Abdominal pain is associated with anxiety and depression scores in a sample of the general adult population with no signs of organic gastrointestinal disease

Long term outcomes of robotic-assisted abdominal wall reconstruction: a single surgeon experience

INTRODUCTION

Robotic abdominal wall reconstruction (RAWR) is one of the most significant advances in the management of complex abdominal wall hernias. The objective of this study was to evaluate long term outcomes in a cohort of patients that underwent complex RAWR in a single center.

METHODS

This was a longitudinal retrospective review of a cohort of 56 patients who underwent complex RAWR at least 24 months prior by a single surgeon at a tertiary care institution. All patients underwent bilateral retro-rectus release (rRRR) with or without robotic transversus abdominis release (rTAR). Data collected include demographics, hernia details, operative and technical details. The prospective analysis included a post-procedure visit of at least 24 months from the index procedure with a physical examination and quality of life survey using the Carolinas Comfort Scale (CCS). Patients with reported symptoms concerning for hernia recurrence underwent radiographic imaging. Descriptive statistics (mean ± standard deviation or median) were calculated for continuous variables. Chi-square or Fisher's exact test as deemed appropriate for categorical variables, and analysis of variance or the Kruskal-Wallis test for continuous data, were performed among the separate operative groups. A total score for the CCS was calculated and analyzed in accordance with the user guidelines.

RESULTS

One-hundred and-forty patients met the inclusion criteria. Fifty-six patients consented to participate in the study. Mean age was 60.2 years. Mean BMI was 34.0. Ninety percent of patients had at least one comorbidity and 52% of patients were scored ASA 3 or higher. Fifty-nine percent were initial incisional hernias, 19.6% were recurrent incisional hernias and 8.9% were recurrent ventral hernias. The mean defect width was 9 cm for rTAR and 5 cm for rRRR. The mean implanted mesh size was 945.0 cm² for rTAR and 362.5 cm² for rRRR. The mean length of follow-up was 28.1 months. Fifty-seven percent of patients underwent post-op imaging at an average follow-up of 23.5 months. Recurrence rate was 3.6% for all groups. There were no recurrences in patients that underwent solely bilateral rRRR. Two patients (7.7%) that underwent rTAR procedures were found with recurrence. Average time to recurrence was 23 months. Quality of life survey demonstrated an overall CCS score of 6.63 ± 13.95 at 24 months with 12 (21.4%) patients reporting mesh sensation, 20 (35.7%) reporting pain, and 13 (23.2%) reporting movement limitation.

CONCLUSION

Our study contributes to the paucity of literature describing long term outcomes of RAWR. Robotic techniques offer durable repairs with acceptable quality of life metrics.

Sexualized Violence and Neoliberal Discourse

Researchers have paid relatively little attention to the role that sexual and gender violence play in reinforcing neoliberal discourse. We address this issue by demonstrating that the portrayal of women and girls in the mainstream media, female body practices based on this portrayal, gendered sexual-agency norms, sexual harassment, and rape are not only sexualized and violent, but they also display a common set of cultural scripts drawn from both patriarchal and neoliberal discourse. We thus conclude that these images, practices, and norms are forms of sexualized violence that reinforce patriarchal and neoliberal discourse and, thus, the gender and class orders.

Evaluating the role of anxiety on the association between irritable bowel syndrome and brain volumes: a mediation analysis in the UK Biobank cohort

There is a strong link between irritable bowel syndrome and brain volumes, yet, to date, research examining the mediators of this association has been little. Based on the phenotypic data of 15 248 participants from the UK Biobank, a two-stage mediation analysis was performed to assess the association among brain volumes, anxiety, and irritable bowel syndrome. In the first stage, we identified the candidate mediating role of anxiety for irritable bowel syndrome associated with brain volumes using regression models. Then, we quantified the magnitude of the mediation effects by evaluating the average causal-mediated effect and proportion of mediation through performing mediation analyses in the R package in the second stage. In the first stage, we identified the partly mediating role of anxiety in the association between irritable bowel syndrome and the volume of thalamus (P _left = 1.16 × 10^-4, P _right = 2.41 × 10^-4), and grey matter (P _left = 3.22 × 10^-2, P _right = 1.18 × 10^-2) in the VIIIa cerebellum. In the second stage, we observed that the proportion of the total effect of irritable bowel syndrome on volume of thalamus mediated by anxiety was 14.3% for the left region (β _{Average causal-mediated effect} = -0.008, P _{Average causal-mediated effect} = 0.004) and 14.6% for the right region (β _{Average causal-mediated effect} = -0.007, P _{Average causal-mediated effect} = 0.006). Anxiety mediated 30.8% for the left region (β _{Average causal-mediated effect} = -0.013, P _{Average causal-mediated effect} = 0.002) and 21.6% for the right region (β _{Average causal-mediated effect} = -0.010, P _{Average causal-mediated effect} x= 0.018) of the total effect of irritable bowel syndrome on the volume of grey matter in the VIIIa cerebellum. Our study revealed the indirect mediating role of anxiety in the association between irritable bowel syndrome and brain volumes, promoting our understanding of the functional mechanisms of irritable bowel syndrome and its related psychosocial factors.

Abdominal pain in Finnish young adults with juvenile idiopathic arthritis

OBJECTIVES

Abdominal pain (AP) is a common feature in the general population. However, in patients with juvenile idiopathic arthritis (JIA) AP has scantily been studied. Among other reasons, gastrointestinal symptoms may present as side effects due to the medical treatment of JIA. The aim of the study was to explore the frequency of AP and its relationship to disease components and health-related quality of life (HRQoL) among young adults with JIA.

METHODS

This study included a cohort of 97 Finnish patients belonging to the population-based Nordic JIA cohort at their 17-year follow-up study visit. Mean age of the patients was 23 years. AP, functional status, fatigue, HRQoL, disease characteristics of JIA, and comorbidities were evaluated. AP was classified into three categories according to frequency: (1) never, (2) seldom (one to three times a month) and (3) frequent (at least once a week).

RESULTS

About 48 (50%) young adults with JIA reported AP. Seldom AP was reported by 37 (38%), and frequent AP by 11 (11%) patients. AP was significantly associated with fatigue, female gender, functional status and arthritis-related pain. Patients having frequent AP reported lower HRQoL. AP was associated with the use of methotrexate and sulfasalazine, but not with nonsteroidal anti-inflammatory drugs (NSAIDs).

CONCLUSION

AP is an important complaint in young adults with JIA and is associated with fatigue, female gender, methotrexate and sulfasalazine use. Patients with JIA reporting frequent AP with lower functional status and higher arthritis-related pain values have lower HRQoL.

Association Between Food Intake and Gastrointestinal Symptoms in Patients With Obesity

BACKGROUND AND AIMS

Hunger, satiation, postprandial satiety, and hedonic eating constitute key food intake parameters. We aim to study whether these symptoms are associated with gastrointestinal symptoms (GIS) in patients with obesity.

METHODS

This is a cross-sectional study of patients with obesity. Patients completed the following validated biomarkers and questionnaires: hunger was measured via visual analog scale (100 mm) following a standard meal, satiation was measured via ad libitum meal (calories to fullness; kcal), postprandial satiety was measured via gastric emptying scintigraphy (T_1/2; mins), and hedonic eating was measured via the Hospital Anxiety and Depression Scale questionnaire. Participants completed the abridged Bowel Disease Questionnaire to evaluate their GIS. We calculated the odds ratios (ORs) adjusted for sex, weight, and age between food intake parameters <25^th or >75^th percentile observed in a prior cohort of 450 participants with obesity and GIS.

RESULTS

A total of 274 participants (41 ± 10 [SD] years, 75% females, body mass index 39 ± 8 kg/m²) were included in the analysis. Increased hunger was associated with a lower prevalence of lumpy stools (OR = 0.18, P = .02). Satiation was associated with abdominal pain/discomfort (relieved by defecation [OR = 2.4, P = .02] or associated with change in stool consistency [OR = 2.92, P < .01]), loose/watery stools (OR = 2.09, P = .02), and bloating (OR = 2.49, P < .01). Abnormal postprandial satiety was associated with bloating (OR = 2.26, P < .01) and loose/watery stools (OR = 1.84, P = .04). Hedonic eating was associated with abdominal pain/discomfort with stool frequency change (OR = 2.4, P = .02), >3 bowel movements per day (OR = 1.93, P = .048), bloating (OR = 2.49, P = .01), abdominal pain after meals >1 per month (OR = 4.24, P < .01), and nausea >1 per week (OR = 4.51, P < .01).

CONCLUSION

Alterations in hunger, satiation, postprandial satiety, and hedonic eating are associated with GIS in patients with obesity.

Meaning in Life and Pain: The Differential Effects of Coherence, Purpose, and Mattering on Pain Severity, Frequency, and the Development of Chronic Pain

Objective

Meaning in life is consistently associated with better health outcomes across a range of mental and physical domains. However, meaning in life is a complex construct involving three distinct facets: coherence, purpose, and mattering. While these facets have been studied individually in relation to pain, they have not been assessed concurrently to parse out their potential distinct contributions to pain outcomes. We sought to identify the unique relationships of these individual facets of meaning with pain experiences and specify the components associated with pain-related resilience.

Methods

The associations of coherence, purpose, and mattering with pain outcomes were examined across three studies. Study 1 used data from the Midlife in the United States National Survey to determine associations between facets and the frequency of various recently experienced pains, and the development of chronic pain nine years later. Study 2 cross-sectionally observed the association between facets and recent pain severity in young adults. Using a diary-type approach, Study 3 captured fluctuations of pain severity in relation to the facets across the span of four weeks.

Results

Coherence was uniquely associated with less headache, backache, joint, and extremities pain frequency in Study 1, over and above purpose and mattering, controlling for other health variables. Coherence was also associated with lower odds of developing chronic pain. In Study 2, coherence was associated with less pain severity and fully mediated the relationship between global meaning in life and pain. Study 3 found that coherence predicted the most unique variance in weekly pain fluctuations.

Conclusion

Across three studies and timescales, coherence was uniquely associated with fewer and less severe pain experiences over and above purpose and mattering. These findings provide support for the value of coherence as a resilience factor in the context of pain and suggest a potential benefit for coherence-specific interventions in clinical settings.

Cognitive-behavioural pathways from pain to poor sleep quality and emotional distress in the general population: The indirect effect of sleep-related anxiety and sleep hygiene

OBJECTIVES

Pain can have a negative impact on sleep and emotional well-being. This study investigated whether this may be partly explained by maladaptive sleep-related cognitive and behavioural responses to pain, including heightened anxiety about sleep and suboptimal sleep hygiene.

METHODS

This cross-sectional study used data from an online survey that collected information about pain (Brief Pain Inventory), sleep (Pittsburgh Sleep Quality Index; Sleep Hygiene Index; Anxiety and Preoccupation about Sleep Questionnaire) and emotional distress (PROMIS measures; Perceived Stress Scale). Structural equation modelling examined the tenability of a framework linking these factors.

RESULTS

Of 468 survey respondents (mean age 39 years, 60% female), 29% reported pain (mean severity 1.12), most commonly in the spine or low back (28%). Pain severity correlated with poor sleep quality, poor sleep hygiene, anxiety about sleep and emotional distress. In the first structural equation model, indirect effects were identified between pain severity and sleep quality through anxiety about sleep (β = .08, p < .001) and sleep hygiene (β = .12, p < .001). In the second model, an indirect effect was identified between pain severity and emotional distress through sleep quality (β = .19, p < .01). Combining these models, indirect effects were identified between pain severity and emotional distress through anxiety about sleep, sleep hygiene and sleep quality.

CONCLUSIONS

This study provides data to support the tenability of a theoretically guided framework linking pain, sleep and emotional distress. If upheld by experimental and/or longitudinal study, this framework holds the potential to inform public health initiatives and more comprehensive pain assessment.

Correlation between Gut Microbiota and Six Facets of Neuroticism in Korean Adults

A person high in neuroticism is more likely to experience anxiety, stress, worry, fear, anger, and depression. Previous studies have shown that the gut microbiota can influence personality and mental disorders, including stress, anxiety, and depression, through the gut-brain axis. Here, we investigated the correlations between the sub-facet of neuroticism and gut microbiota using the Revised NEO Personality Inventory and the 16S rRNA gene sequencing data 784 adults. We found that the high anxiety and vulnerability group showed significantly lower richness in microbial diversity than a group with low anxiety and vulnerability. In beta diversity, there was a significant difference between the low and high groups of anxiety, self-consciousness, impulsiveness, and vulnerability. In taxonomic compositions, Haemophilus belonging to Gammaproteobacteria was correlated with the Neuroticism domain as well as N1 anxiety and N6 vulnerability facets. The high N1 anxiety and N6 vulnerability group was correlated with a low abundance of Christensenellaceae belonging to Firmicutes Clostridia. High N4 self-consciousness was correlated with a low abundance of Alistipes and Sudoligranulum. N5 impulsiveness was correlated with a low abundance of Oscillospirales. Our findings will contribute to uncovering the potential link between the gut microbiota and neuroticism, and the elucidation of the correlations of the microbiome-gut-brain axis with behavioral changes and psychiatric cases in the general population.

Implications on hypnotherapy: Neuroplasticity, epigenetics and pain

We provide a brief review about the significance of hypnosis with respect to applications and physiological processes in hypnotherapy. Our review concludes that hypnosis is a promising method to manage acute and chronic pain. In addition, we discuss indications pointing toward the view that hypnosis can induce changes in neuroplasticity possibly involving epigenetic mechanisms.

Probiotics: Potential novel therapeutics for microbiota-gut-brain axis dysfunction across gender and lifespan

Probiotics are live microorganisms, which when administered in adequate amounts, present a health benefit for the host. While the beneficial effects of probiotics on gastrointestinal function are generally well recognized, new animal research and clinical studies have found that alterations in gut microbial communities can have a broad range of effects throughout the body. Non-intestinal sites impacted include the immune, endocrine, cardiovascular and the central nervous system (CNS). In particular, there has been a growing interest and appreciation about the role that gut microbiota may play in affecting CNS-related function through the 'microbiota-gut-brain axis'. Emerging evidence suggests potential therapeutic benefits of probiotics in several CNS conditions, such as anxiety, depression, autism spectrum disorders and Parkinson's disease. There may also be some gender-specific variances in terms of probiotic mediated effects, with the gut microbiota shaping and being concurrently molded by the hormonal environment governing differences between the sexes. Probiotics may influence the ability of the gut microbiome to affect a variety of biological processes in the host, including neurotransmitter activity, vagal neurotransmission, generation of neuroactive metabolites and inflammatory response mediators. Some of these may engage in cross talk with host sex hormones, such as estrogens, which could be of relevance in relation to their effects on stress response and cognitive health. This raises the possibility of gender-specific variation with regards to the biological action of probiotics, including that on the endocrine and central nervous systems. In this review we aim to describe the current understanding in relation to the role and use of probiotics in microbiota-gut-brain axis-related dysfunction. Furthermore, we will address the conceptualization and classification of probiotics in the context of gender and lifespan as well as how restoring gut microbiota composition by clinical or dietary intervention can help in supporting health outcomes other than those related to the gastrointestinal tract. We also evaluate how these new learnings may impact industrial effort in probiotic research and the discovery and development of novel and more personalized, condition-specific, beneficial probiotic therapeutic agents.

Common mental disorders in irritable bowel syndrome: pathophysiology, management, and considerations for future randomised controlled trials

The frequent co-occurrence of irritable bowel syndrome and the common mental disorders of anxiety and depression is well established. A range of biological and psychosocial disease mechanisms are common to both disorders, many of which contribute to a dysregulated gut-brain axis. Clinical and subthreshold psychological comorbidity adds to the functional impairment and disease burden in individuals with irritable bowel syndrome. Progress is being made with regard to understanding irritable bowel syndrome in the clinical setting from a biopsychosocial perspective. However, until now, most trials of irritable bowel syndrome treatment still consider the disease as a gut disorder in isolation, which leaves major gaps in knowledge about disease-disease interactions and treatment outcomes in irritable bowel syndrome. In this Viewpoint, we review the epidemiology, pathophysiology, and management of anxiety and depression in individuals with irritable bowel syndrome. We also provide methodological recommendations for future randomised controlled trials and outline guidance for research that better incorporates psychiatric comorbidity into its design, with a view to improve treatment outcomes for individuals with irritable bowel syndrome.

Pain Symptoms in Patients with Coronavirus Disease (COVID-19): A Literature Review

Purpose

On 11 March, 2020, the coronavirus disease (COVID-19) outbreak was declared as a global pandemic by the World Health Organization. It brought substantial physical and psychological burden on individuals and financial loss across countries. Patients with COVID-19 may exhibit various symptoms, such as fever, cough, dyspnea, muscle pain, sore throat, headache, chest pain, and abdominal pain, at 2–14 days after exposure to the novel coronavirus (severe acute respiratory syndrome [SARS]-CoV-2). Pain symptoms present important challenge to clinicians’ diagnosis when treating COVID-19 patients with mild symptoms. Considering the increasing number of confirmed COVID-19 cases, the pain symptoms should be systematically summarized.

Results

The virus can invade different tissues of the body and cause different pain manifestations. SARS-CoV-2 primarily invades the respiratory system, and patients develop sore throat, fever, cough, and other pneumonia-associated symptoms. Moreover, it infects the nervous system (eg, headache, dizziness, and confusion), digestive system (eg, abdominal pain, diarrhea), and cardiovascular system (eg, chest pain, palmus, and cardiac injury). The incidence rate is 1.7–33.9% for headache, 0.7–47.1% for sore throat, 1.5–61.0% for myalgia/arthralgia, 1.6–17.7% for chest pain, and 1.9–14.5% for abdominal pain. In comparison with chest and abdominal pain, COVID-19 patients are more likely to develop headache, sore throat, and myalgia/arthralgia.

Conclusion

Different pain reflects the damage of different body systems. Therefore, the summary of pain symptoms for COVID-19 patients can help doctors improve the accuracy and efficiency of diagnosis when treating COVID-19 patients with atypical or mild symptoms and adopt more targeted treatment methods.

The Lived Experience of Inpatients With Acute Recurrent Pancreatitis: A Qualitative Research Study From West China

The incidence of acute pancreatitis (AP) has increased year by year. Approximately 20%-30% of these patients will have further subsequent attacks, described as acute recurrent pancreatitis (ARP). Patients who are repeatedly admitted to hospitals suffer significant psychological problems and mental hardships. In the current study, we aimed to illuminate the lived experience of inpatients with ARP from Chongqing, China. A purposive sample of 13 ARP patients was recruited from the First Affiliated Hospital of Chongqing Medical University. Semistructured and in-depth qualitative interviews were adopted in this phenomenological research. Data were analyzed by Colaizzi's Method of descriptive phenomenology and feedback on early findings from the participants. All interviews were audio-recorded and transcribed with the permission of the participants. Five themes presented in the study: anxiety and fear, lack of related knowledge, inevitability and helplessness, guilt and shame, hope, and perseverance. Overall, the ARP inpatients showed complexed experience, both active and positive. They also performed poor compliance during their hospitalization but wished for professional knowledge. Nurses should pay attention to their psychological changes to take effective interventions for them.

Preliminary investigation of the associations between psychological flexibility, symptoms and daily functioning in people with chronic abdominal pain

Objective

Acceptance and commitment therapy (ACT), based in the psychological flexibility model, may benefit people with chronic abdominal pain. The current study preliminarily investigates associations between psychological flexibility processes and daily general, social and emotional functioning in chronic abdominal pain.

Methods

An online survey comprising measures of psychological flexibility processes and daily functioning was distributed through social media.

Subjects

In total, 89 participants with chronic abdominal pain were included in the analyses.

Results

All investigated psychological flexibility processes significantly correlated with pain interference, work and social adjustment, and depression, in the expected directions (|r| = .35-.68). Only pain acceptance significantly correlated with gastrointestinal (GI) symptoms, r = -.25. After adjusting for pain in the analyses, pain acceptance remained significantly associated with all outcomes, |β| = .28-.56, but depression. After adjusting for pain and pain acceptance, only cognitive fusion remained significantly associated with anxiety, β = -.27, and depression, β = .43. When contrasting GI-specific anxiety with psychological flexibility processes, pain acceptance was uniquely associated with pain-related interference and work and social adjustment, and cognitive fusion and committed action were uniquely associated with depression.

Conclusions

Psychological flexibility processes were positively associated with daily functioning in people with chronic abdominal pain. ACT may provide benefit for these people. Further studies with experimental designs are needed to examine the utility of ACT for people with abdominal pain.

Functional somatic illnesses in patients with functional bowel disorders. A cross-sectional cohort study in western Saudi Arabia

OBJECTIVES

To study the prevalence of functional gastrointestinal disorders (FGID) in Saudi patients with irritable bowel syndrome (IBS). Methods: A cross-sectional study was conducted in patients with IBS treated at a private tertiary medical center in western Saudi Arabia between 2013 and 2017. We used ROME 3 criteria with data from the Generalized Anxiety Disorder 7-item (GAD-7) scale, the Patient Health Questionnaire-9 (PHQ-9) depression scale, and International Classification of Headache Disorders (ICHD) to assess the prevalence of psychosomatic illness. Statistical analysis of frequency and statistical correlation was performed using Chi-square. Results: The final analysis of 307 patients revealed a combined 425 diagnoses of psychosomatic illness, including diagnoses of headache in 104 patients (34%), migraine in 93 patients (30.5%), fibromyalgia in 169 patients (55%), and depression in 59 patients (19%). There was a statistically significant correlation between patients' ages and diagnoses of joint pain and migraines. Conclusion: Fibromyalgia and headache disorders were common in this cohort of Saudi patients with IBS. This coexistence of illness is partly explained by the functional nature of these illnesses. Collective efforts to provide multidisciplinary care is needed for these patients.

The relationship between abdominal pain and emotional wellbeing in children and adolescents in the Raine Study

Abdominal pain is a common reason for medical visits. We examined the prevalence, gastrointestinal, and emotional significance of abdominal pain in a population-based cohort serially followed up from birth to 17 years. Children and adolescents from Generation 2 of the Raine Study participated in comprehensive cross-sectional assessments at ages 2, 5, 8, 10, 14 and 17 years. At 17 years, medical history, general health, gastrointestinal symptoms, medications, health practitioner attendance, and self-rated unhappiness were recorded. Longitudinal data regarding abdominal pain or unhappiness, from serial questionnaires, were analysed to identify factors associated with abdominal pain and adverse emotional health at age 17 years. Females experienced more abdominal pain than males at all ages (p < 0.05). Seventeen-year-old adolescents with abdominal pain reported a higher prevalence of depression, anxiety, being bullied at school, and poorer health status than those without abdominal pain (p < 0.05 for all). Abdominal pain and unhappiness during childhood and mid-adolescence were prospectively associated with recurrent abdominal pain, anxiety, depression and unhappiness during late adolescence (p < 0.05 for all). In conclusion, abdominal pain in children and adolescents associates with depression, anxiety, being bullied, unhappiness and reduced overall health-rating during adolescence. Awareness of these factors may guide management decisions.

Genetic correlations between pain phenotypes and depression and neuroticism

Correlations between pain phenotypes and psychiatric traits such as depression and the personality trait of neuroticism are not fully understood. In this study, we estimated the genetic correlations of eight pain phenotypes (defined by the UK Biobank, n = 151,922–226,683) with depressive symptoms, major depressive disorders and neuroticism using the the cross-trait linkage disequilibrium score regression (LDSC) method integrated in the LD Hub. We also used the LDSC software to calculate the genetic correlations among pain phenotypes. All pain phenotypes, except hip pain and knee pain, had significant and positive genetic correlations with depressive symptoms, major depressive disorders and neuroticism. All pain phenotypes were heritable, with pain all over the body showing the highest heritability (h² = 0.31, standard error = 0.072). Many pain phenotypes had positive and significant genetic correlations with each other indicating shared genetic mechanisms. Our results suggest that pain, neuroticism and depression share partially overlapping genetic risk factors.

Abdominal pain during the menopause transition and early postmenopause: observations from the Seattle Midlife Women's Health Study

Objective

To assess the relationship between abdominal pain severity during the menopausal transition (MT) and age, MT stage, reproductive biomarkers, stress biomarkers, and stress perceptions.

Methods

Women ages 35-55 were recruited from multiethnic neighborhoods in the greater Seattle area from 1990 to 1992, for an original study cohort of 508. From 1990 to 2013, a subset of this cohort consented to ongoing annual data collection by annual health questionnaire, health diary, and daily menstrual calendar. Beginning in 1997, a portion of these women also provided a first morning voided urine specimen to be assayed for levels of estrone glucuronide (E₁G), follicle stimulating hormone (FSH), testosterone, cortisol, norepinephrine, and epinephrine. To identify how changes in abdominal pain severity changed over time in relation to age, MT stage, reproductive biomarkers, stress-related biomarkers, and stress-related perceptions, mixed effects modeling was used.

Results

In a univariate model, E₁G (p = 0.02) and testosterone (p = 0.02) were significantly and negatively related to abdominal pain severity, while perceived stress (p = 0.06), tension (p <  0.001), and anxiety (p <  0.001) were significantly and positively associated. In a multivariate model, increasing age (p = 0.001) and E₁G (p = 0.04) were negatively associated with abdominal pain severity, and anxiety (p = 0.00) positively associated. Testosterone did not improve the fit to the final model, nor did tension or perceived stress.

Conclusions

These results suggest that age, anxiety, and E₁G each show a significant association with abdominal pain severity in the MT. In contrast, stress perception, tension, testosterone, stress biomarkers, and MT stage do not. These factors should be evaluated further in research on abdominal pain experienced during the MT and early postmenopause years.

Comorbidity and retirement in cervical dystonia

BACKGROUND

Cervical dystonia (CD) is the most common form of dystonia. The onset of CD is usually before 60 years of age and it may cause severe functional and psychosocial impairment in everyday life. Recently non-motor symptoms have been reported to occur in CD substantially affecting the quality of life.

METHODS/PATIENTS

We studied comorbidities of patients with primary focal CD in Finland based on ICD-10 codes obtained from the care registry and patient records of 937 confirmed adult isolated focal CD patients between the years 2007-2016. The retirement months and diagnosis of retirement were calculated from pension registry information. The results were compared with 3746 age and gender-matched controls.

RESULTS

Most prominent comorbidities with primary focal CD were depression (14%), anxiety (7%), and back pain (11%). The retirement age was significantly younger in CD patients compared to control group controls (59.0 years, 95% CI 58.5-59.5 vs. 61.7 years, 95% CI 61.6-61.9) years, p < 0.001). For dystonia patients the most common diagnoses for retirement due to sickness were dystonia (51%), depression (14%), and anxiety (8%). Patients with anxiety and depression retired earlier than other dystonia patients.

DISCUSSION

Cervical dystonia considerably reduces working ability and leads to earlier retirement. Anxiety and depression are most notable comorbidities and their co-occurrence further reduces working ability. Our results suggest that more health care resources should be administered in treatment of CD to longer maintain working ability of CD patients. Further, psychiatric comorbidities should be taken into consideration in CD treatment.

The temporal relationship of daily life stress, emotions, and bowel symptoms in irritable bowel syndrome-Diarrhea subtype: A smartphone-based experience sampling study

BACKGROUND

The current study aimed to model the moment-to-moment relationship between daily life stress, emotions, and bowel symptoms among patients with irritable bowel syndrome-diarrhea subtype (IBS-D) in the flow of daily life using a smartphone-based experience sampling method (ESM).

METHODS

Patients with IBS-D (N = 27) and healthy controls (HC; N = 30) completed ESM ratings of their real-time daily life stress, which was defined as subjective stress related to daily activities, both positive and negative emotions, as well as bowel symptoms eight times a day for 14 consecutive days, following a baseline interview measuring bowel and mood symptoms. Moment-to-moment association between ESM variables was tested within and between groups using multilevel regression modeling.

KEY RESULTS

Patients with IBS-D reported more severe bowel symptoms and lower positive affect than HCs, but levels of daily life stress and negative affect were comparable between groups. Time-lagged analysis of ESM data revealed that, among patients with IBS-D, daily life stress predicted a decrease in abdominal pain and urgency to defecation at a subsequent time point, whereas severity of bowel symptoms and occurrence of diarrhea predicted a subsequent increase in negative affect and daily life stress. The above associations were not found among HCs.

CONCLUSIONS AND INFERENCES

ESM unveiled the dynamic relationship between bowel symptoms, stress, and emotionality. Patients with IBS-D responded to bowel symptoms with more stress and distress momentarily. Counter-intuitively, daily life activity stress appeared to ameliorate bowel symptoms, although a more rigorous study design is required to testify this claim. Psychological understanding of IBS-D is discussed.

Adherence with a low-FODMAP diet in irritable bowel syndrome: are eating disorders the missing link?

OBJECTIVES

The low-FODMAP diet has emerged as an option for the treatment of irritable bowel syndrome (IBS). This diet is very restrictive, and compliance is usually low. Preliminary findings suggest an association between eating disorders (EDs) and the risk of developing IBS. The aim of this study was to assess the correlation between compliance with a low-FODMAP diet and the risk of ED behaviours among patients with IBS.

PATIENTS AND METHODS

A single-centre prospective study was carried out among 233 IBS patients (79.8% females) at University College London Hospital, who commenced a low FODMAPs group programme for IBS (Rome III or IV). Self-reported diet adherence at the end of the 6-week programme was measured. At baseline, and at the 6-week follow-up visit, participants completed the validated IBS-Symptom Severity Score, the SCOFF ED screening questionnaire and the Hospital Anxiety and Depression Scale.

RESULTS

Adherence with a low-FODMAP diet was found in 95 (41%) patients. Overall, 54 (23%) patients were classified to be at risk for ED behaviour. Adherence was 57% in the ED group (31/54) versus 35% in the non-ED group (64/179); P<0.05. Adherence with a low-FODMAP diet was highest (51%) in the IBS with diarrhoea subtype and lowest (10%) in IBS with constipation. There was no significant correlation between IBS-Symptom Severity Score and either adherence (P=0.39) or ED behaviour (P=0.28).

CONCLUSION

In this IBS cohort, greater adherence to a low-FODMAP diet is associated with ED behaviour. The implications of our study are important in clinical practice for a clinician to have a high index of suspicion of EDs in IBS patients when a high level of low-FODMAP diet achieved.

Gastrointestinal recall questionnaires compare poorly with prospective patient diaries for gastrointestinal symptoms: data from population and primary health centre samples

BACKGROUND

Clinical understanding of gastrointestinal symptoms is commonly based on patient reports of symptom experience. For diagnosis and treatment choices to be appropriate, symptom reports need to be accurate. We examined the agreement between questionnaire recall and prospective diary enumeration of symptoms relevant to the irritable bowel syndrome.

PATIENTS AND METHODS

Data are reported from a randomly selected general population sample (n=238) and also a primary healthcare centre (PHC) sample (n=503, 10 PHCs). All the patients completed the questionnaires, which included Rome III-qualifying irritable bowel syndrome items and a stool and symptom diary over either 7 or 14 days. Agreement between retrospective questionnaire reports and prospective diaries was evaluated.

RESULTS

Concordance between questionnaires and diaries was highest for the simple construct of the occurrence of abdominal pain, although after adjusting for possible chance, agreement was only moderate in the general population sample. More complex constructs, such as pain relieved by defecation, yielded poorer concordance. In general, concordance was stronger among PHC respondents than in the general population sample.

CONCLUSION

Concordance between questionnaires and diaries was generally poor and related to the complexity of the symptom construct and the type of respondent. The information used to classify individuals based on patient self-report may be unreliable, and therefore, more effort is needed to develop data collection instruments.

Multiple psychological factors predict abdominal pain severity in children with irritable bowel syndrome

BACKGROUND

Anxiety and depression are implicated as contributors to abdominal pain in pediatric irritable bowel syndrome (IBS) but is unclear if this pain is associated with other psychological factors. The study objective was to test if the impact of anxiety or depression on IBS symptom severity is mediated by somatization and/or pain catastrophizing.

METHODS

We utilized baseline data from local pediatric IBS clinical studies. Through mediation analysis, we assessed whether somatization or pain catastrophizing mediated (either independently or combined) the separate relationships of anxiety or depression with IBS abdominal pain severity.

KEY RESULTS

We analyzed 261 participants. All psychological factors were positively correlated with one another and IBS abdominal pain severity. The association of anxiety with IBS abdominal pain was mediated by both somatization and pain catastrophizing in individual analyses (each mediated standardized coefficient [β] 0.11, CI 0.05-0.18) and in multiple analysis (mediated standardized β 0.18, CI 0.09-0.27). The association of depression with IBS abdominal pain was also mediated by somatization (mediated standardized β 0.08, CI0.02-0.14) and pain catastrophizing (mediated standardized β 0.06, CI 0.01-0.11) in individual analyses and in multiple analysis (mediated standardized β 0.19, CI 0.04-0.19).

CONCLUSIONS AND INFERENCES

Somatization and pain catastrophizing mediate the relationships between anxiety/depression and IBS abdominal pain severity. These findings suggest that somatization and pain catastrophizing may be better treatment targets than anxiety and depression. Clinicians should assess these psychological factors in pediatric IBS patients and refer for intervention to improve outcomes.

Human visceral nociception: findings from translational studies in human tissue

Peripheral sensitization of nociceptors during disease has long been recognized as a leading cause of inflammatory pain. However, a growing body of data generated over the last decade has led to the increased understanding that peripheral sensitization is also an important mechanism driving abdominal pain in highly prevalent functional bowel disorders, in particular, irritable bowel syndrome (IBS). As such, the development of drugs that target pain-sensing nerves innervating the bowel has the potential to be a successful analgesic strategy for the treatment of abdominal pain in both organic and functional gastrointestinal diseases. Despite the success of recent peripherally restricted approaches for the treatment of IBS, not all drugs that have shown efficacy in animal models of visceral pain have reduced pain end points in clinical trials of IBS patients, suggesting innate differences in the mechanisms of pain processing between rodents and humans and, in particular, how we model disease states. To address this gap in our understanding of peripheral nociception from the viscera and the body in general, several groups have developed experimental systems to study nociception in isolated human tissue and neurons, the findings of which we discuss in this review. Studies of human tissue identify a repertoire of human primary afferent subtypes comparable to rodent models including a nociceptor population, the targeting of which will shape future analgesic development efforts. Detailed mechanistic studies in human sensory neurons combined with unbiased RNA-sequencing approaches have revealed fundamental differences in not only receptor/channel expression but also peripheral pain pathways.

The anxiolytic effect of probiotics: A systematic review and meta-analysis of the clinical and preclinical literature

Background

Probiotics have generated intensive research interest in recent years as a novel mode of treatment for physical and mental illness. Nevertheless, the anxiolytic potential of probiotics remains unclear. The present systematic review and meta-analysis aimed to evaluate the clinical and preclinical (animal model) evidence regarding the effect of probiotic administration on anxiety.

Methods

The PubMed, PsycINFO, and Web of Science databases were reviewed for preclinical and clinical studies that met the defined inclusion and exclusion criteria. The effects of probiotics on anxiety-like behavior and symptoms of anxiety were analyzed by meta-analyses. Separate subgroup analyses were conducted on diseased versus healthy animals, specific preclinical probiotic species, and clinical versus healthy human samples.

Results

Data were extracted from 22 preclinical studies (743 animals) and 14 clinical studies (1527 individuals). Overall, probiotics reduced anxiety-like behavior in animals (Hedges’ g = -0.47, 95% CI -0.77 –-0.16, p = 0.004). Subgroup analyses revealed a significant reduction only among diseased animals. Probiotic species-level analyses identified only Lactobacillus (L.) rhamnosus as an anxiolytic species, but these analyses were broadly under-powered. Probiotics did not significantly reduce symptoms of anxiety in humans (Hedges’ g = -0.12, 95% CI -0.29–0.05, p = 0.151), and did not differentially affect clinical and healthy human samples.

Conclusions

While preclinical (animal) studies suggest that probiotics may help reduce anxiety, such findings have not yet translated to clinical research in humans, perhaps due to the dearth of extant research with clinically anxious populations. Further investigation of probiotic treatment for clinically relevant anxiety is warranted, particularly with respect to the probiotic species L. rhamnosus.

Connecting Our Gut Feeling and How Our Gut Feels: The Role of Well-being Attributes in Irritable Bowel Syndrome

Background/Aims

There is a close relationship between the mind and gut in the pathogenesis of functional bowel disorders. Common psychological disturbances such as depression and anxiety are not uncommon in those with irritable bowel syndrome (IBS). There is little research investigating the role of positive psychology and gastrointestinal (GI) conditions. In this pilot study we investigated the well-being attributes in those with and without IBS.

Methods

We used an anonymous online survey and recruited 416 study subjects using social media as the main method of recruitment. We gathered demographic information, GI symptoms, history of mental health issues such as anxiety and depression, assessed several well-being attributes, and finally assessed subjective well-being. We hypothesized that those with GI symptoms and IBS have lower scores in their well-being attributes compared to healthy controls.

Results

We observed that a history of anxiety and depression is significantly associated with GI symptoms and IBS. In addition, sense of subjective well-being and several well-being attributes are negatively associated with GI symptoms and/or IBS. Of interest, the household income showed a negative correlation with the prevalence of GI symptoms and IBS.

Conclusions

Subjective well-being, and several well-being attributes that contribute to the sense of overall contentment, are negatively associated with GI symptoms and IBS. The link between subjective well-being, and GI symptoms and IBS are independent of anxiety and depression. Well-being attributes and sense of subjective well-being may be a contributory factor in clinical expression of GI symptoms or IBS consistent with the biopsychosocial model of the disease.

Comorbidity between pain and mental illness - Evidence of a bidirectional relationship

BACKGROUND

Pain from various locations in the body and mental illness are common and the comorbidity between the two is well-known although the temporal relationship remains to be determined. Our aim was to follow patients over time to study if pain (here dorsalgia/abdominal pain) or fibromyalgia lead to an increased risk of developing mental illness (here depression/anxiety) and/or the reverse, that is whether patients with mental illness have an increased risk to develop pain or fibromyalgia, compared to the rest of the population.

METHODS

This prospective cohort study used the Skåne Healthcare Register, covering all care in the region of Skåne, southern Sweden (population ~1.3 million). The cohort included healthcare consultations in primary care, outpatient specialized care and inpatient care between 2007 and 2016 for all patients without prior registered diagnosis of mental illness or pain, aged 18 or older (n = 504,365).

RESULTS

The incidence rate ratio (IRR) for developing mental illness after pain was 2.18 (95% CI = 2.14-2.22) compared to without pain. IRR for developing pain after mental illness was 2.02 (95% CI = 1.98-2.06) compared to without mental illness. Corresponding IRR for developing mental illness after fibromyalgia was 4.05 (95% CI = 3.58-4.59) and for developing fibromyalgia after mental illness 5.54 (95% CI = 4.99-6.16).

CONCLUSIONS

This study shows a bidirectional influence of similar magnitude of pain and mental illness, respectively. In monitoring patients with pain or mental illness, a focus on both conditions is thus important to develop appropriate, targeted interventions and may increase the likelihood of improved outcomes.

SIGNIFICANCE

We followed a population-based cohort over a period of 10 years, including incident cases of both exposure and outcome and found a bidirectional relationship between pain and mental illness. Clinicians need to pay attention on both conditions, in patients seeking care due to mental illness or pain.

Ex vivo study of human visceral nociceptors

OBJECTIVE

The development of effective visceral analgesics free of deleterious gut-specific side effects is a priority. We aimed to develop a reproducible methodology to study visceral nociception in human tissue that could aid future target identification and drug evaluation.

DESIGN

Electrophysiological (single unit) responses of visceral afferents to mechanical (von Frey hair (VFH) and stretch) and chemical (bradykinin and ATP) stimuli were examined. Thus, serosal afferents (putative nociceptors) were used to investigate the effect of tegaserod, and transient receptor potential channel, vanilloid 4 (TRPV₄) modulation on mechanical responses.

RESULTS

Two distinct afferent fibre populations, serosal (n=23) and muscular (n=21), were distinguished based on their differences in sensitivity to VFH probing and tissue stretch. Serosal units displayed sensitivity to key algesic mediators, bradykinin (6/14 units tested) and ATP (4/10), consistent with a role as polymodal nociceptors, while muscular afferents are largely insensitive to bradykinin (0/11) and ATP (1/10). Serosal nociceptor mechanosensitivity was attenuated by tegaserod (-20.8±6.9%, n=6, p<0.05), a treatment for IBS, or application of HC067047 (-34.9±10.0%, n=7, p<0.05), a TRPV₄ antagonist, highlighting the utility of the preparation to examine the mechanistic action of existing drugs or novel analgesics. Repeated application of bradykinin or ATP produced consistent afferent responses following desensitisation to the first application, demonstrating their utility as test stimuli to evaluate analgesic activity.

CONCLUSIONS

Functionally distinct subpopulations of human visceral afferents can be demonstrated and could provide a platform technology to further study nociception in human tissue.

Self-rated health and functional capacity in individuals reporting overlapping symptoms of gastroesophageal reflux disease, functional dyspepsia and irritable bowel syndrome - a population based study

BACKGROUND

Gastroesophageal reflux disease (GERD), functional dyspepsia (FD) and irritable bowel syndrome (IBS) are common functional gastrointestinal conditions with a significant impact on daily life. The objectives were to analyse general self-rated health and self-reported functional capacity in adults meeting the criteria for GERD, FD and IBS, respectively, and in individuals who meet the criteria for more than one of the conditions.

METHODS

A nationwide study of 100,000 individuals aged 20 years and above, randomly selected in the general Danish population. A web-based questionnaire survey formed the basis of this study. Questions regarding FD and IBS were extracted from the ROME III adult questionnaire. Questions regarding GERD were developed based on the Montreal definition. Self-rated health and functional capacity was measured by single global questions.

RESULTS

Respondents meeting the criteria for either GERD, FD or IBS have significantly higher odds of reporting poor self-rated health and impaired functional capacity compared to individuals not experiencing these functional gastrointestinal conditions. Furthermore, respondents with overlapping gastrointestinal (GI) symptom complexes have significantly higher odds of reporting poor self-rated health and impaired functional capacity compared to respondents with symptoms compatible with only one of the symptom complexes.

CONCLUSIONS

This study demonstrates that individuals experiencing symptoms of GERD, FD or IBS report poor self-rated health as well as impaired functional capacity. The impact on self-rated health and functional capacity is highest among individuals experiencing overlapping symptoms of GERD, FD and IBS.

Self-rated health and functional capacity in individuals reporting overlapping symptoms of gastroesophageal reflux disease, functional dyspepsia and irritable bowel syndrome - a population based study

BACKGROUND

Gastroesophageal reflux disease (GERD), functional dyspepsia (FD) and irritable bowel syndrome (IBS) are common functional gastrointestinal conditions with a significant impact on daily life. The objectives were to analyse general self-rated health and self-reported functional capacity in adults meeting the criteria for GERD, FD and IBS, respectively, and in individuals who meet the criteria for more than one of the conditions.

METHODS

A nationwide study of 100,000 individuals aged 20 years and above, randomly selected in the general Danish population. A web-based questionnaire survey formed the basis of this study. Questions regarding FD and IBS were extracted from the ROME III adult questionnaire. Questions regarding GERD were developed based on the Montreal definition. Self-rated health and functional capacity was measured by single global questions.

RESULTS

Respondents meeting the criteria for either GERD, FD or IBS have significantly higher odds of reporting poor self-rated health and impaired functional capacity compared to individuals not experiencing these functional gastrointestinal conditions. Furthermore, respondents with overlapping gastrointestinal (GI) symptom complexes have significantly higher odds of reporting poor self-rated health and impaired functional capacity compared to respondents with symptoms compatible with only one of the symptom complexes.

CONCLUSIONS

This study demonstrates that individuals experiencing symptoms of GERD, FD or IBS report poor self-rated health as well as impaired functional capacity. The impact on self-rated health and functional capacity is highest among individuals experiencing overlapping symptoms of GERD, FD and IBS.

Associations of Mental Health and Physical Function with Colonoscopy-related Pain

Objective To clarify the effects of mental health and physical function in association with colonoscopy-related pain. Methods The mental health and physical function were evaluated using the Japanese version of the SF-8 Health Survey questionnaire. Poor physical status was defined as a physical component summary (PCS) <40 and poor mental status as a mental component summary (MCS) <40. Pain was assessed using a visual analogue scale (VAS), with significant pain defined as VAS ≥70 mm and insignificant pain as VAS <70 mm. The background and colonoscopic findings were compared in patients with significant and insignificant pain. Patients This study evaluated consecutive Japanese patients who were positive on fecal occult blood tests and underwent total colonoscopy. Results Of the 100 patients, 23 had significant and 77 had insignificant colonoscopy-related pain. A multiple logistic regression analysis showed that MCS <40 [odds ratio (OR) 6.03; 95% confidence interval (CI) 1.41-25.9, p=0.0156], PCS <40 (OR 5.96; 95% CI 1.45-24.5, p=0.0133), and ≥300 seconds to reach the cecum (OR 4.13; 95% CI 1.16-14.7, p=0.0281) were independent risk factors for colonoscopy-related pain. Conclusion The mental health and physical function are important determinants of colonoscopy-related pain. Evaluating the mental health and physical function of patients prior to colonoscopy may effectively predict the degree of colonoscopy-related pain.

Personality traits and emotional patterns in irritable bowel syndrome

The review focuses on those personality traits (neuroticism, extraversion, openness to experience, agreeableness, and conscientiousness), constructs (alexithymia and distressed - Type D personality) and emotional patterns (negative and positive) that are of particular concern in health psychology, with the aim to highlight their potential role on the pathogenesis, onset, symptom clusters, clinical course, and outcome of irritable bowel syndrome (IBS). Personality traits and emotional patterns play key roles in affecting autonomic, immune, inflammatory, and endocrine functions, thus contributing not only to IBS clinical expression and symptomatic burden, but also to disease physiopathology. In this sense, psychological treatments should address those personality traits and emotional features that are constitutive of, and integral to IBS. The biopsychosocial model of illness applied to IBS acknowledges the interaction between biological, psychological, environmental, and social factors in relation to pain and functional disability. A holistic approach to IBS should take into account the heterogeneous nature of the disorder, and differentiate treatments for different types of IBS, also considering the marked individual differences in prevalent personality traits and emotional patterns. Beyond medications, and lifestyle/dietary interventions, psychological and educational treatments may provide the optimal chance of addressing clinical symptoms, comorbid conditions, and quality of life in IBS patients.

The crossroads of gastroenterology and psychiatry - what benefits can psychiatry provide for the treatment of patients suffering from gastrointestinal symptoms

Introduction

Gastrointestinal symptoms are very common in the general population. Many of them coincide with mental disorders (especially with neuroses, stress-related disorders, somatisation disorders, autonomic dysfunction, and anxiety) that are associated with psychological trauma, conflicts, and difficulties with interpersonal relationships.

Aim

Assessment of the association between gastrointestinal complaints and stressful situations in relationships, among patients admitted to day hospital for neurotic and behavioural disorders.

Material and methods

Analysis of the likelihood of co-occurrence of abdominal symptoms and stressful situations, reported by patients before admission, in a large group of subjects treated with psychotherapy.

Results

Gastrointestinal symptoms were highly prevalent in the studied group (they were reported by 40–50% of patients). The most common complaints in women were: loss of appetite (52%), nausea (49%), and constipation and flatulence (45%). In men the most prevalent symptoms were: loss of appetite (47%), heartburn (44%), and flatulence (43%). Functional gastrointestinal symptoms (especially vomiting in cases of nervousness in females or heartburn in males) were significantly associated with greater likelihood of current difficulties in interpersonal relationships, such as conflicts with partner/spouse or parent.

Conclusions

The results suggest that in many cases symptoms of anxiety disorders or somatisation disorders coexisted with irritable bowel syndrome and functional dyspepsia.

The association of depression and anxiety with pain: a study from NESDA

Chronic pain is commonly co-morbid with a depressive or anxiety disorder. Objective of this study is to examine the influence of depression, along with anxiety, on pain-related disability, pain intensity, and pain location in a large sample of adults with and without a depressive and/or anxiety disorder. The study population consisted of 2981 participants with a depressive, anxiety, co-morbid depressive and anxiety disorder, remitted disorder or no current disorder (controls). Severity of depressive and anxiety symptoms was also assessed. In separate multinomial regression analyses, the association of presence of depressive or anxiety disorders and symptom severity with the Chronic Pain Grade and location of pain was explored. Presence of a depressive (OR = 6.67; P<.001), anxiety (OR = 4.84; P<.001), or co-morbid depressive and anxiety disorder (OR = 30.26; P<.001) was associated with the Chronic Pain Grade. Moreover, symptom severity was associated with more disabling and severely limiting pain. Also, a remitted depressive or anxiety disorder showed more disabling and severely limiting pain (OR = 3.53; P<.001) as compared to controls. A current anxiety disorder (OR = 2.96; p<.001) and a co-morbid depressive and anxiety disorder (OR = 5.15; P<.001) were more strongly associated with cardio-respiratory pain, than gastro-intestinal or musculoskeletal pain. These findings remain after adjustment for chronic cardio respiratory illness. Patients with a current and remitted depressive and/or anxiety disorder and those with more severe symptoms have more disabling pain and pain of cardio-respiratory nature, than persons without a depressive or anxiety disorder. This warrants further research.

NPSR1 polymorphisms influence recurrent abdominal pain in children: a population-based study

BACKGROUND

Recurrent abdominal pain (RAP) occurs frequently among children and is one of the cardinal symptoms of functional gastrointestinal disorders (FGID). The mechanisms of visceral pain and RAP are not fully understood. A heritable component has been demonstrated and a few candidate genes proposed. NPSR1 encodes the receptor for neuropeptide S (NPS) and NPS-NPSR1 signaling is involved in anxiety, inflammation, and nociception. NPSR1 polymorphisms are associated with asthma and chronic inflammatory diseases, but also with IBS-related intermediate phenotypes such as colonic transit time and rectal sensory ratings. Here, we sought to determine whether genetic variability in the NPSR1 gene influences the presence of RAP in children.

METHODS

Twenty-eight single-nucleotide polymorphisms (SNPs) in the NPSR1 gene region were successfully genotyped in 1744 children from the Swedish birth cohort BAMSE. Questionnaire information was used to define RAP as episodes of abdominal pain occurring at least once a month in 12-year-olds.

KEY RESULTS

The prevalence of RAP was 9% in BAMSE. Association with RAP was observed for seven NPSR1 SNPs, five of which withstood false discovery rate (FDR) correction for multiple testing (best p = 0.00054, OR: 1.55 for SNP rs2530566). The associated SNPs all map in a putative regulatory region upstream NPSR1, where they may exert their genetic effects through the modulation of gene expression.

CONCLUSIONS & INFERENCES

Genetic variation at the NPSR1 locus impacts children's predisposition to RAP episodes in a Swedish population.

Role of negative affects in pathophysiology and clinical expression of irritable bowel syndrome

Irritable bowel syndrome (IBS) is regarded as a multifactorial disease in which alterations in the brain-gut axis signaling play a major role. The biopsychosocial model applied to the understanding of IBS pathophysiology assumes that psychosocial factors, interacting with peripheral/central neuroendocrine and immune changes, may induce symptoms of IBS, modulate symptom severity, influence illness experience and quality of life, and affect outcome. The present review focuses on the role of negative affects, including depression, anxiety, and anger, on pathogenesis and clinical expression of IBS. The potential role of the autonomic nervous system, stress-hormone system, and immune system in the pathophysiology of both negative affects and IBS are taken into account. Psychiatric comorbidity and subclinical variations in levels of depression, anxiety, and anger are further discussed in relation to the main pathophysiological and symptomatic correlates of IBS, such as sensorimotor functions, gut microbiota, inflammation/immunity, and symptom reporting.

Characteristics of functional bowel disorder patients: a cross-sectional survey using the Rome III criteria

BACKGROUND

There is some evidence that, despite attempts to classify them separately, functional bowel disorders are not distinct entities and that such divisions are artificial.

AIM

To examine this issue in a large cohort of secondary care patients.

METHODS

Consecutive, unselected adults with gastrointestinal (GI) symptoms attending out-patient clinics at two hospitals in Hamilton, Ontario were recruited. Demographic data, symptoms and presence of anxiety, depression or somatisation were collected prospectively. We used validated questionnaires, including the Rome III questionnaire, with patients categorised as having irritable bowel syndrome (IBS), functional diarrhoea or chronic idiopathic constipation (CIC). We compared data between these disorders, and measured degree of overlap between them by suspending their mutual exclusivity.

RESULTS

Of 3656 patients providing complete lower GI symptom data, 1551 (42.4%) met criteria for a functional bowel disorder. Diarrhoea-predominant IBS (IBS-D) patients were younger, and more were female, met criteria for anxiety, and reported somatisation-type behaviour, compared with functional diarrhoea. Only loose, mushy or watery stools were more common in functional diarrhoea. When mutual exclusivity was suspended, overlap occurred in 27.6%. Constipation-predominant IBS (IBS-C) patients were younger, and more were female, had never married, reported anxiety type symptoms and exhibited somatisation-type behaviour. One in five CIC patients reported abdominal pain or discomfort. All constipation symptoms were more common in IBS-C. When the mutual exclusivity was suspended, overlap occurred in 18.1%.

CONCLUSIONS

There were significant differences in demographics between individuals with functional bowel disorders. Despite this, the Rome III classification system falls short of describing unique entities.