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Table of Contents   
SYSTEMATIC REVIEW/META-ANALYSIS  
Year : 2018  |  Volume : 24  |  Issue : 3  |  Page : 141-150
Prevalence of sleep disorder in irritable bowel syndrome: A systematic review with meta-analysis


Department of Gastroenterology, Peking University Third Hospital, Beijing, China

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Date of Web Publication24-May-2018
 

   Abstract 


Background/Aims: We conducted this meta-analysis to evaluate the prevalence of sleep disorder in irritable bowel syndrome (IBS) patients and study the association between IBS and sleep disorder.
Materials and Methods: A systematic search was conducted by searching PubMed, Embase, and Cochrane library databases using the following search terms: “functional gastrointestinal disorders,” “Sleep disturbance,” “Sleep disorder,” “insomnia,” “Dysomnias,” “irritable bowel syndrome,” and “IBS.” Studies evaluating the association between IBS and sleep disorder were identified. Data analysis was conducted using meta-analysis software Comprehensive Meta-Analysis (CMA) 2.0. Heterogeneity across studies was evaluated by χ2and I2statistics. Publication bias was evaluated by funnel plot, Begg's test, and Egger's test. Sensitivity analysis was also performed by removing each single study separately.
Results: The bibliographical search yielded a total of 2866 studies. Finally, 36 studies including 63620 participants were identified. The prevalence of sleep disorder in IBS was 37.6% (95% CI: 31.4% to 44.3%) based on this meta-analysis. The pooled odds ratio was 2.618 (95% CI: 2.052% to 3.341). Publication bias was not determined. Regarding the sensitivity analysis, the outcome was stable regardless of which study was removed.
Conclusions: The prevalence of sleep disorder was higher in IBS compared to healthy controls and may be associated with the pathogenesis of IBS. The prevalence of sleep disorder in IBS may differ according to different areas, age, gender, occupation, and IBS diagnostic criteria. Further studies are needed to investigate any possible causal relationship between sleep disorder and IBS.

Keywords: Irritable bowel syndrome, meta-analysis, prevalence, sleep disorder

How to cite this article:
Wang B, Duan R, Duan L. Prevalence of sleep disorder in irritable bowel syndrome: A systematic review with meta-analysis. Saudi J Gastroenterol 2018;24:141-50

How to cite this URL:
Wang B, Duan R, Duan L. Prevalence of sleep disorder in irritable bowel syndrome: A systematic review with meta-analysis. Saudi J Gastroenterol [serial online] 2018 [cited 2018 Aug 21];24:141-50. Available from: http://www.saudijgastro.com/text.asp?2018/24/3/141/229992





   Introduction Top


Sleep disorders are common among general population,[1],[2] and are determined by self-report questionnaires, polysomnography (PSG), or actigraphy.[3] The prevalence of sleep disorders varies in different countries. A meta-analysis conducted in 2006 demonstrated a female predisposition for insomnia.[4] Sleep disorders may also contribute to various health problems.[5] An association between functional gastrointestinal disorder and sleep disturbances has been identified.[6]

Irritable bowel syndrome (IBS) is a functional bowel disorder defined by recurrent abdominal pain related to defecation or a change in the frequency or appearance of stool.[7] The prevalence varied according to geographical location and was higher among women than men.[8] The etiology of IBS remains unclear. Genetics and environmental factors, visceral hypersensitivity, gut microbiota, disorder of the gut brain axis, and psychological factors were thought to be involved.[9] Some studies have reported that sleep disorders were common in IBS patients. To our knowledge, the prevalence of sleep disorders among IBS varies from 7.1% to 73.9%. Moreover, sleep disorders may be associated with greater gastrointestinal symptom severity.[10] The global prevalence of sleep disorders among IBS has not been investigated. The aim of this meta-analysis was to identify the pooled coexistence rates of sleep disorder and IBS and to explore the association between IBS and sleep disorder.


   Materials and Methods Top


Information sources

Relevant studies were identified by searching PubMed (till March 2017), EMBASE (till March 2017), and the Cochrane Central Register of Controlled trials (Issue 3 of 12, till March 2017).

Search

The search terms used for all databases included: (Functional gastrointestinal disorders and Sleep disturbance) OR (Functional gastrointestinal disorders and Sleep disorder) OR (Functional gastrointestinal disorders and insomnia) OR (Functional gastrointestinal disorders and dyssomnias) OR (Irritable bowel syndrome and sleep disturbance) OR (Irritable bowel syndrome and sleep disorder) OR (Irritable bowel syndrome and insomnia) OR (Irritable bowel syndrome and dyssomnias) OR (IBS and sleep disturbance) OR (IBS and sleep disorder) OR (IBS and insomnia) OR (IBS and dyssomnias). The search terms were slightly modified in different databases.

Study selection

The inclusion criteria included: (1) articles reporting prevalence of sleep disorder in IBS patients and (2) available information on sleep disorder prevalence and sample size.

Data extraction

Two independent investigators extracted the data using standardized data extraction forms. Any discrepancies were resolved by consensus. The data collected included year of publication, geographic region, study design, methods for assessing sleep disorder, diagnostic criteria for IBS, prevalence of sleep disorder, mean age, occupation, and proportion of female and male participants.

Summary measures

The data analysis was performed using the Comprehensive Meta-Analysis software, Version 2 (Biosta, Inc. USA). The proportion of individuals with sleep disorder in each trial was combined to achieve a pooled prevalence of sleep disorder. Moreover, pooled odds ratios (ORs) were calculated to evaluate the association between sleep disorder and IBS. All results are presented with 95% confidence intervals.


   Synthesis of Results Top


The degree of heterogeneity of the studies was evaluated using the χ2 test (with a value less than 0.1 considered significant) and the I2 test (25, 50, and 75% representing low, moderate, and high heterogeneity, respectively). If significant heterogeneity (P < 0.1 or I2 > 50%) was achieved, we used the random effect model to combine the effect sizes in these groups. Subgroup analyses were also performed to assess the effect of geographic region, gender, occupation, age, diagnostic criteria for IBS, and publication year. To assess the stability of the results, sensitivity analysis was also performed by excluding every single study respectively. Publication bias was assessed by egger's test and funnel plots.


   Results Top


Selection of studies

A total of 2866 studies were identified, of which 2581 studies were removed according to titles and abstracts. Then, 96 duplicate studies were excluded, leaving 189 records to be examined. On reviewing full-text articles, 67 unrelated studies, 34 reviews, 3 studies including participants with complications, and 49 studies with insufficient data were excluded. Finally, 36[11],[12],[13],[14],[15],[16],[17],[18],[19],[20],[21],[22],[23],[24],[25],[26],[27],[28],[29],[30],[31],[32],[33],[34],[35],[36],[37],[38],[39],[40],[41],[42],[43],[44],[45],[46] studies including 63620 participants were identified [Figure 1] and [Table 1].
Figure 1: Flow diagram for the selection of studies

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Table 1: Characteristics of included studies of quadruple regimens versus other regimens

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The sample size of these studies ranged between 23 and 23445. Of the 36 studies, 34 studies were cross-sectional studies, 1 study was a case-control study, and 1 study was a cohort study. Furthermore, 26 studies investigated the prevalence of sleep disorder among IBS patients and evaluated the association between IBS and sleep disorder; the other 10 studies only explored the prevalence of sleep disorder among IBS patients. All these studies used subjective sleep measures to assess sleep quality.

Sleep disorders and irritable bowel syndrome

The pooled prevalence of sleep disorders among IBS was 37.6% (95% CI: 31.4% to 44.3%) [Figure 2]. A significant association was also identified between sleep disorders and IBS. The summary odds ratio was 2.618 (95% CI: 2.052% to 3.341) [Figure 3]. The results were stable no matter which study was excluded according to sensitivity analysis [Figure 4].
Figure 2: The pooled prevalence of sleep disorders among IBS

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Figure 3: The summary odds ratio of sleep disorders among IBS

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Figure 4: Sensitivity analysis

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Publication bias

No significant publication bias was identified by funnel plot [Figure 5]. Egger's regression test (P = 0.34) and Begg's test (P = 0.69) also did not show significant bias [Table 2].
Figure 5: Funnel plot

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Table 2: Results of meta-analyses/subgroup analyses

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Sleep disorders and irritable bowel syndrome based on areas

Twenty-one studies were conducted in Asia (12 in East Asia, 7 in Middle East, 1 in South Asia, and 1 in Southeast Asia). The prevalence of sleep disorders among IBS in Asia was 36.9% (95% CI: 27.7% to 47.2%). The prevalence in East Asia, Middle East, South Asia, and Southeast Asia was 38.2% (95% CI: 25.6% to 52.5%), 35.4% (95% CI: 24.5% to 48.1%), 41.1% (95% CI: 32.2% to 50.7%), and 26.2% (95% CI: 17.9% to 36.6%), respectively. The pooled OR of sleep disorders was 2.982 (95% CI: 2.250 to 3.951) among populations with IBS in Asia. The pooled ORs in East Asia, Middle East, South Asia, and Southeast Asia were 2.351 (95% CI: 1.884 to 2.934), 2.971 (95% CI: 2.068 to 4.269), 19.029 (95% CI: 11.928 to 30.357), and 2.257 (95% CI: 1.294 to 3.937), respectively.

Ten studies were conducted in America (9 studies in North America and 1 in South America). The prevalence of sleep disorders among IBS in America was 40.1% (95% CI: 30.6% to 50.4%). The prevalence in North America and South America was 37.3% (95% CI: 28.3% to 47.4%) and 67.1% (95% CI: 56.4% to 76.2%), respectively. The pooled OR of sleep disorders was 2.268 (95% CI: 1.123 to 4.582) among populations with IBS in America. The pooled ORs in North America and South America were 2.363 (95% CI: 1.081 to 5.165) and 1.666 (95% CI: 0.886 to 3.132).

Five studies were conducted in Europe (2 in Nordic Europe, 1 in Central Europe, 1 in Southern Europe, and 1 multicenter study). The prevalence of sleep disorders among IBS in Europe was 35.9% (95% CI: 24.2% to 49.6%). The prevalence in Nordic Europe, Central Europe, and Southern Europe was 47.1% (95% CI: 34.1% to 60.4%), 21.6% (95% CI: 18.0% to 25.8%), and 42.3% (95% CI: 34.4% to 50.5%), respectively. Only 2 studies conducted in Europe evaluated the association between sleep disorders and IBS (1 study conducted in Nordic Europe and 1 multicenter study). The pooled OR of sleep disorders was 1.721 (95% CI: 1.438 to 2.060) among populations with IBS in Europe.

Sleep disorders and irritable bowel syndrome based on gender

Data regarding gender were available from 10 studies. The prevalence of sleep disorders among female IBS was 43.6% (95% CI: 33.5% to 54.2%). The pooled OR of sleep disorders was 1.884 (95% CI: 1.456 to 2.438) among females with IBS. The prevalence of sleep disorders among males with IBS was 34.4% (95% CI: 27.3% to 42.3%). The pooled OR of sleep disorders was 1.601 (95% CI: 1.308 to 1.960) among males with IBS.

Sleep disorders and irritable bowel syndrome based on occupation

Data regarding occupation were available from 11 studies. Eight studies were conducted among students, 2 were conducted among nurses, and 1 was conducted among veterans. The prevalence of sleep disorders among IBS in students, nurses, and veterans were 32.2% (95% CI: 24.8% to 40.5%), 51.0% (95% CI: 42.3% to 59.7%), and 7.1% (95% CI: 3.2% to 15.0%), respectively. The pooled ORs in students, nurses, and veterans were 2.939 (95% CI: 1.676 to 5.153), 2.435 (95% CI: 1.584 to 3.742), and 0.513 (95% CI: 0.173 to 1.520), respectively.

Sleep disorders and irritable bowel syndrome based on age

Data regarding age were available from 35 studies. Thirty-two studies were conducted among adults and 3 studies were conducted among children and adolescents. The prevalence of sleep disorders was 36.4% (95% CI: 28.6% to 45.0%) among adult IBS patients and 42.4% (95% CI: 34.9% to 50.2%) among children and adolescent IBS patients. The pooled ORs were 2.403 (95% CI: 1.914 to 3.017) and 7.131 (95% CI: 1.061 to 47.922), respectively.

Sleep disorders and irritable bowel syndrome based on diagnostic criteria for irritable bowel syndrome

Among 36 identified studies, 20 used Rome III criteria, 6 used Rome II criteria, 4 used Rome I criteria, 3 used Manning criteria, and the remaining 3 did not mention specific diagnostic criteria. The prevalence of sleep disorders among IBS diagnosed by Rome III criteria, Rome II criteria, Rome I criteria, and manning criteria were 38.9% (95% CI: 33.3% to 44.8%), 37.9% (95% CI: 33.7% to 42.3%), 32.0% (95% CI: 22.8% to 42.8%), and 51.8% (95% CI: 39.0% to 64.3%), respectively. The pooled ORs were 2.741 (95% CI: 1.802 to 4.168), 3.178 (95% CI: 1.830 to 5.519), 2.303 (95% CI: 1.551 to 3.422), and 1.884 (95% CI: 0.340 to 10.448), respectively.

Sleep disorders and irritable bowel syndrome based on publication year

Five studies were published before 2000, 9 were published between 2001 and 2010, and 22 were published between 2011 and 2017. The prevalence of sleep disorders among IBS during these years were 44.8% (95% CI: 33.1% to 57.1%), 40.8% (95% CI: 34.8% to 47.0%), and 34.6% (95% CI: 25.7% to 44.7%), respectively. The pooled ORs were 1.677 (95% CI: 0.635 to 4.428), 3.093 (95% CI: 2.100 to 4.557), and 2.542 (95% CI: 1.827 to 3.536), respectively.


   Discussion Top


This is the first meta-analysis examining the prevalence of sleep disorders among IBS patients. The results of this meta-analysis involving 36 studies showed that sleep disorders were common in IBS and the prevalence rate was 37.6% (95% CI: 31.4% to 44.3%). The pooled ORs revealed that sleep disorders were significantly associated with IBS.

The reason why sleep disorders are associated with IBS remains unclear. The gut–brain axis plays an important role in the pathogenesis of IBS. Central nervous system (CNS), autonomic nervous system (ANS), enteric nervous system (ENS), and hypothalamic pituitary adrenal (HPA) axis are thought to be involved.[47] Several studies found that sleep deprivation led to modification of the ANS activity indicating that sleep disorder may be associated with autonomic dysregulation.[48],[49] The HPA axis has been reported to be inhibited by sleep and sleep disorder may result in a 24-hour increased secretion of ACTH and cortisol.[50] Moreover, the symptoms of IBS, such as abdominal pain, may activate sympathetic nervous system and reduce sleep efficiency.[51] The impact of altered microbiota on the development of IBS has been considered more seriously. Similar mechanism may exist between sleep and gut microbiota. Gut microbes may affect sleep status via degradation products such as muramyl peptides (MPs), lipopolysaccharide (LPS),[52] and melatonin.[53] These degradation products could activate immune cells leading to the release of cytokines, which could affect sleep. A recent study found short chain fat acids and microbiota metabolites might have a potential impact on central and hepatic circadian rhythm.[54] In return, circadian disorganization has been reported to alter the composition of gut microbiota under high-fat, high-sugar diet conditions in mice.[55] Chronic sleep disruption can also cause reversible changes in gut microbiota.[56] Sleep quality assessed by Pittsburgh sleep quality index was also found to be related to the composition of the gut microbiome in healthy older adults.[57] However, the results were controversial. A study reported the overall composition of gut microbiota maintained after several consecutive days of sleep restriction.[58] Overall, although the reason for sleep disorders seen commonly among IBS patients is obscure, gut–brain–microbiota axis disorder may underlie this association.

According to subgroup analysis, the prevalence of sleep disorders among IBS varied slightly in different geographical locations. We also found that the prevalence of sleep disorders among female IBS patients was higher than male IBS patients, however, the difference was not significant. Higher risk of sleep disorder and IBS in females compared with males has been reported by many studies. Sex hormones,[59] difference in visceral and somatic pain sensitivity, central processing of visceral stimuli, genetics, and immunologic/microbiome [60] may be causal factors. Occupation subgroup analysis showed that nurses with IBS might have a higher risk of suffering from sleep disorders. Part of the reason may be the demanding, stressful working conditions. Age subgroup analysis revealed that the prevalence of sleep disorders among children and adolescents with IBS was higher than that among adults, but with no statistically significant difference. Academic stress may be an explanatory factor for this observation. Different IBS diagnostic criteria may lead to differences in prevalence based on subgroup analysis. The prevalence of sleep disorders among IBS seemed to be declining on the basis of publication year subgroup analysis, however, these differences were not statistically significant.

There are some limitations of our meta-analyses. First, significant heterogeneity was found when data were pooled. Reasons for this heterogeneity may be different characteristics among identified studies. The random-effects model was used to provide a more conservative result. We hope our meta-analyses could show an epidemiologic and global perspective of the prevalence of sleep disorders among IBS patients. Second, most identified studies (34 of 36) in this meta-analysis were cross-sectional studies. We could only describe the association between sleep disorders and IBS but could not determine the cause. More case-control and cohort studies are needed to investigate the substantial causal relationship. Third, all included studies assessed sleep disorders using a subjective questionnaire. Objective measures may be more convincing.

In conclusion, this meta-analysis demonstrated a global prevalence of sleep disorders among IBS and identified an underlying association between them. Different geographical locations, age, gender, occupations, and IBS diagnostic criteria may affect the prevalence of sleep disorders in IBS. Further case-control and cohort studies are needed to elucidate a substantial causal relationship.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.



 
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Correspondence Address:
Dr. Liping Duan
No.49 North Garden Rd., Haidian District, Beijing, 100191
China
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/sjg.SJG_603_17

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    Figures

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