Approach to Disorders of Gut-Brain Interaction

Review Article: Individualised Management of Reflux-Like Symptoms-Strategies Beyond Acid Suppression

BACKGROUND

Reflux-like symptoms and reflux oesophagitis are often perceived as having the same acid-related aetiology and responsiveness to antisecretory therapy. However, the frequency of residual symptom reporting on proton pump inhibitor (PPI) therapy suggests the two entities have some differential pathophysiological determinants requiring distinct management approaches.

AIMS

To examine the complexities of reflux-like symptom pathophysiology and strategies that may be used to target contributing factors beyond acid reflux.

METHODS

A panel of ten expert clinicians (primary care, gastroenterology and psychology) held a series of online meetings to share perspectives on the underlying contributors to, and management of, reflux-like symptoms when PPIs are ineffective or provide partial relief. This review summarises the agreed key themes that emerged from the expert discussions.

RESULTS

While degradation of the anti-reflux barrier dominates in reflux oesophagitis, cognitive-affective, behavioural, and other psychosocial factors can play a major role in symptom persistence. These require individualised management strategies, beginning with education on the gut-brain connection and expectation setting with regard to PPI therapy. A detailed clinical history and patient-reported outcome tools that measure symptom burden and associated anxiety/hypervigilance can help guide management using brain-gut behavioural therapies, supported diet/lifestyle modification, diaphragmatic breathing, weight loss, and/or on-demand symptom control measures according to a patient's specific needs.

CONCLUSIONS

A paradigm shift in reflux-like symptom management is required such that acid suppression is viewed as one of several interventions that can be utilised as part of a phenotype-driven, individualised approach to care that acknowledges the multiple contributors to symptom burden.

Neurogastroenterology: The Cinderella among the ecological niches of gastroenterology?

Neurogastroenterology (NGE) refers to a specific sub-specialty of gastroenterology that investigates the pathophysiology, diagnostics and therapeutic approaches to the "disorders of gut-brain interaction" (DGBIs), frequently encountered in clinical practice and often associated with poor quality of life and high healthcare costs. Two recent national surveys, focused on common DGBIs, highlighted two main issues. Despite the high incidence of DGBIs there is a lack of awareness and appropriate training to effectively treat these conditions and a lack of specific referral centers in each region. Indeed, specific training and a multidisciplinary approach are required to properly manage these patients, but these are not always available. As a result, NGE lacks attractiveness for many young gastroenterologists. We believe that NGE has great potential to emerge among the various sub-branches of gastroenterology. However, its growth is limited by lack of specific training, knowledge, accessibility, diagnostic capabilities, multidisciplinary integration, and financial investments in research. To bridge this gap, it would be helpful to overcome these limits through an increase in specific training concerning DGBIs among students, residents, physicians and general practitioners. This, coupled with improved access to advanced diagnostic tests, innovative therapies, and a better multidisciplinary approach, could help expand the knowledge in this still niche area and achieve better treatment outcomes for patients.

Bilingual Perspectives of Functional Dyspepsia Management in People From Underserved Areas

INTRODUCTION

Disorders of gut-brain interaction, such as functional dyspepsia (FD), are prevalent and challenging conditions. In other gastrointestinal (GI) disorders, individuals from underserved areas (UAs) have difficulty accessing care. Little is known about UA FD patient perspectives of their care, especially in those with limited English proficiency. We aimed to characterize patients' experiences with FD management with the goal of informing future studies targeting disorders of gut-brain interaction management in potentially vulnerable communities residing in UAs.

METHODS

Participants meeting FD criteria were identified in 2 community health centers affiliated with a large academic medical center in the Northeastern United States. Semistructured interviews were conducted in English and Spanish. Transcripts were reviewed by a bilingual panel of investigators using the constant comparative method of iterative data acquisition. Psychosocial stressors and GI symptom severity were assessed.

RESULTS

A total of 26 participants were interviewed (12 English-speaking and 14 Spanish-speaking). Broadly, GI symptoms were mild and there was mild-to-moderate psychological distress present. Adverse social determinants of health were highly prevalent. Despite mild symptom severity on objective scales, FD severely affected quality of life and interfered with physical, psychological, and social well-being, including avoidance of certain foods and professional/social situations. Study participants (particularly those with limited English proficiency status) reported difficulty in receiving care. Thematic saturation was achieved.

DISCUSSION

Even when symptoms were mild, interviewees from UAs reported significant FD-related impairment, along with psychological distress. Education interventions targeting FD-related care in UAs should be designed to improve shared decision making in FD, sensitive to the burden of social determinants of health.

Unveiling the efficacy of paroxetine and gabapentin in ulcerative colitis patients in remission with co-existing IBS-like symptoms: a single-blinded randomized clinical trial

Introduction

This clinical trial is designed to explore the efficacy of paroxetine and gabapentin in alleviating functional gastrointestinal symptoms, anxiety, depression, and quality of life in patients with ulcerative colitis during the remission stage.

Methods

The study enrolled 97 patients with ulcerative colitis in remission who had reported functional gastrointestinal symptoms. Patients were measured in terms of quality of life, anxiety, depression, and IBS severity. One group received paroxetine at a dosage of 20 mg/day, and the other group received gabapentin at a dosage of 100 mg/day in the first month and 300 mg/day in the second and third months. The patients were followed up for 3 months.

Results

Anxiety (p < 0.001), depression (p = 0.012), and severity score levels (p = 0.045) among patients in the paroxetine group were significantly lower compared to the gabapentin group following the intervention. Paired evaluation in each treatment group revealed a significant reduction in the paroxetine group, while changes in the gabapentin group were not significant. Quality-of-life scores among patients in the paroxetine group were significantly higher compared to the gabapentin group following the intervention (p < 0.001).

Conclusion

The rate of improvement in gastrointestinal functional symptoms, anxiety, depression, and quality of life is significantly superior with paroxetine compared to gabapentin.

Clinical trial registration

https://irct.behdasht.gov.ir/trial/69397, identifier RCT20220417054557N1.

Short- and long-term reproducibility of body surface gastric mapping using the Gastric Alimetry® system

BACKGROUND

Many diagnostic tests for gastroduodenal symptoms, such as gastric emptying scintigraphy (GES), gastric emptying breath tests (GEBT), and electrogastrography (EGG) show variable intra-individual reproducibility over time. This study investigated the short- and long-term reproducibility of body surface gastric mapping (BSGM), a non-invasive test for assessing gastric function, in controls and patients with chronic gastroduodenal disorders.

METHODS

Participants completed three standardized BSGM tests using Gastric Alimetry® (Alimetry, New Zealand). The test encompassed a fasting baseline (30 min), a 482 kCal standard meal, and a 4 h postprandial recording. The first two tests were >6 months apart and the last occurred ~1 week after the second test, to evaluate long and short-term reproducibility.

RESULTS

Fourteen patients with upper gastrointestinal symptoms and 14 healthy controls were recruited. There were no significant differences in any BSGM metrics between the tests at short and long term (all p > 0.180). Lin's concordance correlation coefficients (CCC) for the primary metrics were high, ranging from 0.58 to 0.96, with intra-individual coefficients of variance (CVintra) ranging from 0.2% to 1.9%. Reproducibility was higher, and intra-individual variation lower, than in previous studies of GES (CCC = 0.54-0.83, CVintra = 3%-77%), GEBT (CVintra = 8%-11%), and EGG (CVintra = 3%-78%).

CONCLUSIONS

BSGM spectral metrics demonstrate high reproducibility and low intra-individual variation at both short and long term, with superior results to comparable tests. The high reproducibility of Gastric Alimetry supports its role as a diagnostic aid for gastric dysfunction and a reliable tool for evaluating treatment outcomes and disease progression over time.

Clostridioides difficile infection promotes gastrointestinal dysfunction in human and mice post-acute phase of the disease

OBJECTIVES

In the US, Clostridioides difficile (C. difficile) infection (CDI) is the 8th leading cause of hospital readmission and 7th for mortality among all gastrointestinal (GI) disorders. Here, we investigated GI dysfunction post-CDI in humans and mice post-acute infection.

MATERIALS AND METHODS

From March 2020 to July 2021, we reviewed the clinical records of 67 patients referred to the UVA Complicated C. difficile clinic for fecal microbiota transplantation (FMT) eligibility. C57BL/6 mice were infected with C. difficile and clinical scores were determined daily. Stool samples from mice were collected to measure the shedding of C. difficile and myeloperoxidase (MPO) levels. On day 21 post-infection, Evans's blue and FITC-70kDa methods were performed to evaluate GI motility in mice.

RESULTS

Of the 67 patients evaluated at the C. difficile clinic, 40 patients (59.7%) were confirmed to have CDI, and 22 patients (32.8%) with post-CDI IBS (diarrhea-type, constipation-type, and mixed-type). In infected mice, levels of MPO in stools and clinical score were higher on day 3. On day 21, mice recovered from body weight loss induced by CDI, and fecal MPO was undetectable. The total GI transit time (TGITT) and FITC-70kDa levels on the proximal colon were increased in infected mice (p = 0.002), suggesting a constipation phenotype post-acute phase of CDI. A positive correlation intestinal inflammation on day 3 and TGITT on day 21 was observed.

CONCLUSION

In conclusion, post-infection intestinal dysfunction occurs in humans and mice post-CDI. Importantly, we have validated in the mouse model that CDI causes abnormal GI transit in the recovery phase of the disease, indicating the potential utility of the model in exploring the underlying mechanisms of post-infectious IBS in humans.

The impact of running on gastrointestinal symptoms in patients with irritable bowel syndrome

INTRODUCTION

Physical activity has been suggested to alleviate gastrointestinal (GI) symptoms in patients with irritable bowel syndrome (IBS); however, evidence is scarce. Running has become increasingly popular and may be beneficial for patients with IBS. To obtain more insight in the potential application of running as therapy, we aimed to explore the impact of running and its intensity on GI symptoms in patients with IBS.

METHODS

Data from a large observational study in runners were used for this nested case-control study, which included 153 runners with IBS and 153 controls. All participants had completed a questionnaire on personal characteristics, running characteristics and GI symptoms. Regarding GI symptoms, the severity of nine symptoms was asked, both at rest and during and/or shortly (up to 3 h) after running. Each symptom could be scored on a scale from 0 (not bothersome) to 100 (very bothersome), resulting in a maximum total score of 900 points.

KEY RESULTS

The prevalence and total severity score of GI symptoms were higher in runners with IBS than in controls, both at rest and during running. Among runners with IBS, the median (25th-75th percentile) total severity score during/after running was significantly lower than at rest (118 [50-200] vs. 150 [90-217]), while in controls no significant difference between running and rest was observed. Analyses stratified for running intensity revealed that the beneficial effect in runners with IBS was present when their most intensive training session was moderately intensive or intensive but not very intensive.

CONCLUSIONS & INFERENCES

Running, particularly on moderate intensity, could have a beneficial effect on GI symptoms in patients with IBS.

Effects of Cirsium palustre Extracts and Their Main Flavonoids on Colon Motility-An Ex Vivo Study

For centuries, various species from the genus Cirsium have been utilized in traditional medicine worldwide. A number of ethnopharmacological reports have pointed out that Cirsium plants can be applied to diminish digestive problems. Among them, Cirsium palustre (L.) Scop. (Asteraceae) stands out as a promising herbal drug candidate because its constituents exhibit antimicrobial and antioxidant potential, as evidenced by ethnopharmacological reports. As a result, the species is particularly intriguing as an adjunctive therapy for functional gastrointestinal and motility disorders. Our research goal was to verify how the extracts, fractions, and main flavonoids of C. palustre affect colon contractility under ex vivo conditions. An alternative model with porcine-isolated colon specimens was used to identify the effects of C. palustre preparations and their primary flavonoids. LC-ESI-MS was utilized to evaluate the impacts of methanol (CP1), methanolic 50% (CP2), and aqueous (CP3) extracts as well as diethyl ether (CP4), ethyl acetate (CP5), and n-butanol (CP6) fractions. Additionally, the impacts of four flavonoids, apigenin (API), luteolin (LUT), apigenin 7-O-glucuronide (A7GLC), and chrysoeriol (CHRY), on spontaneous and acetylcholine-induced motility were assessed under isometric conditions. The results showed that C. palustre extracts, fractions, and their flavonoids exhibit potent motility-regulating effects on colonic smooth muscle. The motility-regulating effect was observed on spontaneous and acetylcholine-induced contractility. All extracts and fractions exhibited an enhancement of the spontaneous contractility of colonic smooth muscle. For acetylcholine-induced activity, CP1, CP2, and CP4 caused a spasmolytic effect, and CP5 and CP6 had a spasmodic effect. LUT and CHRY showed a spasmolytic effect in the case of spontaneous and acetylcholine-induced activity. In contrast, API and A7GLC showed a contractile effect in the case of spontaneous and pharmacologically induced activity. Considering the results obtained from the study, C. palustre could potentially provide benefits in the treatment of functional gastrointestinal disorders characterized by hypomotility and hypermotility.

Parieto-occipital ERP indicators of gut mechanosensation in humans

Understanding the neural processes governing the human gut-brain connection has been challenging due to the inaccessibility of the body's interior. Here, we investigated neural responses to gastrointestinal sensation using a minimally invasive mechanosensory probe by quantifying brain, stomach, and perceptual responses following the ingestion of a vibrating capsule. Participants successfully perceived capsule stimulation under two vibration conditions (normal and enhanced), as evidenced by above chance accuracy scores. Perceptual accuracy improved significantly during the enhanced relative to normal stimulation, which was associated with faster stimulation detection and reduced reaction time variability. Capsule stimulation induced late neural responses in parieto-occipital electrodes near the midline. Moreover, these 'gastric evoked potentials' showed intensity-dependent increases in amplitude and were significantly correlated with perceptual accuracy. Our results replicated in a separate experiment, and abdominal X-ray imaging localized most capsule stimulations to the gastroduodenal segments. Combined with our prior observation that a Bayesian model is capable of estimating computational parameters of gut-brain mechanosensation, these findings highlight a unique form of enterically-focused sensory monitoring within the human brain, with implications for understanding gut feelings and gut-brain interactions in healthy and clinical populations.