs might be ready for clinical implementation in the near future. We discuss some of the remaining challenges and barriers to overcome for clinical adoption. We also highlight that early recognition, early diagnosis, early stratification, and early intervention go hand in hand with precision medicine tools. It is the combination of these approaches that offer the greatest opportunity to finally deliver on the promise of precision medicine in IBD.

Diagnostic Delay in Paediatric Inflammatory Bowel Disease-A Systematic Investigation

Diagnostic delays (time from the first symptoms to diagnosis) are common in inflammatory bowel disease (IBD) and may lead to worse disease progression and treatment outcomes. This study aimed to determine the duration of diagnostic delays (DD) and to explore associated factors in a cohort of children with IBD in New Zealand. In this study, patients with IBD diagnosed as children and their parents/caregivers completed questionnaires on the patients’ medical history, diagnostic experience, and demographic characteristics. The parent/caregiver questionnaire also included the Barriers to Care Questionnaire (BCQ). Patients’ healthcare data was reviewed to summarise the history of clinical visits and determine symptoms. Total DD, healthcare DD, patient DD and parent DD were derived from the primary dataset. Factors associated with the different types of DD were explored with a series of simple linear and logistical ordinal regressions. A total of 36 patients (Crohn’s disease 25, ulcerative colitis 10; male 17) were included. They were diagnosed at a median age of 12 years (interquartile range (IQR) 10−15 years). Total healthcare delay (from first healthcare visit to formal diagnosis) was median (IQR) 15.4 (6.5−34.2) months. The median (IQR) specialist-associated delay was 4.5 (0−34) days. Higher household income was associated with shorter healthcare delay (p < 0.018), while lower overall BCQ scores (indicating more barriers experienced) were associated with longer total healthcare DD. Higher scores in each subscale of BCQ (Skills; Pragmatics; Expectations; Marginalization; Knowledge and Beliefs) were also significantly associated with shorter total healthcare delay (p < 0.04). This study found substantial diagnostic delays in paediatric patients with IBD and identified significant associations between longer total healthcare diagnostic delays and overall household income and higher self-reported barriers to accessing healthcare.

Commonly used biomarkers do not contribute to diagnosing irritable bowel syndrome

OBJECTIVE

The aim of this article was to examine the costs and effectiveness of standardized blood and fecal investigations in patients fulfilling the Rome criteria for irritable bowel syndrome (IBS).

METHODS

We conducted a real-life cohort study in patients fulfilling the Rome III criteria for IBS without red flag signs or symptoms, in a center of excellence for IBS patients from 1 January 2015 till 1 January 2019. Standardized blood and fecal investigations [hemoglobin (Hb), thyroid-stimulating hormone (TSH), coeliac serology, and fecal calprotectin (FCP)] were performed during the first consultation. Patients were followed for at least 1 year. Primary outcome was the probability of another diagnosis than IBS with subsequent overall costs.

RESULTS

A total of 218 patients were included. In approximately 200 patients blood and fecal investigations were performed and 47 patients underwent a colonoscopy. Two-hundred ten patients were diagnosed with IBS, 5 with inflammatory bowel disease (IBD), 1 with nonspecific acute ileitis, 1 with hyperthyroidism, and 1 with coeliac disease. The number needed to diagnose all included laboratory tests was 34, and for the individual test: TSH 197, coeliac serology 199, and FCP 50. The total costs were approximately €4900 to diagnose one patient with another diagnosis than IBS.

CONCLUSION

In our real-life cohort of adult patients under the age of 50 years fulfilling the Rome criteria for IBS without red flag symptoms, standardized blood, and fecal investigations have a very low diagnostic yield accompanied by high additional costs. Colonoscopy is not indicated in patients with Rome III positive IBS and normal FCP.

Changes in the clinical phenotype and behavior of pediatric luminal Crohn's disease at diagnosis in the last decade

BACKGROUND AND AIMS

The aims of this study were to describe the trends in the behavior of pediatric CD during the last decade and to describe the seasonal variation of disease presentation.

METHODS

Patients under 18 years old and diagnosed between 2009 and 2019 were included. The clinical, endoscopic, histological, and laboratory data were collected from the medical records. We analyzed the trends of these parameters according to the year and season of diagnosis.

RESULTS

654 patients were included in the study. The number of incident CD cases increased yearly. Patients diagnosed between 2015 and 2019 were younger at diagnosis (OR 2.53, p = 0.02), had more perianal diseases (OR: 2.30, p < 0.0001) and more granulomas (OR: 1.61, p = 0.003), but fewer eosinophils (OR: 0.35, p < 0.0001) and less chronic lymphoplasmacytic infiltrate (OR: 0.56, p = 0.008) as compared to the 2009-2014 cohort. There was fewer CD diagnosis during winter. Patients diagnosed in the fall had lower PCDAIs, less failure to thrive and less extensive digestive involvement. Colonic disease was significantly more frequent during summer and fall.

CONCLUSION

The clinical and histological phenotype of CD has changed over time and there are important seasonal trends in the frequency and severity on disease behavior suggesting possible disease triggers.

Benchmark of Data Processing Methods and Machine Learning Models for Gut Microbiome-Based Diagnosis of Inflammatory Bowel Disease

Patients with inflammatory bowel disease (IBD) wait months and undergo numerous invasive procedures between the initial appearance of symptoms and receiving a diagnosis. In order to reduce time until diagnosis and improve patient wellbeing, machine learning algorithms capable of diagnosing IBD from the gut microbiome's composition are currently being explored. To date, these models have had limited clinical application due to decreased performance when applied to a new cohort of patient samples. Various methods have been developed to analyze microbiome data which may improve the generalizability of machine learning IBD diagnostic tests. With an abundance of methods, there is a need to benchmark the performance and generalizability of various machine learning pipelines (from data processing to training a machine learning model) for microbiome-based IBD diagnostic tools. We collected fifteen 16S rRNA microbiome datasets (7,707 samples) from North America to benchmark combinations of gut microbiome features, data normalization and transformation methods, batch effect correction methods, and machine learning models. Pipeline generalizability to new cohorts of patients was evaluated with two binary classification metrics following leave-one-dataset-out cross (LODO) validation, where all samples from one study were left out of the training set and tested upon. We demonstrate that taxonomic features processed with a compositional transformation method and batch effect correction with the naive zero-centering method attain the best classification performance. In addition, machine learning models that identify non-linear decision boundaries between labels are more generalizable than those that are linearly constrained. Lastly, we illustrate the importance of generating a curated training dataset to ensure similar performance across patient demographics. These findings will help improve the generalizability of machine learning models as we move towards non-invasive diagnostic and disease management tools for patients with IBD.

Factors associated with time to clinical remission in pediatric luminal Crohn's disease: A retrospective cohort study

Background and Aim

Data on factors influencing time to remission in pediatric Crohn's disease (CD) are very limited in the literature. The aim of this retrospective cohort study was to describe the trends of time to clinical remission over the past decade and to identify factors associated with time to clinical remission in children with luminal CD.

Methods

Patients under 18 years old diagnosed between 2009 and 2019 were included. All data were collected from the patients' medical records. Survival analyses and linear regression models were used to assess the impact of clinical, laboratory, endoscopic, histological, and therapeutic factors on time to clinical remission.

Results

A total of 654 patients were included in the study. There was no change in the time to clinical remission over the decade. Female sex in adolescents (adjusted bêta regression coefficient [aβ] = 31.8 days, P = 0.02), upper digestive tract involvement (aβ = 46.4 days, P = 0.04) perianal disease (aβ = 32.2 days, P = 0.04), presence of active inflammation on biopsies at diagnosis (aβ = 46.7 days, P = 0.01) and oral 5‐aminosalicylates (5‐ASA) exposure (aβ = 56.6 days, P = 0.002) were associated with longer time to clinical remission. Antibiotic exposure (aβ = −29.3 days, P = 0.04), increased eosinophils (aβ = −29.6 days, P = 0.008) and combination of exclusive enteral nutrition with tumor‐necrosis‐factor‐alpha (TNF‐alpha) inhibitors as induction therapy (aβ = −36.8 days, P = 0.04) were associated with shorter time to clinical remission.

Conclusion

In children with newly diagnosed Crohn's disease, time to clinical remission did not shorten during the decade. It was associated with baseline clinical and histological data and treatment strategies. Combination of enteral nutrition and TNF‐alpha inhibitors was associated with faster clinical remission.

Association between autism spectrum disorder and inflammatory bowel disease: A systematic review and meta-analysis

Children with autism spectrum disorder (ASD) are frequently diagnosed with co-occurring medical conditions including inflammatory bowel disease (IBD). To investigate the association, we conducted a systematic review registered in PROSPERO (ID:CRD42021236263) with a random-effects meta-analysis. We searched PubMed, Embase, and PsycInfo (last search on January 25, 2021), and manually searched relevant publications. We included observational studies measuring the association between ASD and IBD. The primary outcome was the association (odds ratio, OR) between ASD and later development of IBD. Sensitivity analyses were conducted by quality, confounding adjustment, and study design. We performed meta-regression analyses and assessed heterogeneity, publication bias, and quality of studies with the Newcastle-Ottawa Scale. Overall, we included six studies consisting of eight datasets, including over 11 million participants. We found that ASD was significantly associated with subsequent incident IBD (any IBD, OR = 1.66, 95% confidence interval[CI] = 1.25-2.21, p < 0.001; ulcerative colitis, OR = 1.91, 95%CI = 1.41-2.6, p < 0.001; Crohn's disease, OR = 1.47, 95%CI = 1.15-1.88, p = 0.002). ASD and IBD were also associated regardless of temporal sequence of diagnosis (any IBD, OR = 1.57, 95%CI = 1.28-1.93, p < 0.001; ulcerative colitis, OR = 1.7, 95%CI = 1.36-2.12, p < 0.001; Crohn's disease, OR = 1.37, 95%CI = 1.12-1.69, p = 0.003). Sensitivity analyses confirmed the findings of the main analysis. Meta-regression did not identify any significant moderators. Publication bias was not detected. Quality was high in four datasets and medium in four. In conclusion, our findings highlight the need to screen for IBD in individuals with ASD, and future research should identify who, among those with ASD, has the highest risk of IBD, and elucidate the shared biological mechanisms between ASD and IBD.

Diagnostic Delay of Inflammatory Bowel Disease Is Significantly Higher in Public versus Private Health Care System in Mexican Patients

Introduction

Inflammatory bowel disease (IBD) includes ulcerative colitis (UC) and Crohn's disease (CD) characterized by a fluctuating course with periods of clinical activity and remission. No previous studies have demonstrated the frequency of delay at diagnosis and its associated factors in Mexico and Latin America. The aim of this study was to evaluate diagnostic delay of IBD in the last 4 decades in 2 different health care systems (public vs. private) and its associated factors.

Methods

This is a cohort study that included 1,056 patients with a confirmed diagnosis of IBD from public and private health care systems. The diagnostic delay was defined as time >1 year from the onset of symptoms to the confirmed diagnosis for patients with UC and 2 years for patients with CD. Statistical analysis was performed with the SPSS v.24 program. A value of p ≤ 0.05 was taken as significant.

Results

The delay at diagnosis decreased significantly by 24.9% in the last 4 decades. The factors associated with the diagnostic delay were proctitis in UC, clinical course >2 relapses per year and IBD surgeries for CD. We found a delay at diagnosis in 35.2% of IBD patients in the public versus 16.9% in the private health care system (p = 0.00001).

Conclusions

We found a significant diagnosis delay of IBD in 35.2% from the public health care system versus 16.9% in the private health care system.

Impact of diagnostic delay to the clinical presentation and associated factors in pediatric inflammatory bowel disease: a retrospective study

BACKGROUND

Undelayed diagnosis is thought to be a major determinant for good prognosis in pediatric inflammatory bowel disease (PIBD). However, factors predicting diagnostic delay and the consequences of this remain poorly defined. We investigated these issues in a well-defined cohort of PIBD patients.

METHODS

Comprehensive electronic data were collected from 136 PIBD patients retrospectively. Diagnostic delay was further classified into < 6 and ≥ 6 months, and < 12 and ≥ 12 months. Logistic regression was used to calculate whether the delay was associated with clinical features and/or risk of complications and co-morbidities at diagnosis.

RESULTS

The median age of patients was 12.4 years and 43.4% were females. Altogether 35.5% had Crohn´s disease (CD), 59.1% ulcerative colitis (UC) and 6.6% IBD undefined (IBD-U). The median delay before diagnosis was 5.0 months in all, 6.6 months in CD, 4.1 months in UC, and 9.8 months in IBD-U (UC vs. CD, p = 0.010). In all but IBD-U most of the delay occurred before tertiary center referral. Abdominal pain predicted a delay > 6 months in all PIBD (OR 2.07, 95% CI 1.00-4.31) and in UC patients (3.15, 1.14-8.7), while bloody stools predicted a shorter delay in all PIBD (0.28, 0.14-0.59) patients and in CD (0.10, 0.03-0.41) patients. A delay > 6 months was associated with a higher frequency of complications (2.28, 1.01-5.19).

CONCLUSIONS

Delay occurred mostly before specialist consultation, was longer in children presenting with abdominal pain and in CD and was associated with risk of complications. These findings emphasize the roles of active case-finding and prompt diagnostic evaluations.

Mental Health Factors Associated With Fatigue in Mexican Patients With Inflammatory Bowel Disease

GOALS

The aim of this study was to describe mental health factors associated with the development of fatigue in inflammatory bowel disease (IBD) patients.

BACKGROUND

IBD includes ulcerative colitis and Crohn's disease. Patients with chronic diseases can present fatigue differently and qualitatively more severely than those typically represented by healthy populations.

STUDY

This was a cross-sectional study in which 200 Mexican patients were attending the Inflammatory Bowel Disease Clinic at the National Institute of Medical Sciences and Nutrition. All patients answered 3 instruments: the first IBD-fatigue, HADS (Hospital Anxiety and Depression Scale), and PSQI (Pittsburgh Sleep Quality Index). The statistical analysis was carried out in the statistical program SPSS v 24.

RESULTS

The percentage of fatigue in our patients was 55.5% (n=111) for mild-moderate fatigue, 31.5% (n=63) for severe fatigue, and only 13% (n=26) had no fatigue. Sleep disturbance and sleep latency were the most important predictors of fatigue in IBD patients.

CONCLUSIONS

Sleep quality and depression have an impact on fatigue in Mexican patients with IBD. It is important for multidisciplinary management to reduce these symptoms and improve the quality of life of patients with IBD.

The Impact of a Standardized Pre-visit Laboratory Testing Panel in the Internal Medicine Outpatient Clinic: a Controlled "On-Off" Trial

BACKGROUND

In several settings, a shorter time to diagnosis has been shown to lead to improved clinical outcomes. The implementation of a rapid laboratory testing allows for a pre-visit testing in the outpatient clinic, meaning that test results are available during the first outpatient visit.

OBJECTIVE

To determine whether the pre-visit laboratory testing leads to a shorter time to diagnosis in the general internal medicine outpatient clinic.

DESIGN

An "on-off" trial, allocating subjects to one of two treatment arms in consecutive alternating blocks.

PARTICIPANTS

All new referrals to the internal medicine outpatient clinic of a university hospital were included, excluding second opinions. A total of 595 patients were eligible; one person declined to participate, leaving data from 594 patients for analysis.

INTERVENTION

In the intervention group, patients had a standardized pre-visit laboratory testing before the first visit.

MAIN MEASURES

The primary outcome was the time to diagnosis. Secondary outcomes were the correctness of the preliminary diagnosis on the first day, health care utilization, and patient and physician satisfaction.

KEY RESULTS

There was no difference in time to diagnosis between the two groups (median 35 days vs 35 days; hazard ratio 1.03 [0.87-1.22]; p = .71). The pre-visit testing group had higher proportions of both correct preliminary diagnoses on day 1 (24% vs 14%; p = .003) and diagnostic workups being completed on day 1 (10% vs 3%; p < .001). The intervention group had more laboratory tests done (50.0 [interquartile range (IQR) 39.0-69.0] vs 43.0 [IQR 31.0-68.5]; p < .001). Otherwise, there were no differences between the groups.

CONCLUSIONS

Pre-visit testing did not lead to a shorter overall time to diagnosis. However, a greater proportion of patients had a correct diagnosis on the first day. Further studies should focus on customizing pre-visit laboratory panels, to improve their efficacy.

TRIAL REGISTRATION

NL5009.

Wireless Capsule Endoscopy for Diagnosis and Management of Post-Operative Recurrence of Crohn's Disease

Despite aggressive medical therapy, many patients with Crohn's disease require surgical intervention over time. After surgical resection, disease recurrence is common. Ileo-colonoscopy and the Rutgeerts score are commonly used for diagnosis and monitoring of post-operative endoscopic recurrence. The latter is the precursor of clinical recurrence and therefore it impacts prognosis and patient management. However, due to the limited length of bowel assessed by ileo-colonoscopy, this procedure can miss out-of-reach, more proximal lesions in the small bowel. This limitation introduces an important uncertainty when evaluating post-operative relapse by ileo-colonoscopy. In addition, the Rutgeerts score 'per se' bears a number of ambiguities. Here we will discuss the pros and cons of ileo-colonoscopy and other imaging studies including wireless capsule endoscopy to diagnose and manage post-operative recurrence of Crohn's disease. A number of studies provide evidence that wireless capsule endoscopy is a potentially more accurate as well as less invasive and less costly alternative to conventional techniques including ileo-colonoscopy.

The Value of Obtaining Colonic Mucosal Biopsies of Grossly Normal Tissue in Pediatric Patients

OBJECTIVES

Current practice during pediatric colonoscopy is to obtain random colonic biopsies, even from normal appearing tissue. The majority of literature published on colonic biopsy practice analyzes adults; however, limited data examines the pediatric population. The lack of standardization regarding tissue sampling during pediatric colonoscopy reinforces the necessity to study this question objectively. The aim of the present study was to assess the value of obtaining mucosal biopsies from grossly normal colonic tissue.

METHODS

A retrospective study was performed to examine the utility of obtaining colonic biopsies from normal appearing tissue. Subjects included patients who underwent colonoscopy during a 2-year period. Descriptive analyses and logistic regression models were used to determine endoscopic and histologic agreement and to characterize predictors of agreement.

RESULTS

The predictive value of agreement between normal appearing colonoscopies (n = 237) and histopathology was 81%. Excluding patients with inflammatory bowel disease (IBD) increased the predictive value to 85%. Two and a half percent of grossly normal colonoscopies had histological findings consistent with newly diagnosed IBD. Predictors of normal histology included abdominal pain (odds ratio [OR] 3.68, 95% CI 1.84-7.37), whereas a known diagnosis of IBD was predictive of abnormal histology (OR 0.22, 95% CI 0.08-0.67). Among the full sample, elevated inflammatory markers (OR 2.02, 95% CI 1.06-3.86) or fatigue (OR 2.60, 95% CI 1.13-5.94) were predictive of abnormal histology.

CONCLUSIONS

Results suggest that colonic biopsies may not need to be routinely obtained from all pediatric colonoscopies, particularly in those patients with complaints of abdominal pain. Biopsies should continue to be obtained from patients with a known diagnosis of IBD, elevated inflammatory markers, or fatigue. Further studies are needed to standardize protocols for biopsy practice in pediatric colonoscopy.

Association of diagnostic delay with medical cost for patients with Crohn's disease: A Japanese claims-based cohort study

Background and Aim

Longer diagnostic delay (DD) in Crohn's disease (CD) is associated with complications and related surgeries. However, the impact of DD on medical cost after CD diagnosis remains uncertain.

Methods

This was a claims‐based cohort study. Our analysis used data from 2005 to 2018 from the Japanese Claims Database. We enrolled a total of 528 newly diagnosed CD patients (76.9% male) aged 31.5 ± 13.6 years. High medical cost was defined as the highest quartile of the average monthly medical cost. DD was defined as the interval between the first visit to a gastroenterologist and diagnosis with CD. In the multivariable logistic regression analysis, patients were stratified by the use of anti‐tumor necrosis factor alpha (anti‐TNFα) agents to exclude their influence on the observed effects. This study was approved by the ethics review board of the Juntendo University Faculty of Medicine (No. 2019178).

Results

The multivariable‐adjusted odds ratios and 95% confidence intervals of high medical cost were 1.41 (0.81–2.43) and 0.91 (0.57–1.46), respectively, for a DD of >12 months and 1 to ≤12 months compared to <1 month. In patients receiving anti‐TNFα agents, the multivariable‐adjusted odds ratios for high medical cost were 2.63 (1.34–5.16) and 1.35 (0.79–2.28) for a DD of >12 months and 1 to ≤12 months, respectively, compared to <1 month. In patients without anti‐TNFα, multivariable logistic regression analyses were not presented because of a small number of patients categorized into the high medical cost group.

Conclusion

A delayed diagnosis of CD may incur high medical cost in patients who develop aggressive disease that requires treatment with anti‐TNFα agents.

Extracellular Vesicles in Inflammatory Bowel Disease: Small Particles, Big Players

Extracellular vesicles are nanovesicles released by many cell types into the extracellular space. They are important mediators of intercellular communication, enabling the functional transfer of molecules from one cell to another. Moreover, their molecular composition reflects the physiological status of the producing cell and tissue. Consequently, these vesicles have been involved in many [patho]physiological processes such as immunomodulation and intestinal epithelial repair, both key processes involved in inflammatory bowel disease. Given that these vesicles are present in many body fluids, they also provide opportunities for diagnostic, prognostic, and therapeutic applications. In this review, we summarise functional roles of extracellular vesicles in health and disease, with a focus on immune regulation and intestinal barrier integrity, and review recent studies on extracellular vesicles and inflammatory bowel disease. We also elaborate on their clinical potential in inflammatory bowel disease.