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Abstract

BACKGROUND:

To date, a few studies indicated that probiotics are beneficial to pouchitis, but no meta-analyses summarized the outcomes of probiotics in pouchitis in detail.

OBJECTIVE:

This meta-analysis discusses probiotics in the prevention of pouchitis for patients after ileal pouch-anal anastomosis (IPAA) and the relationship between probiotics preventive effect and the duration of therapy and history.

METHODS:

PubMed, EMBASE and Cochrane Library databases were searched from inception until February 2022. Risk ratio (RR), mean difference (MD) and their 95% confidence interval (CI) were analyzed by Review Manager 5.3. The subgroup analysis was also performed to explore the agent for influencing outcomes.

RESULTS:

A total of 8 studies were included in this meta-analysis. The incidence of pouchitis in probiotics was significantly lower than that in the control (RR $=$ 0.19, 95%CI [0.12, 0.32], $P ï ¼ œ$ 0.00001), and the PDAI (pouchitis disease activity index) in probiotics was also significantly lower (MD $=$ $-$ 5.65, 95%CI [ $-$ 9.48, $-$ 1.83]). After the subgroup analysis, we found that probiotics work better in the short-term (RR $=$ 0.12, 95%CI [0.04, 0.40], $P=$ 0.0004), but may not achieve the desired effect in the long-term (RR $=$ 1.20, 95%CI [0.40, 3.60], $P=$ 0.75).

CONCLUSIONS:

Probiotics are beneficial in the prevention of pouchitis after IPAA, especially in the short-term.

Keywords

Pouchitis probiotics proctocolectomy restorative IPAA

1. Introduction

Pouchitis is a common complication after restorative proctocolectomy with ileal pouch-anal anastomosis (IPAA) seen in patients with ulcerative colitis (UC) and is a nonspecific inflammatory in the ileal pouch [1]. Over 50% of UC patients after IPAA experience pouchitis and preventive strategies are therefore of crucial importance. The pathogenesis of pouchitis is complicated. The dysbacteriosis of ileal pouch is one of the most important mechanisms [2]. An analysis of the microflora indicated that there is a great difference between pouchitis and non-pouchitis patients [3]. During pouchitis, the reduction of microflora diverse and the anaerobic to aerobic ratio are seen in pouchitis patients [4]. Some studies also indicated that sulfate-reducing bacteria, enterobacteriaceae are common bacteria associated with pouchitis [5, 6]. On the other hand, the anti-microbial treatment is an effective method for pouchitis and is superior to anti-inflammatory therapy in inducing remission in pouchitis patients [7, 8, 9]. Therefore, it is obvious that the microflora is closely related to pouchitis.

Probiotics are living microorganisms that are beneficial to host. They can regulate the tight junctions, properties of the mucus layer to maintain the intestinal homeostasis [10, 11, 12]. Laval et al. indicated that Lactobacillus rhamnosus CNCM I-3690 maintains the epithelial barrier through modulating occludin and E-cadherin in the murine model [12]. Probiotics also have an anti-microbial function to maintain intestinal balance [13]. Furthermore, some systematic reviews and meta-analyses indicated that probiotics are beneficial to the prevention and treatment of gastrointestinal disease, including the inflammatory bowel disease (IBD), irritable bowel syndrome (IBS), antibiotic associated diarrhea (AAD) [14, 15, 16].

Some meta-analyses also mentioned that probiotics are beneficial to patients after IPAA, but they did not summarize the outcomes of probiotics for them in detail [14, 17, 18]. In this meta-analysis, we discuss the efficacy of probiotics in preventing pouchitis for patients after IPAA, the short-term and long-term preventive effects, and the pouch disease activity index (PDAI) after the administration. The agents that may influence the outcomes are also discussed.

2. Methods

2.1 Search strategy

The MeSH terms “proctocolectomy, restorative”, “pouchitis”, “probiotics”, “escherichia coli”, “VSL3”, “streptococcus”, “saccharomyces”, “lactobacillus”, “bifidobacterium”, “enterococcus” and their entry terms were searched in PubMed, EMBASE and Cochrane Library databases from inception to February 2022. The study also gained from reference of relevant reviews.

2.2 Study selection

We included studies that met the following criteria. Inclusion criteria: (1) All studies reported administration of probiotics for patients after restorative proctocolectomy with IPAA. (2) All patients were without pouchitis at the study entry (PDAI $<$ 7). (3) The study recorded the data such as the number of patients with postoperative pouchitis and the PDAI score of patients without pouchitis. Exclusion criteria: (1) There is no data we need for this study. (2) The study was published as a case study or case series. (3) The study did not set the control.

The study selection was completed by two researchers. Any contradictions between the two researchers were solved by discussion or decided by a third reviewer.

2.3 Data extraction

The following data were extracted: type of study; type of probiotics; the diagnostic criteria; the start time of probiotics administration; the population of the control and probiotics; the number of patients with pouchitis in different time periods; the population of pouchitis; the PDAI scores of pouchitis-free population after treatment. The data extraction was completed by two researchers. Any contradictions between the two researchers were solved by discussion or decided by a third reviewer.

2.4 Assessing quality of included studies

The assessment quality was performed by the Cochrane Collaboration’s Tool for Assessing Risk of Bias. The quality was assessed according to the aspects as follows: random sequence generation (selection bias), allocation concealment (selection bias), blinding of participants and personnel (performance bias), blinding of outcome assessment (detection bias), incomplete outcome data (attrition bias), selective reporting (reporting bias). The assessing quality was completed by two researchers. Any contradictions between the two researchers were solved by discussion or decided by a third reviewer.

2.5 Statistical analysis

All data were analyzed by Review Manager 5.3. The risk ratio (RR) and its 95% confidence interval (CI) were estimated by the Mantel-Haenszel analysis method. The mean difference (MD) and its 95% CI were estimated by the inverse variance analysis method. The heterogeneity was evaluated by Cochrane Q test and Quantity $I^{2}$ . For Cochran’s Q text, if $I^{2}<$ 50, $P>$ 0.1, the heterogeneity is not significant, the fixed effect model is used. In contrast, the heterogeneity is significant, the random effect model is used. The effect of overall is measured by Z text, $P<$ 0.05 represented significant difference. The data represented in median with range or quartile will transfer to mean $\pm$ standard deviation (SD) by the methods provided by Wan et al. and Luo et al. [19, 20].

3. Results

3.1 Literature search results

The screening process and results are shown in Fig. 1. 1163 studies were searched from PubMed, EMBASE, Cochrane Library databases and other sources. 184 studies were removed due to duplication. 960 studies were removed according to the title and abstract. 11 studies were removed after screening through full-text based on the selection criteria. Finally, 8 studies were included in this meta-analysis [21, 22, 23, 24, 25, 26, 27, 28] (Fig. 1).

3.2 Characteristics of included studies and patients

The characteristics of the studies are shown in Table 1. 3 studies recorded the patients with past history of recurrent or chronic pouchitis and 5 studies recorded the patients without past history. The bias of the included studies is shown in Fig. 2.

3.3 The incidence of pouchitis after taking probiotics

The incidence in probiotics was significantly lower than the control (RR $=$ 0.19, 95%CI [0.12, 0.32], $P ï ¼ œ$ 0.00001). The heterogeneity between groups was negligible. ( $P=$ 0.97, $I^{2}=$ 0%, Fig. 3). In addition, the time to onset of pouchitis in the probiotic and placebo groups was compared (Fig. 4). There was a statistically significant difference between the probiotic and placebo group (RR $=$ 3.24, 95%CI [0.12, 6.35], $P=$ 0.04). It can be concluded that probiotics have a preventive effect on pouchitis and the onset of pouchitis was delayed in patients with IPAA who received probiotics compared with the control group.

3.4 The short-term and long-term preventive effects of probiotics

The probiotic group was compared to the placebo group at two time periods: 0–6 months (Fig. 5A) and

Table 1
Characteristics of the included studies

Year	Authors	Type of	Type of	Past history	Start time of	Type of	Diagnostic	Duration of	Episode/total		PDAI after treatment
		study	control		administration	probiotics (dose)	criteria	treatment	Control	Probiotics	Control	Probiotics
2003	Gionchetti et al. [21]	RCT: Placebo-controlled, Double-blind	Placebo	Without chronic or recurrent pouchitis	Within 1 week after ileostomy closure	VSL#3 (9 $\times$ 10 ${}^{11}$ viable lyophilized bacteria/day)	Pouchitis: PDAI $\geqslant$ 7	12 months	8/20	2/20	NA	NA
2006	Yasueda et al. [22]	RCT: Placebo-controlled, Double-blind	Placebo	Without chronic or recurrent pouchitis	At hospital discharge after IPAA completed.	Clostridium butyricum MIYAIRI (180 mg/day)	Pouchitis: mPDAI $\geqslant$ 4	24 months	4/8	1/7	Clinical PDAI:1.63 $\pm$ 1.11 ${}^{1}$ Endoscopic PDAI: 2.5 $\pm$ 1.41 ${}^{1}$	Clinical PDAI: 0.75 $\pm$ 0.83 ${}^{1}$ Endoscopic PDAI: 2.07 $\pm$ 1.78 ${}^{1}$
2004	Brown et al. [23]	RCT: Placebo controlled Double-blind	Placebo	Without chronic or recurrent pouchitis	NA	Bifidobacterium longum BB-536 (NA)	Pouchitis: PDAI $\geqslant$ 7	6 months	2/5	1/7	PDAI: 5.40 $\pm$ 1.17 ${}^{2}$ Clinical PDAI:1.60 $\pm$ 0.68 ${}^{2}$ Endoscopic PDAI: 2.0 $\pm$ 0.84 ${}^{2}$ Histological PDAI: 1.80 $\pm$ 0.49 ${}^{2}$	PDAI: 1.83 $\pm$ 0.91 ${}^{2}$ Clinical PDAI: 0.17 $\pm$ 0.17 ${}^{2}$ Endoscopic PDAI: 1.0 $\pm$ 0.37 ${}^{2}$ Histological PDAI: 0.67 $\pm$ 0.67 ${}^{2}$
2008	Pronio et al. [24]	RCT: Open-label	No treatment	Without chronic or recurrent pouchitis	Probiotics: 97 $\pm$ 66 ${}^{1}$ months after IPAA completed Control: 88 $\pm$ 58 ${}^{1}$ months after IPAA completed	VSL#3 (9.0 $\times$ 10 ${}^{11}$ viable lyophilized bacteria/day)	Pouchitis: PDAI $\geqslant$ 7	12 months	1/12	/16	NA	NA
2004	Gosselink et al. [25]	Cohort study	No treatment	Without chronic or recurrent pouchitis	Started immediately after IPAA completed	Lactobacillus rhamnosus GG (3.0 $\times$ 10 ${}^{11}$ live bacteria/day)	Pouchitis: PDAI $\geqslant$ 7	3 years	27/78	3/39	NA	NA

Table 1, continued
Year	Authors	Type of	Type of	Past history	Start time of	Type of	Diagnostic	Duration of	Episode/total		PDAI after treatment
		study	control		administration	probiotics (dose)	criteria	treatment	Control	Probiotics	Control	Probiotics
2000	Gionchetti et al. [26]	RCT: Placebo-controlled, Double-blind	Placebo	With chronic or recurrent pouchitis	Patients got remission after 1 month of antibiotic treatment	VSL#3 (1.8 $\times$ 10 ${}^{12}$ viable lyophilized bacteria/day)	Relapse: an increase in the clinical PDAI score of $>$ 2compared with the baseline score after antibiotic therapy, cofirmed by endoscopy and histology. Remission: clinical and endoscopic PDAI $=$ 0	9 months	20/20	3/20	PDAI: 12 (8–18) ${}^{3}$ Clincial PDAI: 4 (3–6) ${}^{3}$ Endoscopic PDAI: 4 (3–6) ${}^{3}$ Histologic PDAI: 4 (3–5) ${}^{3}$	Relapse ( $n=$ 3): PDAI: 11 (9–17) ${}^{3}$ Clincial PDAI: 3 (2–5) ${}^{3}$ Endoscopic PDAI: 4 (3–5) ${}^{3}$ Histological PDAI: 4 (3–5) ${}^{3}$ Remission ( $n=$ 17): PDAI: 0 (0–1) ${}^{3}$ Clincial PDAI: 0 (0–0) ${}^{3}$ Endoscopic PDAI: 0 (0–0) ${}^{3}$ Histological PDAI: 0 (0–1) ${}^{3}$

Table 1, continued

Year

Authors

Type of

Past history

Start time of

Type of

Diagnostic

Duration of

Episode/total

PDAI after treatment

study

control

administration

probiotics (dose)

criteria

treatment

Control

Probiotics

Control

Probiotics

2004

Mimura et al. [27]

RCT: Placebo-controlled, Double-blind

Placebo

With chronic or recurrent pouchitis

Patients got remission after 1 month of antibiotic treatment

VSL#3 (1.8

\times

{}^{12}

viable lyophilized bacteria/day)

Relapse: an increase in the clinical PDAI score of

>

2 and an increase in the endoscopic PDAI score of

>

3 compared with the baseline score after antibiotic therapy. Remission: clinical PDAI score

\leqslant

2 and endoscopic PDAI score

\leqslant

12 months

15/16

3/20

PDAI: 11 (6–14)

{}^{3}

Clinical PDAI: 3 (2–4)

{}^{3}

Endoscopic PDAI: 5 (3–6)

{}^{3}

Histological PDAI: 3 (1–4)

{}^{3}

PDAI: 2 (0–12)

{}^{3}

Clinical PDAI: 0 (0–4)

{}^{3}

Endoscopic PDAI: 1 (0–5)

{}^{3}

Histological PDAI: 1 (0–3)

{}^{3}

2006

Kühbacher et al. [28]

RCT: Placebo-controlled, Double-blind

Placebo

With chronic or recurrent pouchitis

Patients got remission after 1 month of antibiotic treatment

VSL#3 (1.8

\times

{}^{12}

viable lyophilized bacteria/day)

Remission: PDAI

\leqslant

2month

5/5

/10

RCT: random-controlled trial; NA: Not available; IPAA: Ileal Pouch-Anal Anastomosis; PDAI: Pouchitis Disease Activity Index; mPDAI: modify Pouchitis Disease Activity Index; 1. Data represent mean $\pm$ standard deviation; 2. Data represent mean $\pm$ standard error of mean; 3. Data represent median (range); PDAI: Pouchitis disease activity index mPDAI: modified Pouchitis disease activity index NA: Not available.

Figure 1.

Flowchart for study selection.

Figure 2.

Risk of bias in the included studies.

Figure 3.

Risk ratio (RR) for the pouchitis rate after administration of probiotics.

Figure 4.

Risk ratio (RR) for the time to onset of pouchitis in patients in the probiotic and placebo groups.

6–12 months (Fig. 5B). Due to the limitation of data, patients with pouchitis in different time periods were all diagnosed for the first time during the study period, and patients with recurrent or chronic pouchitis were not included in the number of patients in the next period. During 0–6 months, the probiotics group had a significant preventive effect on pouchitis compared with the placebo group, and the incidence of pouchitis was statistically significant between the two groups (RR $=$ 0.12, 95%CI: [0.04, 0.40], $p=$ 0.0004). However, there was no significant difference in the incidence of pouchitis between 6 and 12 months (RR $=$ 0.68, 95%CI: [0.21, 2.22], $p=$ 0.52). Due to the limited time of inclusion, we could not make a longer term comparison between the two groups. Based on the above results, it was found that there was a difference in the number of cases of pouchitis between the probiotic group and the placebo group in the first six months and no difference in the latter six months. Probiotics did not achieve the expected effect in the latter six months, but the reasons may be various.

Figure 5.

(A) Risk ratio (RR) for the pouchitis rate after administration of probiotics between 0 and 6 months; (B) RR for the pouchitis rate after administration of probiotics between 6 and 12 months.

3.5 The history of chronic or recurrent pouchitis and probiotics prevention effect

We performed a subgroup analysis based on past history (patient with or without chronic or recurrent pouchitis), duration of treatment, type of control (placebo or no treatment) and type of probiotics (Table 2). The results showed that the subgroup difference was significant after subgroup analysis according to the past history of chronic or recurrent pouchitis, but not significant based on the other agents. Subgroup analysis was performed on the number of patients with pouchitis in the probiotic group and the placebo group according to the presence or absence of previous history of chronic or recurrent pouchitis (Fig. 6). There was statistically significant difference between the probiotic group and placebo group regardless of prior history ((RR $=$ 0.14, 95%CI [0.06, 0.29], $P<$ 0.00001); (RR $=$ 0.19, 95%CI [0.11, 0.31], $P<$ 0.00001)). We also discussed the PDAI after probiotics administration (Fig. 7A). PDAI in probiotics is significantly smaller than in the control (MD $=$ $-$ 5.65, 95%CI [ $-$ 9.48, $-$ 1.83]). The same outcomes are also seen in clinical (Fig. 7B), endoscopic (Fig. 7C) and histological PDAI (Fig. 7D). There was a significant heterogeneity in PDAI, clinical PDAI and endoscopic PDAI, but not in histological PDAI (RR $=$ $-$ 1.13, 95%CI [ $-$ 2.76, 0.50], $P=$ 0.17). Since only one study was included in this group, the data bias was significant and the results were not considered reliable. Therefore, from the perspective of data analysis, it cannot be considered that the presence or absence of a history of chronic or recurrent pouchitis has a significant impact on the effect of probiotics in preventing pouchitis.

Table 2
Subgroup analysis of outcomes for probiotics in the prevention of pouchitis

	Subgroup	RR, 95% CI	Heterogeneity	$P$	Test for subgroup differences:
Past history	With chronic or recurrent pouchitis	17.72 [4.67, 67.28]	$I^{2}=$ 0%, $P=$ 0.81	$P<$ 0.0001	$P=$ 0.0002, $I^{2}=$ 92.8%
	Without chronic or recurrent pouchitis	1.37 [1.18, 1.60]	$I^{2}=$ 12%, $P=$ 0.34	$P<$ 0.0001
Duration of	2 months	11.45 [0.80, 163.26]		$P=$ 0.07	$P=$ 0.17, $I^{2}=$ 35.9%
administration	6 months	1.43 [0.66, 3.11]		$P=$ 0.37
	9 months	35.00 [2.25, 544.92]		$P=$ 0.01
	12 months	1.90 [0.70, 5.15]	$I^{2}=$ 92%, $P<$ 0.00001	$P=$ 0.21
	24 months	1.33 [0.58, 3.07]		$P=$ 0.5
	36 months	1.43 [1.15, 1.77]	$-$	$P=$ 0.001
Type of control	No treatment	1.25 [0.94, 1.67]	$I^{2}=$ 73%, $P=$ 0.06	$P=$ 0.13	$P=$ 0.09, $I^{2}=$ 64.8%
	Placebo	3.12 [1.12, 8.70]	$I^{2}=$ 82%, $P<$ 0.0001	$P=$ 0.03
Type of probiotics	VSL#3	4.14 [1.03, 16.57]	$I^{2}=$ 95%, $P<$ 0.00001	$P=$ 0.05	$P=$ 0.52, $I^{2}=$ 0%
	Lactobacillus rhamnosus GG	1.43 [1.15, 1.77]	$-$	$P=$ 0.001
	Clostridium butyricum MIYAIRI	1.33 [0.58, 3.07]		$P=$ 0.5
	Bifidobacterium longum BB-536	1.43 [0.66, 3.11]		$P=$ 0.37

RR: Risk ratio, CI: Confidence interval.

Figure 6.

Subgroup analysis of previous history of chronic or recurrent pouchitis.

Figure 7.

Pouchitis disease activity index (PDAI) after the administration of probiotics. A. PDAI; B. Clinical PDAI; C. Endoscopic PDAI; D. Histological PDAI.

4. Discussion

Dysbiosis of the ileal pouch microbiota is a hypothesis about pathogenesis of pouchitis [2]. During pouchitis, the abundance of Enterobacteriaceae is increased and the abundance of Bacteroides and F. prausnitzii, which have an anti-inammatory effect, were decreased [4, 29]. There are a few meta-analyses regarding the efficacy of probiotics in administration of pouchitis. Elahi et al. indicated that probiotics are beneficial to management in pouchitis [17]. Shen et al. showed that VSL#3, a common production used in UC patients containing four strains of lactobacilli, three strains of bifidobacteria, and one strain of streptococcus, is beneficial to maintaining remission for patients with pouchitis [14]. VSL#3 has been shown to be effective in the prevention of pouchitis onset [36]. Singh et al. also showed that VSL#3 is beneficial to preventative therapy for patients after IPAA [18]. However, they did not discuss the agents which may influence outcome of probiotics for pouchitis. In this meta-analysis, we discussed the efficacy of probiotics in preventive therapy for patients after IPAA based on the number of pouchitis rate and PDAI score after administration of probiotics, and the short-term and long-term effects of probiotics was also discussed.

During the administration of probiotics, we found that patients after treatment are less likely to be attacked by pouchitis than the control group. The PDAI in probiotics group was also lower than the control. This indicates that probiotics prevent the episode of pouchitis for patients after IPAA, which is in line with previous meta-analyses. Then we performed the subgroup analysis based on type of probiotics, the duration of treatment, past history of chronic or recurrent pouchitis and type of control. We found that the past history of chronic or recurrent pouchitis was not a significant factor in the preventive effect of probiotics on pouchitis. However, we found that probiotics have a protective effect on pouchitis, but this prevention may differ in the short-term and long-term. Probiotics did not achieve the expected effect in the latter six months, but the reasons may be various. First, 6 months after surgery may be the peak period of pouchitis, and the incidence of pouchitis is higher than that after 6 months. However, the incidence of the two groups in the included study was not very high, leading to the possibility of bias error in the above data analysis results. Secondly, probiotics may be considered to have less effect in the long-term prevention of pouchitis. Long-term use of probiotics may reduce the effect on intestinal flora, or there is a possibility that long-term use may lead to intestinal adaptation to probiotics. Probiotics can promote the strengthening of the intestinal barrier, reduce inflammation, and improve intestinal barrier function by restoring mucus layer thickness, tight junction protein, and producing specific antimicrobial and bioactive lipids with anti-inflammatory properties [30]. It is not excluded that long-term use of probiotics may lead to a decrease in the effect of probiotics on the intestinal barrier. At present, the differences between the short-term and long-term effects of probiotics still need to be further discussed. However, it is undeniable that probiotics have preventive and therapeutic effects on pouchitis, and it is not certain whether the rebound phenomenon will occur after taking probiotics in the short-term, so whether patients should only take probiotics in a short period of time after IPAA has not been concluded.

Probiotics were also used in patients during pouchitis. However, we did not summarize these studies by meta-anlaysis because most studies on patients during pouchitis did not meet the criteria of meta-analyses. The efficacy of probiotics in patients during pouchitis was controversial. Gionchetti et al. indicated that VSL#3 effective for active pouchitis [31]. However, many studies indicated that patients cannot get clinical or endoscopic response after administration of probiotics [33, 34]. We think the successful colonization of probiotcs is a key to treatment. In Gionchetti’s study, S. thermophilus, lactobacilli, bifidobacteria was significantly increased in feces after administration of probiotics [31, 32]. Kuisma et al. indicated that the microbial flora did not have significant difference between before and after administration of probiotics, in which the patients did not have clinical response [34]. The oxidative stress often occurred in inflammatory response, which link to the dysbiosis in IBD [35, 36, 37]. Most probiotics belong to anaerobic bacteria. So inflammatory environment influences the colonization of probiotics, and the “warfare” between Reactive Oxygen Species (ROS) and probiotics may influence the efficacy of probiotics. In contrast, due to the less ROS produced in non-inflammatory pouch, colonization of probiotics in pouch is much easier. This provides a prerequisite for the good efficacy of probiotics in patients during no inflammation in pouch.

This meta-analysis is not without limitations. First, the number of included studies and patients was small, which limited further investigation into probiotics for pouch patients. Secondly, some continuous variables in the original studies did not represent in mean $\pm$ SD, which needed to be transfered through the method offered by Luo et al. and Wan et al. [19, 20]. Even though the credibility of this method has been proven, a bias in continuous variables is unavoidable. Lastly, the quality of included studies was not high, so more highly quality studies are needed for analysis.

5. Conclusion

Probiotics are beneficial to preventative therapy for patients after restorative proctocolectomy with ileal pouch-anal anastomosis. Long-term use of probiotics in the prevention of pouchitis is lower than short-term use, which may be difficult to achieve expectations, but there is no consensus on whether patients after IPAA should use probiotics only for the short-term.

Ethics statement

This study was exempt from ethics approval. Informed consent was obtained from all individual participants included in the study.

Availability of data and materials

The data used or analysed during the current study are available from the corresponding author on reasonable request.

Funding

None to report.

Author contributions

GL: Conceived and designed the study.

WX, XZ: Collected and analyzed the data and wrote the first draft of the paper.

CL, QH: Supervised the data collection process and assisted with writing the paper.

AH: Contributed to the revision of the paper and approved the final version.

Footnotes

Acknowledgments

None to report.

Conflict of interest

The authors have no competing interest to report.

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The efficacy of probiotics on the prevention of pouchitis for patients after ileal pouch-anal anastomosis: A meta-analysis

Abstract

BACKGROUND:

OBJECTIVE:

METHODS:

RESULTS:

CONCLUSIONS:

Keywords

1. Introduction

2. Methods

2.1 Search strategy

2.2 Study selection

2.3 Data extraction

2.4 Assessing quality of included studies

2.5 Statistical analysis

3. Results

3.1 Literature search results

3.2 Characteristics of included studies and patients

3.3 The incidence of pouchitis after taking probiotics

3.4 The short-term and long-term preventive effects of probiotics

Table 1 Characteristics of the included studies

Table 2 Subgroup analysis of outcomes for probiotics in the prevention of pouchitis

5. Conclusion

Ethics statement

Availability of data and materials

Funding

Author contributions

Footnotes

Acknowledgments

Conflict of interest

References

Table 1
Characteristics of the included studies

Table 2
Subgroup analysis of outcomes for probiotics in the prevention of pouchitis