The Bacterial Pathogenesis and Treatment of Pouchitis

[David in Seattle]

The Bacterial Pathogenesis and Treatment of Pouchitis

S. D. McLaughlin, MBBS, MRCP; S. K. Clark, MD, FRCS; P. P. Tekkis, MD, FRCS; R. J. Nicholls, MChir, FRCS; P. J. Ciclitira, PhD, MD, FRCP
Ther Adv Gastroenterol. 2010;3(6):335-348. © 2010 Sage Publications, Inc.

Abstract

Restorative proctocolectomy (RPC) with ileal pouch-anal anastomosis is the operation of choice for patients with ulcerative colitis. Pouchitis is the most common cause of pouch dysfunction. Although the pathogenesis of this disease is not well understood, bacteria have been implicated in the disease process. Numerous bacterial studies have been reported over the last 25 years with few unifying findings. In addition, many different treatments for pouchitis have been reported with varying results. Antibiotic treatment remains the most studied and is the mainstay of treatment. In this article we review the aetiology of pouchitis and the evidenced-based treatment options.

Background

Restorative proctocolectomy (RPC) with ileal pouch-anal anastomosis is the operation of choice for patients with ulcerative colitis (UC) who require surgery and is also performed in selected patients with familial adenomatous polyposis (FAP). After surgery most patients experience a satisfactory functional outcome. Inflammation of the ileoanal reservoir (pouchitis) is the most common long-term complication. Pouchitis is diagnosed when histologically proven acute inflammation is associated with symptoms of frequency, urgency and liquid stool in the presence of endoscopic evidence of inflammation [McLaughlin et al. 2008b]. The incidence of pouchitis is markedly different between patients with UC and FAP. In UC the quoted incidence varies from 20% to 50% between studies [Hahnloser et al. 2007; Romanos et al. 1997; Stahlberg et al. 1996]. In FAP the incidence of pouchitis is much lower than in UC and varies from 0% to 11% [Barton et al. 2001; Nyam et al. 1997; Kartheuser et al. 1996; Fazio et al. 1995; Dozois et al. 1989]. This large interdisease variation in incidence is explained by the differences in definition and length of follow up. Some studies have based the diagnosis on symptoms alone whereas others correctly have required a triad of symptoms, endoscopic findings and compatible histology. Since the risk of pouchitis increases over time, studies of a longer duration are more likely to demonstrate a higher incidence of pouchitis.

About 39% of patients who develop pouchitis will have a single episode which is easily treated and does not recur. The remaining 61% will suffer at least one further episode [Lohmuller et al. 1990] and about 5–19% of patients will develop chronic relapsing pouchitis [Madiba and Bartolo, 2001; Mowschenson et al. 2000; Hurst et al. 1998]. In this article we review the aetiology of pouchitis and the evidenced-based treatment options.

The Aetiology of Pouchitis
Pathological Similarities to Ulcerative Colitis and Crohn's Disease

Similarly to UC and Crohn's disease (CD) the mucosal inflammation that occurs in pouchitis is localized to the areas with the highest concentration of bacteria. There is a tenfold increased risk of pouchitis in patients who undergo RPC for UC compared with FAP. Therefore, it has been suggested that pouchitis represents reactivation of UC in the colonized small bowel of the pouch.

Prepouch ileitis (PPI; small intestinal inflammation proximal to the pouch inlet) is known to occur in some RPC patients with UC [Slatter et al. 2008; Calabrese et al. 2007; Iwata et al. 2007; Kuisma et al. 2004]. The pathogenesis of PPI has not been studied. Ischaemia [Bell et al. 2006], CD and nonsteroidal anti-inflammatory drugs (NSAIDs) [Shen et al. 2006; Wolf et al. 2004] have been implicated in some cases, but where these factors have been excluded the pathogenesis is likely to be similar to that of pouchitis where bacteria are considered fundamental to the disease process. It is possible that reflux of pouch contents into the prepouch ileum analogous to backwash ileitis in UC, a higher bacterial load or more pathogenic bacteria may be responsible for the disease process. Evidence for this comes from knowledge that the antibiotic therapy is an effective treatment [McLaughlin et al. 2008a] and that PPI appears to be a risk factor for developing antibiotic resistance in patients treated with maintenance antibiotic therapy [McLaughlin et al. 2009b]. One group has suggested that inflammation proximal to the pouch is indicative of CD or associated with the use of NSAIDs [Shen et al. 2006;Wolf et al. 2004]. This study included 87 patients with available colectomy histology including 28 with UC, 32 with indeterminate colitis and 27 with CD. Only 5 UC patients had signs of PPI, all of whom were taking NSAIDs. Therefore, the study did not assess UC patients with PPI who were not taking NSAIDs. Recent work by our group has demonstrated that histologically PPI is a distinct entity which can be differentiated from CD [Bell et al. 2006] and it is therefore possible that PPI is similar to backwash ileitis seen in UC, providing evidence of similarity to UC

Despite this there are several similarities between pouchitis and CD. Both are inflammatory conditions which can affect the small bowel, both respond to treatment with antibiotics and both improve with diversion of the faecal stream (importantly these treatments are not effective in UC). There is also evidence at an immunological level that pouchitis has a similar pathogenesis to CD. In UC inflammation is predominately Th2-cytokine driven, whereas in CD a Th1-mediated immune response dominates [Fiocchi, 1998; Gately et al. 1998; Sartor, 1991; Wolf et al. 1991; Kobayashi et al. 1989]. It might therefore be expected that pouchitis would be associated with a Th2-cytokine activation, but an increase in the Th1 cytokine interferon gamma (IFN-γ) has been described in acute and chronic pouchitis [Stallmach et al. 1998]. Our group has previously investigated the association between CD30 and pouchitis. CD30 was shown to be upregulated in UC but not in CD [Elewaut et al. 1998; Giacomelli et al. 1998]. In this study CD30 was elevated in acute pouchitis but not in those with chronic pouchitis [Thomas et al. 2001] and therefore it was postulated that this may be due to a more CD-type disease occurring in these individuals.

Evidence for Pouchitis Being a Novel Third Form of Inflammatory Bowel Disease

It has been suggested that pouchitis may represent a novel third form of inflammatory bowel disease (IBD) [Sandborn and Pardi, 2004]. The differences in treatment response seen in pouchitis patients compared with UC and CD could be considered to fit with this. Although antibiotics are of some clinical benefit in CD, they are much less so than in pouchitis where they are more effective than any other therapy. Interestingly there is no evidence that immunomodulators are effective in pouchitis (we return to this later) suggesting that the pathogenesis of the disease may differ from that of UC and CD where these agents are very effective.

 

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The Dysbiosis Theory

An abnormal host–microbial interaction has long been implicated in all forms of IBD including pouchitis [Sartor, 2008]. There is evidence from clinical practice to implicate bacteria in pouchitis. In common with UC and CD, mucosal inflammation is localized to the area of gut with the highest concentration of bacteria [Sartor, 2008], antibiotics are effective treatment for both pouchitis and PPI [McLaughlin et al. 2008a; Shen et al. 2007a; Madden et al. 1994] and probiotics have been shown to reduce disease relapse [Mimura et al. 2004; Gionchetti et al. 2000], reduce the risk of disease onset [Gionchetti et al. 2005] and to be effective in mild to moderate pouchitis [Gionchetti et al. 2007a].

Based on the response of peripheral and local mononuclear cells our group has previously demonstrated that the inflammatory response in pouchitis appears to be at the local mucosal level and is not a general systemic reaction [Thomas et al. 2002] and that pouchitis-derived bacterial sonicates from metronidazole-sensitive bacterial species can stimulate healthy patients' mononuclear cells significantly more than corresponding sonicates from nonpouchitis patients [Bell et al. 2004]. Both studies providing indirect evidence to implicate bacteria and justify studies of ileoanal pouch microbiota.
Studies of Pouch Microbiota

The interpretation of early work to establish the potential differences in bacterial microbiota between pouchitis and nonpouchitis patients is limited by the lack of universally accepted criteria for pouchitis prior to the Moskowitz score being described in 1986 [Moskowitz et al. 1986] and the pouch disease activity index (PDAI) in 1994 [Sandborn et al. 1994]. Many of these early studies were also limited by comparing well-functioning with poorly functioning pouches rather than nonpouchitis and pouchitis groups. In addition a further limitation of many studies was that many of the patients with a history of pouchitis were asymptomatic at the time of the study [Lim et al. 2006]. The majority of studies to establish the microbiota of the ileoanal pouch have been performed using culture methods, but it is now known that less than 50% of gut bacterial species can be cultured [Hayashi et al. 2002; Suau et al. 1999].

Estimates of the presence of 200–300 colonic species derived from culture-based studies have been revised to about 15, 000–36, 000 individual species following the introduction of 16s ribosomal RNA polymerase chain reaction (PCR) techniques [Frank et al. 2007]. There are several different PCR techniques each with a different sensitivity. Cloning and high-throughput sequencing of the 16 s gene is currently accepted as the 'gold standard' molecular method [Zoetendal et al. 2008; Lim et al. 2006] and therefore modern research should use molecular rather than culture-based techniques.
Studies Using Culture Methods

Details of each of the culture studies are summarized in Table 1 and Table 2.

Nicholls and colleagues studied 14 patients who had undergone RPC at least 6 months earlier, seven patients had inflammation of the reservoir and seven did not [Nicholls et al. 1981]. Inflammation of the reservoir was associated with a higher count of aerobic but not anaerobic bacteria.

Santavirta and colleagues studied faecal samples from 30 UC patients after RPC and 10 with a conventional ileostomy [Santavirta et al. 1991]. Nine had a history of pouchitis defined as increased stool frequency, bleeding and abdominal cramping, however only three of these patients were symptomatic at the time of the study and only two with a history of pouchitis had faecal samples analysed. The authors found no difference in the numbers of anaerobes and aerobes in those with a history of pouchitis compared with those who had no history of pouchitis but did report an increase in the total bacterial counts, numbers of anaerobes and ratio of anaerobes to aerobes compared with patients with a conventional ileostomy.

Ruseler-van Embden and colleagues studied faecal samples of 14 RPC patients (12 UC; 2 FAP) [Ruseler-van Embden et al. 1994]. Pouchitis was defined by clinical, endoscopic and histological criteria. Five were classified as having pouchitis and nine nonpouchitis. Of the former two were symptomatic when studied. There was no difference in the total numbers of bacteria between pouchitis and nonpouchitis patients but an increase in the number of aerobes was found. Clostridium perfingens was present in over 75% of the pouchitis and in less than 25% of the nonpouchitis samples. Bifidobacterium and Lactobacillus were found in only one pouchitis sample but were present in 84% of nonpouchitis samples.

Duffy and colleagues studied 25 patients (10 UC RPC, 7 FAP RPC, 8 ileostomy) none of whom had a previous history of pouchitis [Duffy et al. 2002]. In the UC RPC patients 80% of the samples contained sulphate-reducing bacteria (SRB) in contrast to none of the FAP or ileostomy samples. The authors found no significant difference between UC and FAP in counts of Lactobacilli, C. perfingens, Bacteriodes and Bifidobacterium or enterococci and coliforms.

Sandborn and colleagues cultured the stool from 30 patients (10 UC RPC non-pouchitis, 10 UC RPC pouchitis, 5 FAP RPC non-pouchitis and 5 ileostomy) [Sandborn et al. 1995]. Pouchitis was defined as a PDAI≥7. The authors found a higher ratio of anaerobic Gram-negative rods in RPC compared with ileostomy patients and there were no differences between pouchitis and non-pouchitis samples in FAP and UC RPC.

A study was carried out by Ohge and colleagues of 50 patients including 9 UC RPC with previous pouchitis but no active disease for 1 year, 9 UC RPC with pouchitis in the last year, but inactive for 6 weeks or more, 8 UC RPC more than 2 years ago and no previous pouchitis and 11 UC RPC pouchitis with ongoing antibiotic treatment [Ohge et al. 2005]. Stool samples were collected, and counts of SRB and output of hydrogen sulphide were measured. The authors found a fivefold greater release of hydrogen sulphide in all UC samples compared with the FAP samples except in the UC patients receiving antibiotic treatment, where there was no difference to the FAP group. Patients who had recently had pouchitis had a higher hydrogen sulphide production than those who had pouchitis more than 1 year previously which was higher than those who had never had pouchitis. SRB counts were higher in samples from active pouchitis patients than all other groups. Gosselink and colleagues cultured faecal samples from 13 patients with active pouchitis prior to antibiotic treatment, during treatment and following treatment. A comparison with nonpouchitis patients was not undertaken. They found that during an episode of pouchitis there was an increase in aerobes and decrease in anaerobes [Gosselink et al. 2004].

Kuisma and colleagues studied faecal microbiology and mucosal microbiology in 32 patients (11 nonpouchitis and 21 with a previous history of pouchitis) [Kuisma et al. 2003]. No patient had active pouchitis. The authors found a significantly increased total number of faecal anaerobic and aerobic bacteria in patients with a history of pouchitis as compared with nonpouchitis patients, but no difference in the bacteria from mucosal samples.

Kmiot and colleagues studied 46 UC patients (10 end ileostomy, 12 RPC pouchitis, 12 nonpouchitis good function and 12 nonpouchitis poor function) [Kmiot et al. 1993]. Pouchitis was defined as endoscopic and histological inflammation and patients did not need to be symptomatic. Bacterial counts of stool samples were performed on 6 non-pouchitis and 6 pouchitis patients before and following metronidazole. The authors found no significant difference in the total aerobic or anaerobic bacterial counts between the non-pouchitis and pouchitis groups, there were also no differences between the numbers of Escherichia coli, Streptococcus faecalis or Bacteriodes in each group. Bacteriodes were not present in any samples following metronidazole. There was no significant difference in counts of E. coli or S. faecalis between the pouchitis and nonpouchitis groups following metronidazole.

O'Connell and colleagues studied 20 UC patients (8 nonpouchitis with good function, defined as <6 stools per 24 h, 6 nonpouchitis poor function, defined as >6 stools per 24 h, and 6 pouchitis, defined as episodic bloody diarrhoea and malaise) [O'Connell et al. 1986]. Three patients had active pouchitis and three did not. Jejunal aspirates and stool samples were analysed. There was no difference in the numbers of aerobic and anaerobic bacteria between the pouchitis and nonpouchitis groups in the jejunal aspirates and the values were within the normal range for healthy controls. Stool culture showed overgrowth of both aerobic and anaerobic bacteria in all samples compared with values for ileal chyme in health. There were no differences between the pouchitis and nonpouchitis groups. Iwaya and colleagues cultured stool samples from 22 UC RPC patients (9 pouchitis, 13 nonpouchitis) [Iwaya et al. 2006]. Pouchitis was diagnosed using the PDAI. The authors found a significant reduction in the Bifidobacteria, Bacteriodaceae and Lactobacillus in the pouchitis group.

 

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Table 1. Studies comparing the microbiota of UC pouchitis with nonpouchitis patient samples.



UC, ulcerative colitis; FAP, familial adenomatous polyposis; RPC, restorative proctocolectomy with ileal pouch-anal anastomosis; PDAI, pouch disease activity index.

Table 2. Studies comparing the microbiota of UC with FAP patient samples (no pouchitis group).



UC, ulcerative colitis; FAP, familial adenomatous polyposis; RPC, restorative proctocolectomy with ileal pouch-anal anastomosis; PDAI, pouch disease activity index; SRB, sulphate-reducing bacteria.

 

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Studies Using Molecular Methods

Falk and colleagues studied two UC RPC patients from the time of stoma closure for 1 year with repeated mucosal biopsies using terminal restriction fragment length polymorphism (T-RFLP), cloning and sequencing [Falk et al. 2007]. Neither patient developed pouchitis during this time. They found that the microbiota evolved during this time and differed between the two patients. The microbiotal composition was similar to normal colon except for the presence of Clostridium perfringens and Turicibacter. Kuhbacher and colleagues studied the differences in microbiota between patients with chronic pouchitis who were treated with the probiotic VSL#3 and those treated with a placebo following a successful remission induced by antibiotic treatment with ciprofloxacin and metronidazole [Kuhbacher et al. 2006]. This study did not compare nonpouchitis and pouchitis microbiota and did not study the microbiota of pouchitis patients before antibiotic therapy. The authors used real-time PCR, denaturing gel gradient electrophoresis (DGGE) and fluorescent in-situ hybridization (FISH) to study the microbiota. Patients who relapsed on placebo had a lower bacterial diversity and increased fungal diversity than those who maintained remission with VSL#3, with an increase in the diversity of Lactobacilli and Bifidobacteria species. However, the authors stated that the methods used did not reliably identify all bacteria present.

Casadesus and colleagues studied the possible role of Cytomegalovirus (CMV) in pouchitis; 34 UC RPC patients were studied [Casadesus et al. 2007]. Pouchitis was diagnosed using the modified PDAI [Shen et al. 2003] and Japanese classification of pouchitis (JCP) [Fukushima et al. 2007]. The JCP defines pouchitis as a condition with severe endoscopic findings or with two or more clinical symptoms and moderate endoscopic findings. Endoscopic biopsies from the pouch mucosa were taken on multiple occasions in each patient resulting in a total of 473 specimens (103 pouchitis patients, 370 nonpouchitis patients). CMV was detected in both pouchitis and nonpouchitis biopsies using PCR and sequencing and no significant difference was found in the incidence of CMV in each group when classified using the modified PDAI. CMV was, however, present in significantly more samples from pouchitis than from nonpouchitis patients when classified using the JCP. All pouchitis biopsies with CMV detected were obtained during the first episode of pouchitis, and in earlier samples from the same patients suggesting that CMV infection causes symptoms similar to pouchitis but is not the cause of pouchitis.

Four studies have used a molecular biological method to establish the differences between the microbiota in pouchitis and nonpouchitis patients. In the first Komanduri and colleagues studied ileal pouch biopsies and faecal samples from 33 patients (13 non-IBD patients, 5 UC pouchitis, 15 non-pouchitis) [Komanduri et al. 2007]. Pouchitis was classified using the PDAI. Ileal biopsies were taken from non-IBD patients who had an intact colon. Length heterogeneity PCR (LH-PCR) was performed and output data were expressed as electropherograms with the peaks representing different populations of microbiota with amplicons of different length in base pairs. Because this technique provides limited information about the bacterial differences at a species/phylotype level, the LH-PCR products from three non-IBD controls, five UC nonpouchitis and three UC pouchitis patients were pooled and cloned. Data were then filtered so that only phylotypes representing more than 5% of the total clone library were analysed. The authors reported an increase in the bacterial diversity in pouchitis samples compared with non-IBD controls, an increase in the proportion of Enterobacters and Fusobacter (proteobacteria), reduction in Streptococci (firmicutes) and a difference in the Rumicoccus species associated with pouchitis (R. obeum) and nonpouchitis (R. gnavus).

The use of pooled data for each of the disease groups was a significant source of error in this study. Since it is known that there is a wide variation in gut microbiota between individuals [Zoetendal et al. 2008; Komanduri et al. 2007], comparisons can only be made between groups when the data are derived from different individuals. In addition. according to the authors the technique used identified at most 73% of the microbial population.

The second molecular study (from our group) by Johnson and colleagues investigated the mucosal adherent microbiota in 32 RPC patients (7 UC pouchitis, 15 UC non-pouchitis, 9 FAP nonpouchitis, 1 FAP pouchitis) [Johnson et al. 2009]. Mucosal biopsies were first cultured on agar, the bacterial DNA was then extracted and amplified using PCR and profiles were generated using TRFLP [Johnson et al. 2009]. No differences between pouchitis and nonpouchitis groups or between FAP and UC groups were found but this study also had significant limitations. The use of an enrichment culture technique potentially favoured identification of bacteria supported by the culture conditions and TRFLP can only identify dominant species groups and is not able to identify individual bacterial species.

A further study by Lim and colleagues investigated the luminal microbiota in 20 RPC patients (5 UC pouchitis and 15 UC non-pouchitis) using TRFLP. They reported no differences in diversity or TRFLP profile between pouchitis and nonpouchitis samples. Again this study was limited by the use of TRFLP [Lim et al. 2009].

We recently performed a further study of the mucosal adherent microbiota in 24 RPC patients (8 UC pouchitis, 8 nonpouchitis, 5 FAP nonpouchitis and 3 FAP pouchitis). PCR amplification of bacterial 16S rRNA genes was performed and samples were individually cloned and sequenced to the species/phylotype level [McLaughlin et al. 2010]. There was a significant increase in Proteobacteria and a significant reduction in Bacteroidetes and Faecalibacterium prausnitzii in the total UC compared with the total FAP cohort with only small differences between the UC nonpouchitis and UC pouchitis groups and the FAP pouchitis and FAP nonpouchitis groups. Bacterial diversity was significantly greater in FAP nonpouchitis compared with UC nonpouchitis samples and significantly greater in UC nonpouchitis samples compared with UC pouchitis samples. No individual species or phylotype was specifically associated with either UC or FAP pouchitis.

Summary

The results from culture-based studies of pouch microbiota using culture methods are varied and inconclusive. Advances in our understanding of gut microbiota following the introduction of molecular techniques have led to the realization that culture-based techniques are inadequate for the study of gut microbiota. The differences in findings between earlier and the most recent molecular studies are likely to be explained by the different techniques employed and the limitations of the earlier studies. The findings of the most recent study [McLaughlin et al. 2010] suggest that a reduction in bacterial diversity but not dysbiosis occurs in pouchitis and that UC RPC patients have a different, less-diverse microbiota with increased Proteobacteria and reduced Bacteroidetes and F. prausnitzii.

 

[David in Seattle]

Treatment of Pouchitis

Before drug treatment is initiated a clinical diagnosis of pouchitis should be confirmed by flexible pouchoscopy and histological biopsy demonstrating acute inflammation since other causes of pouch dysfunction may present with similar symptoms [McLaughlin et al. 2008b]. In addition other precipitants should be considered; NSAIDs are associated with pouchitis and withdrawal may induce remission [Shen et al. 2007b]. Infectious agents such as Clostridium difficile and CMV should be excluded in those with pouchitis that fails to respond to antibiotics [Pfau and Lichtenstein, 2000].
Antibiotics

Ciprofloxacin or metronidazole for 14 days has been effective in several studies and should be considered as first-line treatment [Shen et al. 2001; Madden et al. 1994]. Topical metronidazole, given per anum, has also been shown to be effective and should be considered in patients intolerant to oral metronidazole who fail treatment with ciprofloxacin [Johnson et al. 2001]. Rifaxamin when used as a single agent for the treatment of pouchitis was found to be no more effective than placebo in a randomized placebo-controlled study of 18 patients [Isaacs et al. 2007].

Treatment options for patients who fail to respond to combination antibiotics or who relapse on maintenance treatment are very limited and some patients will have chosen indefinite diversion with an end ileostomy (with or without pouch excision). Using faecal coliform sensitivity testing our group recently demonstrated that ineffective combination antibiotic treatment may be due to the development of bacterial resistance. In a study of 15 patients who had failed to respond to empirical antibiotic treatment, ciprofloxacin resistance was identified in all stool samples and selection of another antibiotic based on bacterial sensitivity analysis resulted in remission in 80% of patients [McLaughlin et al. 2009a].

Other Agents

Budesonide has been shown to be effective in those with refractory pouchitis who do not respond to a single antibiotic in an open-label study [Gionchetti et al. 2007b] but a randomized double-blind study found it to be no more effective than metronidazole [Sambuelli et al. 2002]. Its efficacy in those who fail to respond to ciprofloxacin and metronidazole or other combination regimes has not been demonstrated.

Bismuth-citrate carbomer enemas were shown to be effective in an open-label study using with 83% of patients entering remission [Gionchetti et al. 1997], however a subsequent double-blind randomised trial found no difference when compared with placebo [Tremaine et al. 1997].

There are no controlled trials of oral or topical mesalamine for pouchitis. A study which compared a combination of ciprofloxacin and tinidazole in pouchitis with a historical cohort treated with mesalamine found that 50% achieved clinical remission and 50% had a clinical response. Overall there was a significant reduction in the PDAI but no improvement in the Cleveland global quality of life (CGQoL) score, whereas of the patients treated with ciprofloxacin and tinidazole, 87.5% achieved a clinical remission and 87.5% achieved a clinical response with a significant reduction in PDAI and improvement in CGQoL score [Shen et al. 2007a]. Sulphasalazine was recently found to be effective for the treatment of pouchitis. In an open-label study of 11 patients 63% of patients were in remission after 8 weeks treatment [Belluzzi et al. 2010].

Allopurinol was found to be ineffective in preventing pouchitis in a randomised placebo controlled study [Joelsson et al. 2001]. Treatment with short chain fatty acids (SCFAs) was also ineffective in uncontrolled studies [de Silva et al. 1989].

Infliximab was beneficial in one study of patients with pouchitis and extensive PPI; however, they were found to have almost total small bowel inflammation (demonstrated by video-capsule endoscopy). It is possible therefore that this patient group had CD rather than UC [Calabrese et al. 2008]. In a recent retrospective uncontrolled study of 10 patients, seven maintained a clinical response at a median follow up of 8.5 months and endoscopy demonstrated four to have continuing mucosal inflammation [Ferrante et al. 2010].

Other therapies that have been tried include oral prednisolone and azathioprine. There is, however, no good evidence that these are effective in pouchitis [Pardi and Sandborn, 2006]. There are two reports of the development of pouchitis in patients taking azathioprine for primary sclerosing cholangitis [Rowley et al. 1995; Zins et al. 1995] suggesting that immunomodulators may not be effective in pouchitis.

 

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Figure 1.

An algorithm for the treatment of pouchitis. Reproduced with permission from Blackwell Publishing Ltd (McLaughlin et al. [2008b]).



Figure 2.

Potential mechanism of dysbiosis in pouchitis.

 

[David in Seattle]

Treatment of Prepouch Ileitis

Two studies have reported the results of treatment for PPI. In the first, seven patients with chronic relapsing pouchitis and total small bowel inflammation identified at video-capsule endoscopy were treated with a standard infliximab induction regime of three infusions. Symptomatic and endoscopic resolution was reported in six [Calabrese et al. 2008]. Although CD had been excluded on histological grounds the presence of extensive small bowel inflammation raises the possibility that these patients were suffering from CD and not UC.

In the second study 14 patients with symptomatic PPI were treated with ciprofloxacin and metronidazole for 28 days. Twelve (86%) patients experienced symptomatic remission with a reduction in stool frequency from a median of 12 to 6 [McLaughlin et al. 2008a]. Given the cost and potentially significant complications associated with infliximab it is generally recommended that combination antibiotic therapy should be first-line treatment in patients with symptomatic PPI.

Maintenance Therapy

It has been recommended that patients with chronic pouchitis who achieve remission following antibiotic therapy but relapse more than three times per year should be treated with maintenance therapy [Pardi and Sandborn, 2006]. Treatment with ciprofloxacin or the probiotic VSL#3 are recommended in the British Society of Gastroenterology IBD guidelines [Carter et al. 2004].

Studies Using VSL#3. The probiotic VSL#3 was shown to maintain remission in 85% of patients with refractory pouchitis who had entered clinical and endoscopic remission following 4 weeks treatment with ciprofloxacin and rifaxamin in a randomized placebo-controlled study of 40 patients [Gionchetti et al. 2000], whilst a later two-centre randomised placebo-controlled study of 36 patients found that 85% of patients could maintain remission following 4 weeks treatment with ciprofloxacin and metronidazole [Mimura et al. 2004]. In contrast, however, a more recent 8-month open-label clinical study reported that less than 20% of patients were able to maintain remission [Shen et al. 2005].

The reason for the difference in these results is not clear but differences in the design and protocol of the two studies may have contributed. The most important and modifiable factors were as follows.

Studies by Gionchetti and colleagues [Gionchetti et al. 2000] and Mimura and colleagues [Mimura et al. 2004] excluded patients who did not achieve complete or near-complete endoscopic remission with a score of ≤3 in the clinical component of the PDAI, whereas Shen et al. [2005] did not repeat the pouchoscopy after clinical remission. It is known that some patients do not achieve endoscopic remission despite clinical remission following antibiotic treatment [Madden et al. 1994] and it is possible that this subset of patients have a more difficult to treat disease which may not respond to probiotics.

Gionchetti's and Mimura's groups used a combination of ciprofloxacin and rifaxamin or metronidazole for 4 weeks whereas Shen and colleagues used a 2-week course of ciprofloxacin only to induce remission. It is possible that probiotic therapy is more effective following a combination of two different antibiotic agents for a prolonged period. Gionchetti and colleagues' and Mimura and colleagues' studies recruited patients with refractory pouchitis, defined as three or more episodes of pouchitis per year, whereas Shen and colleagues only recruited patients with chronic antibiotic-dependent pouchitis, defined as four or more episodes of pouchitis per year. Therefore, many of the patients included in the studies of Gionchetti's and Mimura's groups had less-aggressive disease in which maintenance of remission may have been easier to achieve.

Studies of Antibiotic Maintenance Therapy. Two studies have reported the outcome of maintenance antibiotic treatment. In the first, 51 patients were treated with rifaxamin maintenance therapy after induction of remission with single or combination antibiotic therapy [Shen et al. 2008]. At 3, 12 and 24 months 65%, 58% and 3% of patients were in remission. Importantly those who failed to achieve endoscopic as well as clinical remission were excluded from the study. In the second study (from our group) [McLaughlin et al. 2009b] which included both patients who had and who had not achieved endoscopic as well as clinical remission, retrospective data on 25 patients were reported. Several antibiotics had been used including ciprofloxacin, trimethoprim, coamoxiclav, colistin, nitrofurantoin, cefixime and trimethoprim. During a median follow up of 15.8 months no patient developed C. difficile colonization but 24% relapsed. In these, faecal coliform sensitivity testing [McLaughlin et al. 2009a] demonstrated bacterial resistance in all cases and identified an appropriate change of antibiotic which resulted in the induction and maintenance of remission in all of these patients. Those who developed antibiotic resistance were successfully treated with two-weekly alternating antibiotics. In this study the presence of PPI but not failure of mucosal healing was associated with an increased risk of relapse.

The recent comprehensive molecular study comparing the microbiota in UC and FAP RPC patients [McLaughlin et al. 2010] identified similar differences to those reported previously in the colonic mucosa of UC and CD patients compared with patients without IBD. Frank and colleagues reported a reduction in Bacteroidetes and Lachnospiraceae and a reciprocal increase in Proteobacteria in a subset of IBD patients [Frank et al. 2007]. Other studies too have reported increases in Proteobacteria in IBD patients [Gophna et al. 2006; Seksik et al. 2003]. F. prausnitzii which was reduced in the UC RPC group has previously been postulated to have anti-inflammatory properties and found to be reduced in IBD patients [Sokol et al. 2009, 2008].

Conclusion

Bacterial diversity has been demonstrated in UC and CD and appears to be important in maintaining normal gut homeostasis [Andoh et al. 2007; Sokol et al. 2006; Ott et al. 2004]. In RPC there is a reduction in diversity in UC patients compared with FAP patients and a further reduction in diversity in patients with pouchitis [McLaughlin et al. 2010]. Overall these findings suggest that the pathogenesis of pouchitis is similar to that of UC and CD and that either a reduction in bacterial diversity leads to stimulation of the immune system resulting in mucosal inflammation or that dysbiosis predisposes UC patients to pouchitis by increasing the likelihood of immune system stimulation.

Antibiotics remain the mainstay of treatment for pouchitis and PPI. The majority of patients will enter clinical remission following single-agent or combination antibiotic therapy. Failure to respond to this treatment is likely to be due to the presence of resistant organisms. Faecal coliform sensitivity testing to identify an appropriate alternative antibiotic should be performed. About 5–19% of patients will develop chronic relapsing pouchitis [Madiba and Bartolo, 2001; Mowschenson et al. 2000; Hurst et al. 1998]. These should be treated with maintenance therapy to maintain symptomatic remission. In those patients where maintenance therapy fails to control symptoms indefinite diversion with an ileostomy with or without pouch excision should be considered. Conflict of interest statement The Authors declare that there are no conflicts of interest. Financial support S.D. McLaughlin is supported by the Broad medical research programme and the St Mark's Hospital foundation.

 

[David in Seattle]

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[David in Seattle]

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[David in Seattle]

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[gottswood]

Any information on fecal transplantation for pouchitis?