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Irritable bowel syndrome-like symptoms and health related quality of life two years after Roux-en-Y gastric bypass - a prospective cohort study

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Abstract

Background

Irritable bowel syndrome (IBS) is prevalent in patients with morbid obesity. After Roux-en-Y gastric bypass (RYGB) chronic abdominal pain is common, however the etiology is largely unknown. We aimed to study the change in the prevalence of IBS-like symptoms 2 years after RYGB and possible preoperative predictors of such symptoms. Secondly, to evaluate changes in symptoms of constipation and diarrhea, and Health related quality of life (HRQoL).

Methods

Patients with morbid obesity were included at two obesity centers in South-Eastern Norway. IBS was diagnosed according to the Rome III criteria. Predictors were evaluated in a multivariable logistic regression analysis.

Results

Of 307 participants operated with RYGB, 233 (76%) completed the study questionnaires. Preoperatively 27/233 participants (12%) had IBS, 2 years after RYGB 61/233 (26%) had IBS-like symptoms (p < 0.001). Eleven participants with IBS preoperatively (41%) did not report such symptoms after RYGB. New onset IBS-like symptoms was identified in 45/206 (22%) after RYGB. Fibromyalgia, low LDL levels, high vitamin B1 levels and IBS before RYGB were independent preoperative predictors of IBS-like symptoms at the follow-up visit. Symptom scores for constipation preoperatively and 2 year after RYGB were 1.5 (0.9) and 1.8 (1.2), and for diarrhea 1.4 (0.9) and 1.8 (1.1), respectively (p < 0.001). We observed a significant improvement in the physical component score for all participants. However, participants with new onset IBS-like symptoms had a significant worsening of the mental component score.

Conclusions

The prevalence of IBS-like symptoms doubled 2 years after RYGB, and these symptoms were associated with reduced HRQoL. Preoperative IBS and fibromyalgia were strong predictors of postoperative IBS-like symptoms.

Background

Irritable bowel syndrome (IBS) affects around 10% of adult populations [1]. IBS might be even more common in patients with morbid obesity [2, 3]. The core symptom of IBS is frequent abdominal pain associated with changes in bowel habits. The underlying pathophysiology is multifactorial and includes a combination of psychological factors and gut related factors (as changes in motility, inflammation or the gut microbiome) [4]. The diagnosis IBS is based on symptom-based criteria [5].

Roux-en-Y gastric bypass (RYGB) is the second most common surgical procedure applied in the treatment of morbid obesity when conservative measures have failed [6]. RYGB enables a large and sustained weight loss, improvement of obesity-related co-morbidities and health related quality of life (HRQoL), with low risk of surgical complications [7,8,9]. However, recent reports indicate that abdominal pain is common 2–5 years after RYGB [10,11,12]. Internal herniation and gallstone related disease are common causes of acute pain, whereas the etiology of chronic abdominal pain after RYGB is less well understood [13,14,15].

The primary aims of this study were to study the change in the prevalence of IBS-like symptoms from before to 2 years after RYGB and to search for preoperative predictors of these symptoms after RYGB. Furthermore we aimed to study changes in scores of constipation, diarrhea and HRQoL in all participants and in those with and without IBS-like symptoms.

Methods

Study design and setting

This is a prospective cohort study, where we invited patients with morbid obesity at the obesity centers at Oslo University Hospital (OUH) and Innlandet Hospital Trust Gjøvik (IHT-G), Norway, to participate. Participants who underwent RYGB were invited for a follow-up consultation 2 years after RYGB. Participants at OUH and IHT-G were recruited during February 2014 to June 2015, and December 2012 to September 2014, respectively. Follow-up was completed June 2017 and May 2017 at OUS and IHT-G, respectively. Subject with morbid obesity who previously has failed non-surgical measures of weigh loss were considered eligible for. Morbid obesity was defined as having a body mass index (BMI) ≥ 40 kg/m2 or BMI ≥ 35 kg/m2 with obesity-related comorbidity. Exclusion criteria for study inclusion were age younger than 18 or older than 60 years, previous bariatric surgery, other indications for RYGB than morbid obesity, simultaneous cholecystectomy, other serious disorders unrelated to obesity (including organic gastrointestinal disorder) and inability to read Norwegian language.

Surgical procedure and study visits

All RYGB operations were performed in a standardized manner, with a laparoscopic approach, a gastric pouch of about 25 ml, a 150 cm antecolic alimentary and a 50 cm biliopancreatic limb [16]. Mesenteric defects were routinely closed with non-absorbable staplers. Study visits were performed preoperatively and 2 years after RYGB. At study visits, demographics, medical history, and were registered in a predefined case report form. A routine clinical examination was performed including anthropometric measurements, and fasting blood samples were retrieved. If symptoms or clinical examination was susceptive of organic gastrointestinal disorder additional diagnostic evaluations including endoscopic examinations were made according to the clinician’s discretion. All patients filled in questionnaires for the classification of IBS, gastrointestinal symptoms and HRQoL.

Outcomes

Five demographic variables were evaluated: Age (years), gender (male/female), BMI (kg/m2), employment status (full time/not working) and cohabitant status (living with partner/not living with partner). Five co-morbid conditions were evaluated: Type 2 diabetes (T2D), hypothyroidism, hypertension, fibromyalgia, and minor psychiatric disorders (anxiety or depression). The information concerning co-morbidity was given by the participant and reviewed by a clinician with full access to the patient’s medical record. T2D was defined as HbA1c ≥ 6.5%, or the use of one or more oral glucose lowering drugs, with or without insulin treatment. Diabetes remission was defined as HbA1c < 6.5% without use of glucose lowering drugs, in a participant with prior T2D.

IBS, IBS-like symptoms, gastrointestinal symptoms and HRQoL

IBS and IBS-like symptoms were evaluated by the Rome III questionnaire in a validated translation to Norwegian [5]. Preoperatively participants who fulfilled the Rome III criteria for IBS were classified as having IBS, postoperatively participants who fulfilled the Rome III criteria for IBS were classified as having IBS-like symptoms. Our study protocol did not include supplementary examinations of participants fulfilling the Rome III criteria to explore underlying pathophysiology of IBS or IBS-like symptoms. Rome III evaluates pain and discomfort without differentiating these measures. Furthermore, participants reporting preoperative IBS did not receive any treatment addressing IBS symptoms as part of this study or to our knowledge by others. Thus the presented IBS population likely represents an untreated IBS population. Notably, no restrictions were placed on participants in regard to seeking medical attention for IBS related symptoms.

Symptoms of constipation and diarrhea were evaluated using the Gastrointestinal Symptoms Rating Scale (GSRS). The patients responded using a Likert-type scale (1 = no discomfort and 7 = severe discomfort) [17]. The GSRS-IBS questionnaire was used at IHT-G, and the GSRS at OUS. Common variables from the two questionnaires were used to calculate the constipation and diarrhea symptom scores reported in this article.

Participants from OUS reported HRQoL at the preoperative and 2 year follow-up visit, participants from IHT-G reported HRQoL only at the 2 year follow-up visit. To evaluate HRQoL the Norwegian validated translation of the 36-Item Short Form Health Survey (SF-36) version 2 was used [18]. The SF-36 questionnaires were scored using the QualityMetric Health Outcomes™ Scoring Software 4.5 giving eight health domains; physical functioning, physical role functioning, bodily pain, general health perception, vitality, social role functioning, emotional role functioning and mental health, and two summary scores; physical component score and mental component score.

Blood tests

The reference values for the fifteen variables reported in the results are as follows: hemoglobin g/dL: women 11.7–15.3, men 13.4–17.0; iron μmol/L: 9–34; ferritin μg/L: women 10–170, men 30–400; white-cell count 109/L: 3.5–10.0; c-reactive protein (CRP) mg/L: < 5; cholesterol mmol/L: age 18–29 2.9–6.1, age 30–49 3.3–6.9, age > 50 3.9–7.8; high-density lipoprotein (HDL) mmol/L: women 1.0–2.7, men 0.8–2.1; low-density lipoprotein (LDL) mmol/L: age 18–29 1.3–4.3, age 30–49 1.5–4.8, age > 50 2.0–5.4; triglycerides mmol/L: 0.5–2.6; thyroid stimulating hormone (TSH) mIE/L: 0.5–3.6; vitamin B1 nmol/liter: 95–200; vitamin B6 nmol/liter: 15–160; vitamin B12 pmol/L: 150–650; folic acid nmol/L: 7–40; glycosylated hemoglobin (HbA1c) %: 4.0–6.0.

Statistical analysis

Paired-sample t–tests or Wilcoxon rank test were used for evaluation of changes in continuous variables between preoperative and 2 year follow-up. McNemar’s test for paired proportions was used for evaluation of changes in categorical variables. For comparing subgroups independent sample t-test was used. Missing data for the GSRS item scores was imputed using the mean score of the non-missing items. Patient characteristics associated with IBS-like symptoms were studied by using independent sample t-test, the Chi Square test or Fisher exact test as appropriate.

Logistic regression analysis was performed to identify preoperative predictors of IBS-like symptoms 2 years after RYGB. Any variable associated with p < 0.25 from the univariable analysis were entered into a multivariable logistic regression model using a manual backward stepwise elimination procedure. Centre of inclusion and IBS at baseline were forced into the multivariable model. Multivariable analyses were preceded by estimation of correlation between risk factors. Predictors that correlated > 0.7, were not included in the model in order to avoid multicollinearity. The association between preoperative characteristics and IBS-like symptoms at the 2 year follow-up visit was quantified by odds ratio (OR) with 95% confidence intervals (CI). Two tailed p-values < 0.05 were considered statistically significant. All statistical analyses were made using the IBM SPSS statistics version 25.0 (IBM SPSS Inc., Armonk, NY: IBM Corp). The results are given as mean with standard deviation (SD) in brackets if not otherwise indicated.

Results

Of 307 participants operated with RYGB, 240 (78%) attended the 2 year follow-up visit and 233 (76%) filled out the study questionnaires (Fig. 1). In total 45 (19%) of 233 included participants were operated at IHT-G. Table 1 gives the participants’ characteristics at the preoperative and the 2 year follow-up visits.

Fig. 1
figure1

Flow chart describing the inclusion of participants

Table 1 Patient characteristics at the preoperative visit and the 2 year follow-up visit after Roux-en-Y-gastric bypass

Prior to the RYGB surgery 27 participants (12%) had IBS, 2 years after surgery 61 (26%) reported IBS-like symptoms (p < 0.001). 11/27 (41%) of those with IBS before RYGB did not report IBS-like symptoms after RYGB. New onset IBS-like symptoms were identified in 45/206 (22%) of participants without IBS preoperatively (Fig. 2), representing 19% of the total population at the 2 year follow-up visit.

Fig. 2
figure2

Prevalence of Irritable bowel syndrome (IBS) at the preoperative visit and IBS-like symptoms at the 2 year follow-up visit after Roux-en-Y-gastric bypass. IBS status was defined according to the Rome III criteria. The prevalence of symptoms of IBS increased from 12 to 26% (p < 0.001)

Fibromyalgia, low LDL levels, high vitamin B1 levels and IBS before RYGB were independent preoperative predictors of IBS-like symptoms at the 2 year follow-up visit (Table 2). Among participants without IBS at the preoperative visit, fibromyalgia and high vitamin B1 levels were independent preoperative predictors of IBS-like symptoms at follow-up (data not shown).

Table 2 Preoperative predictors of irritable bowel syndrome (IBS)-like symptoms 2 years after Roux-en-Y-gastric bypass (RYGB)

Symptom scores for constipation at the preoperative and 2 year follow-up visits were 1.5 (0.9) and 1.8 (1.2) (p < 0.001), and for diarrhea 1.4 (0.9) and 1.8 (1.1) (p < 0.001), respectively. Table 3 shows the changes in constipation and diarrhea scores in all participants, and stratified by IBS status. The most pronounced worsening of constipation and diarrhea symptom scores was found in the groups without IBS before RYGB and the group with new onset IBS-like symptoms after RYGB.

Table 3 Changes in constipation and diarrhea symptom scores from preoperatively to 2 years after Roux-en-Y Gastric bypass (RYGB)

Prior to RYGB, HRQoL was comparable between participants with and without IBS. At the 2 year follow-up visit participants with IBS-like symptoms had significantly lower HRQoL scores in all eight health domains and both summary scores compared to participants without IBS-like symptoms (Fig. 3). In participants with and without IBS at the preoperative visit, the improvements in the mean physical component score were 0.54 (12.8) and 7.6 (10.6) (p = 0.047) respectively and mental component scores decreased with 1.2 (10.7) and 2.6 (8.2) (p 0.67) respectively. Table 4 shows the changes in physical component score and mental component score in all participants and subgroups.

Fig. 3
figure3

Health related quality of life in participants with and without irritable bowel syndrome (IBS) and IBS-like symptoms, before and 2 years after Roux-en-Y gastric bypass (RYGB)

Table 4 Changes in Physical Component Scores (PCS) and Mental Component Scores (MCS) from preoperatively to two year after Roux-en-Y Gastric bypass (RYGB)

Discussion

The prevalence of IBS-like symptoms more than doubled 2 years after RYGB. IBS-like symptoms thus appears to be a relevant contributing factor for chronic abdominal pain and symptoms after RYGB. It has been hypothesized that low-grade inflammation could be an important cause of IBS in patients with morbid obesity [19]. In our study, the prevalence of IBS-like symptoms increased in a period where obesity-related inflammation decreased for the majority of participants, weakening this hypothesis.

Participants with preoperative fibromyalgia had four times higher odds of IBS-like symptoms after RYGB than participants without fibromyalgia. Fibromyalgia and IBS may share similar pain processing dysfunctions, such as reduced pain inhibition and aberrant autonomic nervous system responses [20,21,22]. The considerable weight reduction and the associated reduction of various obesity related symptoms after RYGB may impact the weighting of different bodily sensations (Table 1), and thus in combination with altered gastrointestinal physiology may affect the prevalence of perceived IBS-like symptoms.

Unexpectedly, high levels of vitamin B1 before RYGB was an independent preoperative predictor of IBS-like symptoms 2 year post surgery. This finding may be a proxy indicating a specific diet used by these patients or it may be a statistical type 1 bias. The finding should be further explored in future studies.

Participants with lower LDL at the preoperative visit had higher probability of IBS-like symptoms at the 2 year follow-up visit. Previous reports note an association between higher LDL and IBS both in subjects with and without obesity [23, 24]. RYGB induces structural changes in gastrointestinal tract, affects the regulation of several gut hormones including those involved in hunger and satiety, and has been shown to affect the responses of the cerebral frontoparietal control network involved in food preference regulation and non-food cues [25,26,27]. The net effect is decreased intake of food, enhanced satiety responses and a shift in food preferences from high-energy to low-energy. The pathophysiology of IBS before RYGB could thus differ from that of IBS-like symptoms post RYGB. In subjects with morbid obesity, before surgery, IBS may be more related to the diet or the lipid metabolism [24], while after RYGB IBS-like symptoms could be more related to disturbances in pain perception and altered gastrointestinal physiology.

Both constipation and diarrhea symptoms increased after RYGB, with a comparable mean change in participants with and without IBS at the preoperative visit. Previous studies have shown diverging dynamics of these symptoms after RYGB [12, 28, 29]. However, although statistically significant, the absolute changes in mean diarrhea and constipation symptom score are unlikely to be of high clinically importance (< 15% increase in symptom score), with exception of the subgroup of participants with new onset of IBS-like symptoms after RYGB who experienced a mean 33% increase for both diarrhea and constipation symptom scores.

The observed improvements in the physical functioning aspects of HRQoL after RYGB have previously been described [9, 12]. However, we are the first to describe that the improved physical functioning is irrespective of the presence of IBS-like symptoms after RYGB. Participants with and without IBS at the preoperative visit had comparable HRQoL. This was surprising, but may be due to the limited number of participants with IBS and HRQoL data available before surgery. After RYGB participants with IBS-like symptoms had significantly lower HRQoL than participants without such symptoms, in line with previous reports [30].

Of the 206 participants without IBS preoperatively 45 (22%) had new onset IBS-like symptoms 2 years after surgery. This group had a larger increase in diarrhea and constipation symptom scores and a decrease in the mental component score of SF-36 after RYGB. These findings supports an association between IBS-like symptoms after RYGB and worsened psychosocial functioning, and highlight the impact IBS-like symptoms may have on patients’ lives after RYGB [31]. The high rate of IBS-like symptoms after surgery and the reduced HRQoL associated with such symptoms should be part of the preoperative information to patients eligible for bariatric surgery and a clinical focus during follow-up, including guidance in how to reduce symptoms.

Participants with IBS before surgery had seven times higher odds for IBS-like symptoms 2 years after RYGB than those without IBS prior to surgery. However, in participants with IBS preoperatively we observed unchanged HRQoL after RYGB. And it is worth to point out that of the 27 participants with IBS preoperatively 11 (41%) no longer had IBS-like symptoms 2 years after RYGB. Therefore, IBS prior to RYGB should not be considered as an absolute contraindication for surgery.

The large numbered cohort, the high rate of follow up, and the prospective design are important strengths of our study compared to earlier reports. The use of a validated translation of the Rome III and the SF-36 questionnaires and the comprehensive evaluation of all participants are other strengths.

This study contains several major limitations. The study did not differentiate between the different functional abdominal pain syndromes. Participants fulfilling the Rome III criteria for IBS were not systematically examined for underlying pathophysiology of IBS-like symptoms. To what extent the altered physiology or other aspects of the surgical procedure itself contributed to the increase in bowel symptoms could not be answered by this study. In particular, evaluation of small intestinal bacterial overgrowth would be relevant in the evaluation of symptoms. Reporting on the use of medication at follow-up may have added information relevant for interpretation of our findings, particularly medications affecting gastrointestinal function. A control group consisting of patients undergoing other abdominal surgery could add information relevant to the interpretation of our findings.

The large number of variables imposes a risk of type 1 statistical errors. Correction for multiple testing was not performed, but all analyzed variables are presented transparently. Only participants from OUS were evaluated with SF-36 preoperatively. Gastrointestinal symptoms were evaluated with two subtypes of GSRS, thus limiting the study to only report diarrhea and constipation symptom scores for which questions in the two questionnaires were identical. A more precise diagnosis of psychiatric disorders could have strengthened the study.

Blood tests were analyzed at two local laboratories. However for paired sample tests a difference between the laboratories would not affect the results, as all patients were seen at the same center at the preoperative and the 2 year follow-up visits.

Conclusions

The prevalence of IBS-like symptoms more than doubled and was associated with reduced HRQoL after RYGB. Preoperative IBS and fibromyalgia were strong predictors of such symptoms 2 years after RYGB, yet most of the patients with IBS-like symptoms after surgery had new onset of symptoms.

Availability of data and materials

The data that support the findings of this study have been used according to the approval from Regional Committee for Medical and Health Research Ethics South East Norway and are not publicly available. Data can however be made available from the corresponding authors upon reasonable request and after permission of Regional Committee for Medical and Health Research Ethics South East Norway has been granted.

Abbreviations

BMI:

Body mass index

CRP:

C-reactive protein

GSRS:

Gastrointestinal Symptoms Rating Scale

HbA1c :

Glycosylated hemoglobin

HDL:

High-density lipoprotein

HRQoL:

Health related quality of life

IBS:

Irritable bowel syndrome

IHT-G:

Innlandet Hospital Trust Gjøvik

LDL:

Low-density lipoprotein (LDL)

OUH:

Oslo University Hospital

RYGB:

Roux-en-Y gastric bypass

SF-36:

36-Item Short Form Health Survey (SF-36)

T2D:

Type 2 diabetes

TSH:

Thyroid stimulating hormone

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Acknowledgments

We deeply appreciate the support from Marianne Sæter and Irene Ruud Johannessen at the Department of Endocrinology, Morbid Obesity and Preventive Medicine, Oslo University Hospital, for their assistance in patient recruitment and questionnaire retrieval. We thank MD, PhD Kristin Engebretsen for the help with patient follow-up.

Funding

The first author (IKBH) has received a PhD grant from South-Eastern Norway Regional Health authority, project nr 2014073. The project has received a financial grant from the Norwegian Gastroenterology Association, but had no role in the design of the study, data collection, analysis and interpretation of data or in writing the manuscript.

Author information

Study design: IKBH, MA, CB, JAK, PGF and TM. Study conduct: IKBH, MA, MCK, IE, PGF, JAK and TM. Data collection: IKBH, IE, MCK and MA. Data analysis: IKBH, MA, CB and PGF. Data interpretation: IKBH, MA, CB, JAK, PGF and TM. IKBH and CB take responsibility for the integrity of the data analysis. Drafting manuscript: IKBH, MA, PGF and TM. Revising manuscript content: IKBH, MA, MCK, CB, IE, JAK, PGF and TM. Read and approve of the final version of manuscript: IKBH, MA, MCK, CB, IE, JAK, PGF and TM.

Correspondence to Ingvild Kristine Blom-Høgestøl.

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The study was conducted in accordance with the Declaration of Helsinki and approved by the Regional Committee for Medical and Health Research Ethics South East Norway; 2013/1264 and 2012/966. Written informed consent was obtained from all participants.

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The authors declare that they have no competing interests.

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Blom-Høgestøl, I.K., Aasbrenn, M., Chahal-Kummen, M. et al. Irritable bowel syndrome-like symptoms and health related quality of life two years after Roux-en-Y gastric bypass - a prospective cohort study. BMC Gastroenterol 19, 204 (2019) doi:10.1186/s12876-019-1103-0

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Keywords

  • Irritable bowel syndrome
  • Morbid obesity
  • Roux-en-Y gastric bypass
  • Gastrointestinal symptoms
  • Fibromyalgia
  • Health related quality of life