Introduction

What is pouchitis? 

Pouchitis is a condition that affects individuals who have undergone ileal pouch surgery, usually following the surgical removal of the colon and rectum to treat diseases like ulcerative colitis. The pouch, created from the small intestine, functions as a new reservoir for stool. Pouchitis, or inflammation of this pouch, can result in symptoms such as urgent and frequent bowel movements, as well as stomach pain. The majority of patients have acute, transient episodes, but others could develop chronic pouchitis, necessitating continuous medical care to control symptoms and avoid relapses.¹

How is it treated?

Antibiotics are the initial line of treatment for pouchitis. For most people, acute pouchitis symptoms can be resolved using a two-week course of antibiotics. However, alternative or longer antibiotic courses may be recommended if symptoms do not resolve. Maintenance treatment could be required for individuals who are experiencing recurrence, which may mean that managing chronic pouchitis becomes dependent on antibiotics. In order to support the restoration of good gut flora and stop further flare-ups, taking probiotics and long-term, lower-dose antibiotics may be required.²

First-line treatments

Antibiotic-responsive pouchitis

The management and prognosis for pouchitis can differ significantly based on the type. A 14-day regimen of either metronidazole or ciprofloxacin is the recommended first-line therapy for antibiotic-responsive pouchitis. Comparative studies indicate that ciprofloxacin reduces disease activity index scores more effectively and has fewer adverse effects. Mesalamine enemas, clarithromycin, and tetracycline are some other therapies that have been studied.

Antibiotic-dependent pouchitis

Individuals suffering from antibiotic-dependent pouchitis may need continuous maintenance treatment, which involves taking probiotics or antibiotics to keep the illness in remission. 

Antibiotic-refractory pouchitis

One prevalent cause of pouch failure is antibiotic-refractory pouchitis, which presents considerable therapeutic challenges. It is crucial to look into its underlying causes, including infections, autoimmune disorders, or structural abnormalities in the pouch for individuals who do not respond to conventional antibiotic therapy. Biological therapies, corticosteroids, 5-aminosalicylates, and combined antibiotic regimens may be used to treat refractory patients.

Chronic antibiotic-resistant pouchitis

Chronic antibiotic-resistant pouchitis, or CARP for short, is a condition in which antibiotic therapy does not resolve the pouchitis, or causes it to improve but only for the condition to reappear later. In these situations, medical professionals would first investigate any possible unidentified reasons, such as autoimmune diseases, secondary infections, or structural anomalies inside the pouch.

Management of pouchitis is similar to those of inflammatory bowel disease if a definite cause cannot be identified. Bismuth enemas and mesalamine enemas, which help reduce symptoms and target pouch inflammation, respectively, may also be considered. Immunosuppressants reduce the excessive immune response, while corticosteroids can help manage persistent inflammation. Monoclonal antibodies strengthen the immune protection function, whereas synthetic small molecules provide an alternative. Lastly, even in the absence of a Clostridioides difficile infection, fecal microbiota transplants may help to reestablish a healthy gut microbiome.^2,3

Factors contributing to chronic antibiotic-resistant pouchitis (CARP)

The development of CARP might be attributed to several factors. Pouchitis is more common in patients with inflammatory bowel disease (IBD), such as ulcerative colitis, after proctocolectomy. Additionally, the presence of bacteria resistant to antibiotics, such as C. difficile, is a serious concern since chronic antibiotic treatment might cause non-pathogenic bacteria to become resistant, further disrupting the microbiome of the pouch.

Viral infections and fungal infections, which can cause inflammatory reactions in the pouch, are other possible causes. Immunosuppressive diseases and treatments can also reduce immunity, making a person more vulnerable to infections. Prolonged use of nonsteroidal anti-inflammatory drugs (NSAIDs) can also damage the lining of the pouch.¹

Symptoms of pouchitis 

Pouchitis causes a wide range of uncomfortable symptoms that greatly interfere with day-to-day functioning. Individuals frequently have cramping and lower abdominal discomfort, along with increased frequency and urgency of bowel movements. Nocturnal trips to the bathroom can disrupt sleep, while bowel incontinence and difficulty or straining during bowel movements are common. Along with the appearance of blood in stool, many often describe tenesmus, the unpleasant feeling of wanting to urinate or defaecate but being unable to do so. There might be further symptoms like chills or fever.¹

Causes of pouchitis 

Changes in the gut microbiota within the ileal pouch are thought to be associated with the development of pouchitis. The small intestine becomes a pouch when it comes into contact with fresh bacterial strains that compete with pre-existing ones, possibly inciting an inflammatory immune response. In some cases, this immune response can lead to an infection, as pathogenic bacteria may flourish when the normal balance of gut bacteria is disrupted.

After an ileal pouch surgery, early-onset pouchitis is frequently noticed, although it usually resolves with medication; it can happen again, resulting in recurring episodes. In more severe cases, this can progress to chronic antibiotic-dependent pouchitis (CADP) or, in certain people, chronic antibiotic-resistant pouchitis (CARP), in which the effectiveness of antibiotics gradually wears off.¹

Possible complications of pouchitis

While complications from acute pouchitis are not very common, prolonged or untreated cases may face problems. Patients may find it difficult to hold or release faeces as a result of altered bowel habits brought about by inflammation. These persistent issues can lower the overall quality of life by having negative impacts on physical and emotional health, as well as obstructing social activities. Prolonged inflammation can cause the pouch to constrict and scar (a condition known as pouch stricture), which can hinder healing and blood flow.

Extended inflammation can also cause the pouch lining to erode, leading to bleedable ulcers (sores). Malnutrition can also result from lining damage, which prevents the body from absorbing nutrients. Severe circumstances involving ongoing difficulties would call for surgery, which would involve ileostomy and pouch removal.¹

Diagnosing pouchitis

To diagnose pouchotis, apart from taking the history and performing a physical examination, the clinician may introduce a tiny camera into the pouch during an endoscopic examination. A biopsy may be performed as part of this treatment to detect possible underlying reasons and for further examination.

Apart from endoscopy, several imaging tests might be carried out to assess the situation. To thoroughly understand the state of the pouch, common diagnostic procedures may be employed, including CT scans and MRIs, as well as contrast pouchography (pouchogram), a specialized X-ray that employs contrast fluid for imaging.^2,3

Diet and pouchitis

The role of antioxidants

Studies suggest that a low level of antioxidants may increase the chance of pouchitis. Fruits and vegetables are rich in antioxidants, which are essential for scavenging free radicals, unstable chemicals that can harm cells and induce inflammation when they build up in the body. To maximize the benefits of these compounds, it is recommended to consume antioxidant-rich foods rather than relying solely on supplements. 

Cutting back on fiber consumption may help those who are suffering from the symptoms of pouchitis. A low-FODMAPS diet is usually recommended, which excludes items like certain forms of fiber and foods that cause gut flora to ferment. 

FODMAP stands for "Fermentable Oligosaccharides, Disaccharides, Monosaccharides, and Polyols." These are the kinds of carbohydrates that, in some individuals, can have poor absorption in the small intestine, resulting in gastrointestinal symptoms.¹

Summary 

Pouchitis is a condition that affects individuals who have undergone ileal pouch surgery, usually following the surgical removal of the colon and rectum because of diseases like ulcerative colitis. The pouch, created from the small intestine, functions as a new reservoir for stool. Pouchitis, or inflammation of this pouch, can result in symptoms of urgent and frequent bowel movements, as well as stomach pain. Changes in the gut microbiota within the ileal pouch are thought to be associated with the development of pouchitis. Antibiotics are the initial line of treatment for pouchitis. For most people, acute pouchitis symptoms can be resolved within a two-week course of antibiotics. However, an alternative or longer antibiotic course may be recommended if symptoms do not resolve. While acute pouchitis complications are not very common, prolonged or untreated cases may cause problems.