Double-blinded randomised placebo controlled trial of enterosgel (polymethylsiloxane polyhydrate) for the treatment of IBS with diarrhoea (IBS-D)

Randomised feasibility study of an intestinal adsorbent in acute diarrhoea in The Gambia

BACKGROUND

Diarrhoea remains a leading cause of death in children. An intestinal adsorbent may reduce diarrhoea duration and severity.

METHODS

Randomised controlled feasibility trial with two phases: phase 1 (0-4 hours and double-blind) and phase 2 (up to 5 days and open-label). 50 children aged 6-59 months with acute diarrhoea presenting with no or some dehydration to the emergency paediatric unit and outpatient clinic at Edward Francis Small Teaching Hospital, Banjul, The Gambia were randomised to either standard treatment (oral rehydration fluid and zinc) or standard treatment with polymethylsiloxane polyhydrate for up to 5 days.

RESULTS

Recruitment was completed in 7 months. All but one child completed the study. There were no major protocol deviations although patient-held diaries did not collect reliable information. Time from randomisation to the last watery stool (primary outcome) was shorter in the intervention than control arm (mean difference -19.3 hours, 95% CI -30.9 to -7.8). Stool frequency was lower in the intervention arm on days 2 (95% CI -0.8 to -1.3 to -0.3) and 3 (95% CI -0.8; -1.3 to -0.3). One serious event (death) occurred in the control arm.

CONCLUSIONS

A randomised, controlled trial is feasible. Further clinical trials are warranted to confirm the efficacy of polymethylsiloxane polyhydrate in acute diarrhoea and inform management guidelines.

TRIAL REGISTRATION NUMBER

PACTR202302683128875.

Non-pharmaceutical treatments for irritable bowel syndrome

Irritable bowel syndrome (IBS) is a chronic disorder of gut-brain interaction that impacts a significant portion of the population and is associated with substantial morbidity, reduced quality of life, and economic impact globally. The pathophysiology of IBS is complex and incompletely understood, and the heterogeneity of IBS is reflected in the variety of pharmaceutical and non-pharmaceutical therapies utilized for the management of IBS. Given limitations with pharmaceutical treatments, many patients with IBS seek non-pharmaceutical options. Several non-pharmaceutical treatments such as the low FODMAP diet and brain-gut behavior interventions such as gut directed hypnosis and cognitive behavioral therapy are now considered standard of care and are part of all major guidelines for the treatment of IBS. However, challenges with access to and optimal implementation of these therapies remain. This review focuses on the current evidence for common non-pharmaceutical treatments for IBS, including the latest advances in dietary and brain-gut behavioral care, in addition other complementary and integrative health practices and emerging therapies.

Personalisation of therapy in irritable bowel syndrome: a hypothesis

Irritable bowel syndrome (IBS) is a common disorder of gut-brain interaction characterised by symptoms of abdominal pain, occurring at least 1 day per week, and a change in stool frequency or form. Individuals with IBS are usually subtyped according to their predominant bowel habit, which is used to direct symptom-based treatment. However, this approach is probably an oversimplification of a complex and multidimensional condition, and other factors, such as psychological health, are known to influence symptom severity and prognosis. We have previously used latent class analysis, a method of mathematical modelling, to show that people with IBS can be classified into seven unique clusters based on a combination of gastrointestinal symptoms, abdominal pain, extraintestinal symptoms, and psychological comorbidity. The clusters can be used to predict the prognosis of IBS (eg, symptom severity), health-care use (eg, consultation behaviour, prescribing, and costs), and impact (eg, quality of life, work and productivity, activities of daily living, and income). These clusters could also be used to increase the personalisation of IBS treatment that better recognises the heterogenous nature of the condition. We present new data providing additional validation of our seven-cluster model and conduct a comprehensive evidence-based review of IBS management. Based on this evidence, we propose a framework of first-line and second-line treatments according to IBS cluster. Finally, we discuss what further research is needed to implement this approach in clinical practice, including the need for randomised trials comparing cluster-based treatment with conventional treatment according to stool subtype.

Efficacy of acupuncture treatment for diarrhea-predominant irritable bowel syndrome with comorbid anxiety and depression: A meta-analysis and systematic review

BACKGROUND

Presently, a diverse range of Western medical interventions are accessible for the management of irritable bowel syndrome with diarrhea (IBS-D) concomitant with comorbid anxiety and depression. However, the concomitant adverse effects have also surfaced, exerting strain on healthcare resources and the socio-economic structure. In recent times, the benefits of acupuncture in the management of IBS-D with coexisting anxiety and depression have become progressively evident. Nevertheless, a paucity of evidence-based medicine exists to substantiate the utilization of acupuncture for the treatment of IBS-D with anxiety and depression. The objective of this study is to examine the effectiveness of acupuncture as an intervention for IBS-D with comorbid anxiety and depression.

METHODS

We searched 7 databases, including the Chinese Journal Full-text Database, Wanfang Academic Journals Full-text Database, VIP Chinese Scientific Journals Full-text Database, China Biomedical Literature Database, PubMed, Embase, and Cochrane Library, for randomized controlled trials (RCTs) related to acupuncture treatment for IBS with anxiety and depression, published from database inception to August 1, 2023. RevMan 5.4 and Stata 17.0 software were used for meta-analysis of relevant outcome measures.

RESULTS

This study included a total of 16 RCTs, involving 1305 IBS-D patients (691 in the experimental group and 614 in the control group). The meta-analysis results showed that compared to oral medication, acupuncture therapy improved HAMD scores (MD = 0.88, 95% CI = [0.68, 1.07], P < .00001), HAMA scores (MD = 2.32, 95% CI = [1.70, 2.93], P < .00001), self-rating anxiety scale scores (MD = 11.67, 95% CI = [10.85, 12.49], P < .00001), SDS scores (MD = 9.84, 95% CI = [8.52, 11.16], P < .00001), IBS-SSS scores (MD = 37.48, 95% CI = [12.17, 62.78], P = .004), overall response rate (MD = 1.27, 95% CI = [1.20, 1.35], P < .00001), and relapse rate (MD = 0.27, 95% CI = [0.16, 0.47], P < .00001) in patients with IBS-D comorbid with anxiety and depression.

CONCLUSION

Acupuncture treatment has a definite and beneficial effect on IBS-D patients with comorbid anxiety and depression.

[The proven and the new in the pharmacotherapy of irritable bowel syndrome]

Irritable bowel syndrome (IBS) is a chronic disease of the digestive tract that is characterised by decades-long chronicity. At the same time, it is particularly challenging to treat since successful treatment often requires a combination of pharmacological and non-pharmacological measures. The pathomechanisms of IBS have only just started to be elucidated, meaning that causally effective treatments are largely lacking. In contrast to earlier notions of a "psychosomatic disorder", IBS is an organic disease in the vast majority of cases. The predominant symptoms are usually intestinal cramps or abdominal pain, meteorism/flatulence, constipation, and diarrhea. The patient should be fully included in a joint treatment concept from the outset. Given the lack of causal treatment methods, each treatment approach is initially by way of trial; if there is no effect, treatment should be discontinued after 3 months at the latest. Effective treatments can be continued, adapted, and/or combined with other procedures as an on-demand or permanent treatment. Supplementing the targeted drug treatment of the dominant individual symptoms with somewhat unspecific but often relevantly effective basic or accompanying treatments has proven useful. Such a multimodal treatment strategy, in which general measures as well as nutritional, psychological, and pharmacotherapies are individually combined, is significantly superior to drug monotherapy. This article describes first- and second-line drug treatments in addition to options for refractory symptoms. The choice of drug therapy is primarily determined by the dominant symptoms. Depending on the symptom constellation, it may be beneficial to combine different drugs.

Navigating the complexities of drug development for inflammatory bowel disease

Inflammatory bowel disease (IBD) - consisting of ulcerative colitis and Crohn's disease - is a complex, heterogeneous, immune-mediated inflammatory condition with a multifactorial aetiopathogenesis. Despite therapeutic advances in this arena, a ceiling effect has been reached with both single-agent monoclonal antibodies and advanced small molecules. Therefore, there is a need to identify novel targets, and the development of companion biomarkers to select responders is vital. In this Perspective, we examine how advances in machine learning and tissue engineering could be used at the preclinical stage where attrition rates are high. For novel agents reaching clinical trials, we explore factors decelerating progression, particularly the decline in IBD trial recruitment, and assess how innovative approaches such as reconfiguring trial designs, harmonizing end points and incorporating digital technologies into clinical trials can address this. Harnessing opportunities at each stage of the drug development process may allow for incremental gains towards more effective therapies.

Chitin-glucan improves important pathophysiological features of irritable bowel syndrome

BACKGROUND

Irritable bowel syndrome (IBS) is one of the most frequent and debilitating conditions leading to gastroenterological referrals. However, recommended treatments remain limited, yielding only limited therapeutic gains. Chitin-glucan (CG) is a novel dietary prebiotic classically used in humans at a dosage of 1.5-3.0 g/d and is considered a safe food ingredient by the European Food Safety Authority. To provide an alternative approach to managing patients with IBS, we performed preclinical molecular, cellular, and animal studies to evaluate the role of chitin-glucan in the main pathophysiological mechanisms involved in IBS.

AIM

To evaluate the roles of CG in visceral analgesia, intestinal inflammation, barrier function, and to develop computational molecular models.

METHODS

Visceral pain was recorded through colorectal distension (CRD) in a model of long-lasting colon hypersensitivity induced by an intra-rectal administration of TNBS [15 milligrams (mg)/kilogram (kg)] in 33 Sprague-Dawley rats. Intracolonic pressure was regularly assessed during the 9 wk-experiment (weeks 0, 3, 5, and 7) in animals receiving CG (n = 14) at a human equivalent dose (HED) of 1.5 g/d or 3.0 g/d and compared to negative control (tap water, n = 11) and positive control (phloroglucinol at 1.5 g/d HED, n = 8) groups. The anti-inflammatory effect of CG was evaluated using clinical and histological scores in 30 C57bl6 male mice with colitis induced by dextran sodium sulfate (DSS) administered in their drinking water during 14 d. HT-29 cells under basal conditions and after stimulation with lipopolysaccharide (LPS) were treated with CG to evaluate changes in pathways related to analgesia (µ-opioid receptor (MOR), cannabinoid receptor 2 (CB2), peroxisome proliferator-activated receptor alpha, inflammation [interleukin (IL)-10, IL-1b, and IL-8] and barrier function [mucin 2-5AC, claudin-2, zonula occludens (ZO)-1, ZO-2] using the real-time PCR method. Molecular modelling of CG, LPS, lipoteichoic acid (LTA), and phospholipomannan (PLM) was developed, and the ability of CG to chelate microbial pathogenic lipids was evaluated by docking and molecular dynamics simulations. Data were expressed as the mean ± SEM.

RESULTS

Daily CG orally-administered to rats or mice was well tolerated without including diarrhea, visceral hypersensitivity, or inflammation, as evaluated at histological and molecular levels. In a model of CRD, CG at a dosage of 3 g/d HED significantly decreased visceral pain perception by 14% after 2 wk of administration (P < 0.01) and reduced inflammation intensity by 50%, resulting in complete regeneration of the colonic mucosa in mice with DSS-induced colitis. To better reproduce the characteristics of visceral pain in patients with IBS, we then measured the therapeutic impact of CG in rats with TNBS-induced inflammation to long-lasting visceral hypersensitivity. CG at a dosage of 1.5 g/d HED decreased visceral pain perception by 20% five weeks after colitis induction (P < 0.01). When the CG dosage was increased to 3.0 g/d HED, this analgesic effect surpassed that of the spasmolytic agent phloroglucinol, manifesting more rapidly within 3 wk and leading to a 50% inhibition of pain perception (P < 0.0001). The underlying molecular mechanisms contributing to these analgesic and anti-inflammatory effects of CG involved, at least in part, a significant induction of MOR, CB2 receptor, and IL-10, as well as a significant decrease in pro-inflammatory cytokines IL-1b and IL-8. CG also significantly upregulated barrier-related genes including muc5AC, claudin-2, and ZO-2. Molecular modelling of CG revealed a new property of the molecule as a chelator of microbial pathogenic lipids, sequestering gram-negative LPS and gram-positive LTA bacterial toxins, as well as PLM in fungi at the lowesr energy conformations.

CONCLUSION

CG decreased visceral perception and intestinal inflammation through master gene regulation and direct binding of microbial products, suggesting that CG may constitute a new therapeutic strategy for patients with IBS or IBS-like symptoms.

Different acupuncture and moxibustion therapies in the treatment of IBS-D with anxiety and depression: A network meta-analysis

BACKGROUND

Currently, a variety of Western medical interventions are available for the treatment of diarrhea-predominant irritable bowel syndrome (IBS-D) with comorbid anxiety and depression. However, the attendant negative effects also emerge, putting pressure on healthcare resources and socio-economic structures. In recent years, the benefits of acupuncture (ACU) and moxibustion in the treatment of IBS-D with anxiety and depression have gradually emerged. However, there are many types of ACU-moxibustion-related treatments, and the aim of this study is to examine the effectiveness of different ACU-moxibustion therapies in the treatment of anxiety and depression in IBS-D patients.

METHODS

Searched and identified randomized controlled trials (RCTS) of ACU for the treatment of anxiety and depression in patients with irritable bowel syndrome (IBS). The search spanned from the establishment of the database until September 1, 2023. Revman 5.4 and Stata 15.0 software were used for network meta-analysis (NMA), and the included interventions were ranked by the area under the cumulative ranking curve.

RESULTS

A total of 26 articles involving 8 interventions were included. In terms of improving HAMA score, MOX was superior to EA, combined therapies, CH, WM and placebo; In terms of improving HAMD score, MOX was superior to ACU, EA, combined therapies, WM and placebo; In terms of improving the SAS score, The combined therapies were superior to EA, CH and WM; In terms of improving SDS scores, The combined therapies were superior to EA, CH and WM; In terms of improving IBS-SSS score, The combined therapies were superior to WM; In terms of reducing recurrence rates, CH was superior to combined therapies; In terms of improving total effective rates, MOX was superior to EA, CH, WM and placebo; MOX, combined therapies, ACU and EA ranked higher in SUCRA of different outcome indicators.

CONCLUSION

MOX, combined therapies, ACU and EA have certain curative effect on anxiety and depression in patients with IBS-D, and their safety is high. ACU and MOX combined with other therapies also have significant advantages in the treatment effect.

Efficacy of the Enteroadsorbent Silicol®gel in Adults with Irritable Bowel Syndrome Subtypes IBS-D or Mixed: Observational Open-Label Study

Background

Irritable bowel syndrome (IBS) is a common chronic gut-brain interaction disorder with limited effective treatment options. Intestinal adsorbents have a high adsorption capacity for gut irritants and may provide nonpharmacological alternatives.

Objectives

This post marketing study is aimed at providing up-to-date evidence to support the safety and efficacy in normal use of an established medical device for IBS treatment.

Methods

In this open-label, observational study, adults with IBS with predominant diarrhoea (IBS-D) or IBS with mixed bowel habits (IBS-M), according to Rome IV criteria, received 4 weeks of treatment with the enteroadsorbent Silicol®gel, a CE-certified, licenced, medical device containing colloidal silicic acid. Eligible participants were assessed at baseline (visit 1; in-clinic) and after 1 (visit 2; telephone), 2 (visit 3; telephone), and 4 (visit 4; in-clinic) weeks of treatment. The primary endpoint was the proportion of participants with an overall reduction in the IBS severity scoring system (IBS SSS) > 50, representing clinically meaningful improvement. Key secondary endpoints were a reduction in common IBS symptoms and improved quality of life (QoL).

Results

Among the 67 treated participants (IBS-D: 37; IBS-M: 30), 65 completed the study. At visit 4, 83.6% (56/67) of participants achieved a reduction in IBS SSS > 50. The mean (standard deviation [SD]) IBS SSS was 323.4 (55.7) at visit 1 and 160.3 (90.3) at visit 4 (overall change: -163.1 (101.7); 95% confidence interval [CI] 138.3, 187.9, p < 0.001). Compared with visit 1, significant reductions in the severity of all key IBS symptoms and overall improvement in QoL were observed at visit 4 (p < 0.001), with improvements observed from visits 1 and 2.

Conclusions

In this open-label study of participants with IBS-D and IBS-M, Silicol®gel provided clinically significant improvement in IBS symptoms, demonstrating that enteroadsorbents may be clinically beneficial in this population.

The future of clinical trials-is it virtual?

INTRODUCTION

Participant recruitment to clinical trials is often sub-optimal. Decentralized clinical trials have the potential to address challenges in traditional site-based clinical trial recruitment.

SOURCES OF DATA

This review is based on recently published literature and the experience of running a large industry-sponsored interventional trial using both traditional and decentralized methods.

AREAS OF AGREEMENT

Efficient delivery of clinical trials is essential to continue to provide therapeutic improvements in a timely and cost-efficient way. Clinical trial designs are constantly evolving to achieve effective trial delivery, manage the complexity of new therapeutic algorithms and conform to cultural developments.

AREAS OF CONTROVERSY

Digitally innovative decentralized clinical trials may be a solution to improve recruitment and retention. Although many trials incorporate digital innovations to reduce patient burden, decentralized clinical trials allow remote access to clinical research, potentially enhancing geographical diversity as well as reducing participant burden.

GROWING POINTS

Areas for development currently being discussed are developing a 'recruitment platform' that exploits the reach of digital connectivity, automated identification of eligible participants from volunteers, employing technology for remote interaction and exploring the logistic process of delivering the interventions.

AREAS TIMELY FOR RELEVANT RESEARCH

The focus of development must ensure that the overall impact will widen participation and reduce inequalities in healthcare.

Leveraging Virtual Technology to Conduct Clinical Trials in Inflammatory Bowel Disease

Clinical trials have led to major advances in inflammatory bowel disease (IBD) care over the last few decades, yet in that time most clinical trial protocols in IBD have remained markedly the same. Many IBD protocols often still require face-to-face visits and monitoring, hospital-based medication administration, paper-based forms and questionnaires, and short follow-up periods resulting in limited long-term data. These factors have recently been recognized as likely contributors to the low recruitment and lack of diversity of participants across clinical trials in IBD. However, with increasing technological advances, there is now an opportunity for improvement. This article assesses a range of virtual innovations for how they may offer digital solutions to challenges currently encountered in IBD clinical trials. Such solutions include consideration for increasing patient diversity, digital invitation, remote consent and recruitment, virtual visits, remote patient monitoring and data collection, remote medication delivery and administration, remote clinical trial monitoring, and routinely collected health data for long-term follow-up. Adoption of virtual technology may drive the field toward patient centricity and more efficient trial protocols to allow for a new era in IBD clinical trials.

Managing pain in irritable bowel syndrome: current perspectives and best practice

INTRODUCTION

Irritable bowel syndrome (IBS) is characterized by chronic symptoms (>6 months) of abdominal pain in combination with a disturbed bowel habit. There is an association between the intensity of abdominal pain and the need for health care utilization. A bidirectionally disordered gut-brain interaction is central in the pathophysiology of IBS where a number of factors, gastrointestinal and non-gastrointestinal, can contribute to the illness experience. In order to treat abdominal pain in IBS, mapping these factors in a multidimensional clinical profile is helpful.

AREAS COVERED

This review covers basic epidemiology and pathophysiology of abdominal pain in IBS, the diagnostic approach, and a multidimensional treatment model where the management of abdominal pain is in focus.

EXPERT OPINION

A personalized treatment of abdominal pain in IBS is possible in patients who understand the diagnosis, the potential of therapies used, and where a good continuity in the patient-doctor relationship is established.

Update on treatment of abdominal pain in irritable bowel syndrome: A narrative review

The objectives of this narrative review are to update readers on the current state-of-the-art regarding diverse approaches for the treatment of pain, global symptoms, or adequate relief in irritable bowel syndrome (IBS). The article appraises medications, dietary interventions including low fermentable oligosaccharides, disaccharides, and monosaccharides and polyols (FODMAP) diet, fecal microbial transplantation (FMT), electrical approaches, and behavioral therapies including cognitive behavioral therapy (CBT), gut-directed hypnotherapy (GDH), mindfulness, and open-label placebo. Current evidence demonstrates only modest benefit in global IBS symptoms and pain relief. A future approach that identifies pathophysiological mechanisms of IBS through validated biomarkers has the potential to individualize treatment of patients rather than sequential therapeutic trial and error approaches.