Pseudomembranous colitis

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What is pseudomembranous colitis

What is pseudomembranous colitis

Pseudomembranous colitis, also known as antibiotic-associated diarrhea, is an inflammatory condition of the colon characterized by elevated yellow-white plaques that coalesce to form pseudomembranes on the mucosa ¹⁾. Pseudomembranous colitis is commonly a manifestation of severe colonic disease that is usually associated with Clostridium difficile infection as a result of the use of broad-spectrum antibiotics, but can be caused by a number of different etiologies. The use of broad spectrum antibiotics – especially ampiciliin and clindamycin, although any broad-specturm antibiotic has the potential to cause it. These broad-spectrum antibiotics affect the normal bowel flora of the bowel, leading to overgrowth of the bacterium Clostridium difficile, which causes the colitis. Around 3-10% of adults receiving antibiotics will get diarrhoea as a result of pseudomembranous colitis. Prior to the use of broad-spectrum antibiotics, pseudomembranous colitis was more frequently related with ischemic disease, obstruction, sepsis, uremia, and heavy metal poisoning ²⁾. Clostridium difficile is more common in people who need to take antibiotics for a long period of time.The elderly also have a higher risk of getting it. The infection can spread in hospitals and nursing homes.

The list of associated causes is vast, although Clostridium difficile infection is still the most common cause. Symptoms usually occur 5-10 days after ingesting antibiotics.

Symptoms of pseudomembranous colitis include:

Watery or bloody diarrhea;
Pus or mucus in your stool;
Abdominal cramps;
Loss of appetite;
Abdominal pain or tenderness;
Nausea;
Fever;
Dehydration.

Most pseudomembranous colitis cases are mild complaints and resolve on stopping the antibiotics. More severe cases result in protracted diarrhoea, and if untreated, can be severe.

On endoscopic examination, pseudomembranous colitis is characterized by elevated yellow-white nodules or plaques that form pseudomembranes on the mucosal surfaces of the colon (see Figure 1) ³⁾. Endothelial damage from the initial event or disease process causes small areas of necrosis in the surface epithelium. The eruption of neutrophils, nuclear debris, and other inflammatory elements from the lamina propria onto the epithelium then leads to pseudomembrane formation ⁴⁾. Pseudomembranes can be up to two centimeters in diameter, scattered among areas of normal or erythematous mucosa; however, confluent pseudomembranes that cover the entirety of the mucosa can be seen in severe disease ⁵⁾.

Pseudomembranous colitis is easily treated with the discontinuation of the offending antibiotic and use of a specific antibiotic against Clostridium difficile. The disease can be severe if untreated, however, and in some it can relapse after treatment. Rarely, they are severe enough to need surgery.

Figure 1. Pseudomembranous colitis – flexible sigmoidoscopy showing diffuse pseudomembranes covering severely edematous and friable mucosa in the rectosigmoid colon in a patient with Clostridium difficile infection.

Figure 2. Large intestine (colon)

Classification of pseudomembranous lesions can be made based on the degree and depth of inflammatory changes, with grading of lesions from type 1 (“summit lesions”, focal surface epithelial inflammation or necrosis) to type 3 (complete mucosal necrosis and significant inflammatory debris). Histologic examination of biopsy samples vary based on the underlying cause, disease severity, and time course of the disease, which can make identification of the inciting trigger challenging.

What is Clostridium difficile?

Clostridium difficile is a Gram-positive, spore-forming bacterium usually spread by the fecal-oral route. Clostridium difficile is non-invasive and produces toxins A and B that cause disease, ranging from asymptomatic carriage, to mild diarrhea, to colitis, or pseudomembranous colitis. Clostridium difficile infection is defined as the acute onset of diarrhea with documented toxigenic Clostridium difficile or its toxin and no other documented cause for diarrhea ⁶⁾. Patients with Clostridium difficile infection typically have extended lengths-of-stay in hospitals, and Clostridium difficile infection is a frequent cause of large hospital outbreaks of disease with costs of $3.2 billion dollars annually. This guideline provides recommendations for the diagnosis and management of patients with Clostridium difficile infection as well as for the prevention and control of outbreaks while supplementing previously published guidelines. New molecular diagnostic stool tests will likely replace current enzyme immunoassay tests.

Rates of Clostridium difficile infection have been increasing since 2000, especially in the elderly with a recent hospitalization or residing in long-term care facility ⁷⁾. Carriage of Clostridium difficile occurs in 5–15% of healthy adults, but may be as high as 84.4% in newborns and healthy infants, and up to 57% in residents in long-term care facility. Transmission in health-care facilities results mostly from environmental surface contamination and hand carriage by staff members and infected patients.

The two biggest risk factors are exposure to antibiotics and exposure to the organism; others are comorbid conditions, gastrointestinal tract surgery, and medications that reduce gastric acid, including proton-pump inhibitors ⁸⁾.

Pseudomembranous colitis complications

Treatment of pseudomembranous colitis is usually successful. However, even with prompt diagnosis and treatment, pseudomembranous colitis can be life-threatening. Possible complications include:

Abnormally low levels of potassium in your blood (hypokalemia), due to the loss of potassium during excessive diarrhea
Dehydration leading to abnormally low blood pressure (hypotension), related to significant loss of fluids and electrolytes due to diarrhea
Kidney failure, due to severe dehydration resulting from diarrhea
A hole in your bowel (perforated colon), which can lead to an infection of your abdominal cavity
Toxic megacolon, a rare but serious swelling of the colon, leaving it incapable of expelling gas and stool, which could cause your colon to rupture

In addition, pseudomembranous colitis may sometimes return, days or even weeks after apparently successful treatment.

Pseudomembranous colitis causes

Usually, your body keeps the many bacteria in your colon in a naturally healthy balance. However, antibiotics and other medications can upset this balance. Pseudomembranous colitis occurs when certain bacteria — usually Clostridium difficile — rapidly outgrow other bacteria that normally keep them in check. Certain toxins produced by Clostridium difficile, which are usually present in only tiny amounts, rise to levels high enough to damage the colon.

While almost any antibiotic can cause pseudomembranous colitis, some antibiotics are more likely to cause pseudomembranous colitis than others:

Fluoroquinolones, such as ciprofloxacin (Cipro) and levofloxacin (Levaquin)
Penicillins, such as amoxicillin and ampicillin
Clindamycin (Cleocin)
Cephalosporins, such as cefixime (Suprax)

Other medications

Other medications besides antibiotics can sometimes cause pseudomembranous colitis. Chemotherapy drugs that are used to treat cancer may disrupt the normal balance of bacteria in the colon.

Medications/chemicals

Alosetron
Cisplatin
Cocaine
Cyclosporine A
Dextroamphetamine
Docetaxel
5-Fluorouracil
Gold
Glutaraldehyde
NSAIDs
Paraquat

Certain diseases that affect the colon, such as ulcerative colitis or Crohn’s disease, may also predispose people to pseudomembranous colitis.

Clostridium difficile spores are resistant to many common disinfectants and can be transmitted from the hands of health care professionals to patients. Increasingly, Clostridium difficile has been reported in people with no known risk factors, including people with no recent health care contact or use of antibiotics. This is called community-acquired Clostridium difficile.

Infectious causes

Bacterial

Clostridium difficile
Clostridium ramosum
Escherichia coli O157:H7
Klebsiella oxytoca
Plesiomonas shigelloides
Salmonella enterica
Shigella species
Staphylococcus aureus
Yersinia enterocolitica

Parasites

Entamoeba histolytica
Schistosoma mansoni
Strongyloides stercoralis

Virus

Cytomegalovirus

Other colitis

Behcet’s disease
Collagenous colitis
Inflammatory bowel disease
Ischemic colitis

Risk factors for pseudomembranous colitis

Factors that may increase your risk of pseudomembranous colitis include:

Taking antibiotics
Staying in the hospital or a nursing home
Increasing age, especially over 65 years
Having a weakened immune system
Having a colon disease, such as inflammatory bowel disease or colorectal cancer
Undergoing intestinal surgery
Receiving chemotherapy treatment for cancer

Pseudomembranous colitis symptoms

Signs and symptoms of pseudomembranous colitis may include:

Watery or bloody diarrhea;
Pus or mucus in your stool;
Abdominal cramps;
Loss of appetite;
Abdominal pain or tenderness;
Nausea;
Fever;
Dehydration

Symptoms of pseudomembranous colitis can begin as soon as one to two days after you start taking an antibiotic, or as long as several weeks after you finish taking the antibiotic.

Pseudomembranous colitis diagnosis

The best standard laboratory test for Clostridium difficile infection diagnosis has not been clearly established. For the past 30 years, the two primary reference tests are the Clostridium difficile cytotoxin neutralization assay and toxigenic culture ⁹⁾. Clostridium difficile culture alone is not sufficient because not all Clostridium difficile strains produce toxin ¹⁰⁾.

Tests and procedures used to diagnose pseudomembranous colitis and to search for complications include:

Stool sample. Only stools from patients with diarrhea should be tested for Clostridium difficile. There are a number of different stool sample tests used to detect Clostridium difficile infection of the colon.
- Nucleic acid amplification tests for Clostridium difficile toxin genes such as PCR (polymerase chain reaction) are superior to toxins A+B enzyme immunoassay testing as a standard diagnostic test for Clostridium difficile infection.
- Glutamate dehydrogenase screening tests for C difficile can be used in two- or three-step screening algorithms with subsequent toxin A and B enzyme immunoassay testing, but the sensitivity of such strategies is lower than nucleic acid amplification tests.
Because Clostridium difficile carriage is increased in patients on antimicrobial therapy, only diarrheal stools warrant testing ¹¹⁾. Very occasionally, a patient with ileus and complicated disease will have a formed stool ¹²⁾, in which case the laboratory should be made aware of this special clinical situation. Rectal swabs can be used for PCR and thus may be useful in timely diagnosis of patients with ileus ¹³⁾.
Routine stool cultures.
Full blood count. These may reveal an abnormally high white blood cell count (leukocytosis), which may indicate pseudomembranous colitis.
Urea and electrolytes – dehydration. Low potassium and acidosis may develop.
Albumin – low blood albumin levels due to stool protein losses.
Colonoscopy or sigmoidoscopy. In both of these tests, your doctor uses a tube with a miniature camera at its tip to examine the inside of your colon for signs of pseudomembranous colitis — raised, yellow plaques (lesions), as well as swelling.
Imaging tests. If you have severe symptoms, your doctor may obtain an abdominal X-ray or an abdominal CT scan to look for complications such as toxic megacolon or colon rupture.

Table 1. Diagnostic testing for Clostridium difficile

Test	Sensitivity	Specificity	Availability	Expense^a	Utilization
C. difficile culture	Low	Moderate	Limited	$5–10	No diagnostic use; only toxigenic organisms cause disease
Toxigenic culture	High	High	Limited	$10–30	Reference method Epidemiologic tool Limited diagnostic use
CCNA	High	High	Limited	$15–25	Reference method Limited diagnostic use
GDH	High	Low	Widely	$5–15	Diagnostically as a screening test; must be confirmed
Toxin EIA tests	Low	High	Widely	$5–15	Must detect toxins A+B; inferior sensitivity
NAATs	High	High	Widely	$20–50	Use only in acute disease; false positives of concern
CCNA, Clostridium difficile cytotoxin neutralization assay; GDH, glutamate dehydrogenase; EIA, enzyme immunoassay; NAAT, nucleic acid amplification tests. ^a Cost of goods; does not reflect laboratory changes.

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Glutamate dehydrogenase (GDH) is an enzyme produced by Clostridium difficile in relatively large amounts compared with toxins A and B ¹⁵⁾. Although glutamate dehydrogenase (GDH) is sensitive, it is not as specific for Clostridium difficile infection, because this enzyme is produced by both toxigenic and non-toxigenic organisms. Additionally, antibodies against Clostridium difficile glutamate dehydrogenase (GDH) may cross react with the same enzyme in other clostridial species ¹⁶⁾. Reports and meta-analyses detail sensitivity ranging from 75% to >90% with a negative predictive value of between 95% and 100%, although its positive predictive values have been found to be as low as 50% ¹⁷⁾. The sensitivity of glutamate dehydrogenase antigen detection has led to its use as a screening test as part of Clostridium difficile infection testing algorithms, although it should be noted that as many as 10% of patients with toxigenic organisms can be missed by this method. In this approach, glutamate dehydrogenase (GDH) is the initial test, and glutamate dehydrogenase (GDH)-negative specimens are reported as negative with no further testing done. Glutamate dehydrogenase (GDH)-positive specimens must undergo additional testing for C. difficile either by nucleic acid amplification test or by enzyme immunoassay testing followed by nucleic acid amplification test if the enzyme immunoassay results are discordant ¹⁸⁾.

Evidence suggests that nucleic acid amplification tests for toxigenic Clostridium difficile are good stand-alone tests for toxigenic Clostridium difficile. There are several Food and Drug Administration (FDA)-approved nucleic acid amplification test’s, including PCR assays and isothermal amplification tests. PCR is an excellent confirmatory test, but data for isothermal amplification testing are not yet sufficient to recommend it.

Clinical practice guidelines have evolved over the past 3 years to suggest the following diagnostic approaches ¹⁹⁾.

(1) Glutamate dehydrogenase (GDH) screen followed by a confirmatory test in two- or three-step algorithms.
(2) Nucleic acid amplification test for toxigenic Clostridium difficile, but only in patients with documented diarrhea. Their use in any other clinical setting may yield false positive test results.
(3) Enzyme immunoassay for toxin A+B lacks sensitivity compared with Clostridium difficile cytotoxin neutralization assay and toxigenic culture and should not be used as a stand-alone test. More information on microbiological testing is in the appendix.

Several studies have shown that repeat testing after a negative test is positive in <5% of specimens and repeat testing increases the likelihood of false positives ²⁰⁾. If repeat testing is requested, the physician should confer with the laboratory to explain the clinical rationale. There is no evidence that repeated testing can enhance the sensitivity or negative predictive values of nucleic acid amplification tests for Clostridium difficile diagnosis compared with toxigenic cultures. Empiric therapy for Clostridium difficile infection should not be discontinued or withheld in patients with a high pre-test suspicion for Clostridium difficile infection. Studies have shown that both toxin A+B enzyme immunoassay and toxigenic culture may remain positive for a long as 30 days in patients who have resolution of symptoms ²¹⁾. False positive “test of cure” specimens may complicate clinical care and result in additional courses of inappropriate anti-Clostridium difficile therapy.

Pseudomembranous colitis treatment

Treatment strategies include:

Stopping the antibiotic or other medication that’s thought to be causing your signs and symptoms, if possible. Sometimes, this may be enough to resolve your condition or at least ease signs, such as diarrhea.
If a patient has a strong pre-test suspicion for Clostridium difficile infection, empiric therapy for Clostridium difficile infection should be considered regardless of the laboratory testing result, as the negative predictive values for Clostridium difficile infection are insufficiently high to exclude disease in these patients.
Starting an antibiotic likely to be effective against Clostridium difficile. If you still experience signs and symptoms, your doctor may use a different antibiotic to treat Clostridium difficile. This allows the normal bacteria to grow back, restoring the healthy balance of bacteria in your colon. You may be given antibiotics by mouth, through a vein or through a tube inserted through the nose into the stomach (nasogastric tube). Depending on your condition, doctors will use most often use metronidazole (Flagyl), vancomycin, fidaxomicin (Dificid) or a combination to eradicate the organisms.
- Patients with mild-to-moderate Clostridium difficile infection should be treated with metronidazole 500 mg orally three times per day for 10 days ²²⁾. Failure to respond to metronidazole therapy within 5–7 days should prompt consideration of a change in therapy to vancomycin at standard dosing.
- Metronidazole treatment should be avoided in pregnancy and breast feeding. First trimester exposure to metronidazole is not recommended in FDA guidelines because of concern regarding ready placental transmission and case reports describing facial anomalies following exposure. Metronidazole and its active metabolites are readily detected in breast milk and in the plasma of infants.
- Patients with severe Clostridium difficile infection should be treated with vancomycin 125 mg orally four times per day for 10 days ²³⁾.
- Oral vancomycin cannot reach segments of colon that are not in continuity with the gastrointestinal tract, such as the patient with an upstream ileostomy, Hartman’s pouch, or colostomy. In patients in whom oral antibiotics cannot reach a segment of the colon, such as with Hartman’s pouch, ileostomy, or colon diversion, vancomycin therapy delivered via enema should be added to treatments above until the patient improves. When Clostridium difficile infection is documented in an excluded segment of diverted colon, administration of vancomycin by enema is recommended to guarantee that treatment will reach the affected area, using vancomycin enemas of 500 mg in 100–500 ml of normal saline every 6 hour for Clostridium difficile infection ²⁴⁾, volume depending on length of segment to be treated. The duration of enema therapy should continue until the patient has significant improvement.
Oral cholestyramine to help bind the toxin of Clostridium difficile.
The use of anti-peristaltic agents to control diarrhea from confirmed or suspected Clostridium difficile infection should be limited or avoided, as they may obscure symptoms and precipitate complicated disease. Use of anti-peristaltic agents in the setting of Clostridium difficile infection must always be accompanied by medical therapy for Clostridium difficile infection.
Having fecal microbial transplantation. If your condition is extremely severe, you may be given a transplant of stool (fecal transplant) from a healthy donor to restore the balance of bacteria in your colon. The donor stool may be delivered through a nasogastric tube, inserted into the colon or placed in a capsule you swallow. Often, doctors will use a combination of antibiotic treatment followed by fecal microbial transplantation.

Once you begin treatment for pseudomembranous colitis, signs and symptoms may begin to improve within a few days.

Researchers are exploring new treatments for pseudomembranous colitis, including alternative antibiotics and a vaccine.

Summary of the first-line antibiotics evidence

The two first-line antibiotics used most often to treat Clostridium difficile infection in North America are metronidazole and vancomycin; a third, fidaxomicin, was approved for treatment of Clostridium difficile infection in 2011. Treatment for Clostridium difficile infection can be initiated before laboratory confirmation for patients with a high pre-test suspicion of disease. Two older randomized control trials that compared vancomycin and metronidazole for treatment of Clostridium difficile infection did not demonstrate superiority of metronidazole compared with vancomycin ²⁵⁾. However, two more recent randomized control trials concluded vancomycin is superior to metronidazole for patient with severe Clostridium difficile infection ²⁶⁾. In one, 150 patients were stratified by an ad-hoc definition of Clostridium difficile infection severity and then randomized to oral metronidazole or vancomycin ²⁷⁾. Clinical cure was defined as a negative follow-up toxin assay and absence of diarrhea on day 6 of therapy. Using this definition, 90% of patients treated with metronidazole and 98% treated with vancomycin were cured of mild Clostridium difficile infection, but cure rates were lower in the severe disease group treated with metronidazole (76%) compared with vancomycin (97%). Although widely cited as evidence that vancomycin is superior to metronidazole for the treatment of severe Clostridium difficile infection, this study has potential limitations, including nonstandard dose of metronidazole and using an invalidated definition of cure (a negative follow-up toxin assay) when metronidazole is known to be inferior to vancomycin for microbiological end points during Clostridium difficile infection therapy ²⁸⁾. Most importantly, the definition of mild Clostridium difficile infection in the trial included many patients who would be considered as having severe Clostridium difficile infection by the proposed definition based on cohort studies in this treatment guideline.

Although the continued preference for metronidazole as the treatment of choice in mild-to-moderate Clostridium difficile infection is based on equal efficacy for most patients, an additional and important reason remains cost. Oral vancomycin costs $71 to 143 per day (depending on the dosing regimen chosen) compared with metronidazole, which costs $2 per day. Although the intravenous formulation of vancomycin can be compounded by inpatient hospital pharmacies and some outpatient pharmacies at approximately half this cost, the cost difference remains substantial and can impair compliance. Another reason that vancomycin is not used in the inpatient setting is the theoretical risk of promoting acquisition of vancomycin-resistant enterococcus. However, vancomycin-resistant enterococcus has not been shown to be a valid reason to avoid use of vancomycin for treatment of Clostridium difficile infection, as both vancomycin and metronidazole treatment for Clostridium difficile infection have been shown to promote vancomycin-resistant enterococcus acquisition in prospective observational studies ²⁹⁾.

Although it is common practice to prescribe 10–14 days of treatment for Clostridium difficile infection, treatment duration is 10 days in all the previous randomized control trials of both metronidazole and vancomycin. Because there is no evidence that supports longer treatment durations as more efficacious, the use of 14-day treatment courses is not recommended for the initial treatment of mild-to-moderate Clostridium difficile infection when a treatment response has been observed by day 10. There is also no evidence to support the practice of extending anti-Clostridium difficile infection therapy for the duration of therapy if the patient is also on a non-Clostridium difficile infection antibiotic.

An alternate antibiotic is fidaxomicin (200 mg orally 2 times per day for 10 days) for the treatment of mild-to-moderate Clostridium difficile infection. On the basis of two randomized control trials with oral vancomycin, the FDA granted approval for fidaxomicin in May 2011 ³⁰⁾. In both published phase III trials, fidaxomicin demonstrated non-inferiority to vancomycin in the modified intention-to-treat and the per-protocol analyses for clinical response at the end of therapy and at 25 days post therapy. Further post-hoc analyses suggested that fidaxomicin is superior to vancomycin as there were fewer recurrences at 25 days after therapy. However, this superiority was seen only with initial infections not caused by NAP1/BI/027 where fidaxomicin was associated with a 16.9 and 19.6% risk reduction for recurrence in the two trials, which translates to a number needed to treat of 5–6 patients with non-/NAP1/BI/027 Clostridium difficile infection treated with fidaxomicin to prevent one recurrence.

There are several important limitations to these findings. First, neither trial extended to 90 days, the full extent needed to document recurrences by identical strains. Second, there is no biological plausibility to explain a strain-specific superiority of fidaxomicin; there are no differences in minimal inhibitory concentrations between NAP1/BI/027 and non-NAP1/BI/027 strains, and both vancomycin and fidaxomicin have similar spectra of activity against Gram-positive stool bacteria. Third, surveillance testing in a patient on the fidaxomicin study arm has already revealed the evolution of a Clostridium difficile strain with an elevated minimal inhibitory concentration to fidaxomicin due to a mutation in RNA polymerase B. Resistance to vancomycin in vitro has not been observed in vancomycin trials to date. Finally, the cost of fidaxomicin is significantly higher than that of vancomycin. Given the limited data available, researchers urge caution in committing patients to a course of this drug before more definitive evidence of superiority in post-marketing clinical trials.

Table 2. Clostridium difficile infection severity scoring system and summary of recommended treatments

Severity	Criteria	Treatment	Comment
Mild-to-moderate disease	Diarrhea plus any additional signs or symptoms not meeting severe or complicated criteria	Metronidazole 500mg orally three times a day for 10 days. If unable to take metronidazole, vancomycin 125 mg orally four times a day for 10 days	If no improvement in 5–7 days, consider change to vancomycin at standard dose (vancomycin 125mg four times a day for 10 days)
Severe disease	Serum albumin <3g/dl plus ONE of the following: WBC ≥15,000 cells/mm³, Abdominal tenderness	Vancomycin 125 mg orally four times a day for 10 days
Severe and complicated disease	Any of the following attributable to CDI: Admission to intensive care unit for CDI Hypotension with or without required use of vasopressors Fever ≥38.5 °C Ileus or significant abdominal distention Mental status changes WBC ≥35,000 cells/mm³ or <2,000 cells/mm³ Serum lactate levels >2.2 mmol/l End organ failure (mechanical ventilation, renal failure, etc.)	Vancomycin 500 mg orally four times a day and metronidazole 500 mg IV every 8 h, and vancomycin per rectum (vancomycin 500 mg in 500 ml saline as enema) four times a day	Surgical consultation suggested
Recurrent CDI	Recurrent CDI within 8 weeks of completion of therapy	Repeat metronidazole or vancomycin pulse regimen	Consider FMT after 3 recurrences
CDI, Clostridium difficile infection; FMT, fecal microbiota transplant; IV, intravenous; WBC, white blood cell.

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Treating recurring pseudomembranous colitis

The natural occurrence of new, more-aggressive strains of Clostridium difficile, which are more resistant to antibiotics, has made treating pseudomembranous colitis increasingly difficult and recurrences more common. With each recurrence, your chance of having an additional recurrence increases. Treatment options may include:

Repeat antibiotics. You may need a second or third round of antibiotics to resolve your condition.
Surgery. Surgery may be an option in people who have progressive organ failure, rupture of the colon and inflammation of the lining of the abdominal wall (peritonitis). Surgery has typically involved removing all or part of the colon (total or subtotal colectomy). A newer surgery that involves laparoscopically creating a loop of colon and cleaning it (diverting loop ileostomy and colonic lavage) is less invasive and has had positive results.
Fecal microbial transplantation. Fecal microbial transplantation is used to treat recurrent pseudomembranous colitis. You’ll receive healthy, cleaned stool in a capsule, nasogastrically or inserted into your colon.

The first recurrence of Clostridium difficile infection can be treated with the same regimen that was used for the initial episode. If severe, however, vancomycin should be used. The second recurrence should be treated with a pulsed vancomycin regimen.

Repeat courses of antibiotics, usually metronidazole or vancomycin are necessary to treat recurring pseudomembranous colitis; both have similar recurrence rates. Re-treatment with a 10–14-day regimen is common. Use of vancomycin is recommended for repeated recurrences because of the risk of neuropathy with repeated administration of metronidazole ³²⁾. The use of vancomycin, 125 mg four times daily for 10 days, is preferred for any recurrence if it is severe, even if the initial episode had been treated with metronidazole. If the initial episode was treated with vancomycin, a tapered and pulsed regimen or just a pulsed regimen of vancomycin may be considered; none of these recommendations for extended vancomycin regimens have been studied in randomized control trials. Evidence that longer, tapered, pulsed-dosing is more effective than conventional regimens comes from evaluation of placebo-treated patients in a trial of a probiotic adjunct to antibiotic therapy in patients who already had one or more recurrences. Patients who had a standard 10–14-day course had recurrence rates of up to 54%, compared with 31% in those who had tapering regimens (gradually lowered doses) and 14% in those who had pulsed (every 2–3 day) regimens ³³⁾. There are no controlled data to support specific tapering or pulse regimens ³⁴⁾. We here propose a simple cost-effective regimen: a standard 10-day course of vancomycin at a dose of 125 mg given four times daily, followed by 125 mg daily pulsed every 3 days for ten doses. There is no convincing evidence of efficacy of other antibiotics, such as rifampin or rifaximin. In one study, six of seven patients responded to treatment with vancomycin and rifampin ³⁵⁾. In three small series, a total of 16 of 20 patients had no further recurrences when treated with 2 weeks of rifaximin after a 2-week course of vancomycin ³⁶⁾; a recently published randomized control trial of this regimen did not find a decrease in documented Clostridium difficile infection recurrences with rifaximin ³⁷⁾. Moreover, high-level resistance to rifampin is a concern and should limit its use ³⁸⁾.

If there is a third recurrence after a pulsed vancomycin regimen, fecal microbiota transplant (FMT) should be considered.

Fecal microbiota transplant is the term used when stool is taken from a healthy individual and instilled into a sick person to cure a certain disease ³⁹⁾. Studies show that patients with recurrent Clostridium difficile infection have abnormally proportioned colon microbiota, and that reintroduction of normal bacteria via donor feces corrects this imbalance, restoring phylogenetic richness and colonization resistance.

The first documented use of fecal microbiota transplant in the English language was a case series of four patients with pseudomembranous enterocolitis, three of whom were critically ill; fecal enemas (donated by the residents caring for the patients) were administered as an adjunct to antibiotic treatment; all four patients had resolution of symptoms within hours of fecal microbiota transplant ⁴⁰⁾. The first documented case of confirmed recurrent Clostridium difficile infection treated with fecal microbiota transplant was reported in 1983 in a 65-year-old woman who had “prompt and complete normalization of bowel function” ⁴¹⁾. Up until 1989, retention enemas had been the most common technique for fecal microbiota transplant; however, alternative methods subsequently were used, including fecal infusion via nasogastric duodenal tube in 1991 ⁴²⁾, colonoscopy in 2000 ⁴³⁾, and self-administered enemas in 2010 ⁴⁴⁾. By 2011, approximately 325 cases of fecal microbiota transplant had been reported worldwide, including approximately 75% by colonoscopy or retention enema, and 25% by nasogastric or nasoduodenal tube, or by esophagogastroduodenoscopy ⁴⁵⁾. Overall, mean cure rates to date are approximately 91% ⁴⁶⁾. In a recent series of 70 patients with recurrent Clostridium difficile infection, fecal microbiota transplant was effective even in patients with the C. difficile NAP1/BI/027 strain ⁴⁷⁾. A retrospective multicenter follow-up study of recurrent Clostridium difficile infection patients treated with fecal microbiota transplant demonstrated a 91% primary cure rate and a 98% secondary cure rate ⁴⁸⁾.

Fecal microbiota transplant appears to be safe, with no adverse effects or complications directly attributed to the procedure yet described in the existing literature ⁴⁹⁾, ⁵⁰⁾. The potential for transmission of infectious agents is a concern, however, and a recent publication outlines rigorous screening of stool donors’ blood and stool for common bacterial and viral enteropathogens ⁵¹⁾. In one series, a standardized filtered, frozen, and then thawed preparation of stool from pre-screened universal donors showed cure rates equal to or better than those from patient-identified donors ⁵²⁾.

Long-term follow-up of fecal microbiota transplant is limited. In the only such follow-up study to date, 77 patients had fecal microbiota transplant and were followed for >3 months (3 months to >10 years). Of these 77 subjects, four developed an autoimmune disease (rheumatoid arthritis, Sjögren’s syndrome, idiopathic thrombocytopenic purpura, and peripheral neuropathy) at some time after the fecal microbiota transplant, although a clear relationship between the new disease and the fecal microbiota transplant was not evident ⁵³⁾. Randomized control trials are necessary to prove the efficacy of fecal microbiota transplant and to determine the optimal route of administration among other variables and safety in immunosuppressed patients needs to be established. An randomized control trial of donor feces administered by duodenal infusion with gut lavage showed significant efficacy compared to vancomycin or vancomycin with gut lavage without donor feces ⁵⁴⁾. The study was terminated early because it was deemed unethical to continue as the cure rate was 81% compared to 23% with vancomycin alone and 31% with vancomycin and gut lavage. An National Institute of Health funded blinded randomized control trial is underway, using fecal microbiota transplant via colonoscopy with donor or recipient stool for transplant.

Home remedies

Some research suggests that concentrated supplements of good bacteria and yeasts (probiotics) can help prevent Clostridium difficile infection, but more studies are needed for their use in treating recurrences. They are safe to use and available in capsule or liquid form without a prescription.

To cope with the diarrhea and dehydration that can occur with pseudomembranous colitis, try to:

Drink plenty of fluids. Water is best, but fluids with added sodium and potassium (electrolytes) also may be beneficial. Avoid beverages that are high in sugar or contain alcohol or caffeine, such as coffee, tea and colas, which can aggravate your symptoms.
Choose soft, easy-to-digest foods. These include applesauce, bananas and rice. Avoid high-fiber foods, such as beans, nuts and vegetables. If you feel your symptoms are improving, slowly add high-fiber foods back to your diet.
Eat several small meals, rather than a few large meals. Space the smaller meals throughout the day.
Avoid irritating foods. Stay away from spicy, fatty or fried foods, and any other foods that make your symptoms worse.

There is limited evidence for the use of adjunct probiotics to decrease recurrences in patients with recurrent Clostridium difficile infection.

A probiotic is a living organism that, when ingested, is beneficial to the host. Several probiotics have been tested in patients with recurrent Clostridium difficile infection, always as an adjunct to antibiotics. In one study, the yeast Saccharomyces boulardii resulted in fewer recurrences in a group of patients with recurrent Clostridium difficile infection (35% vs. 65%) ⁵⁵⁾; however, the study had inadequate randomization by the type of adjunct Clostridium difficile infection antibiotic. In a later study, its efficacy was limited to the subgroup of patients treated with high doses (2 gm/day) of vancomycin (17% vs. 50%) but not in those given metronidazole or lower doses of vancomycin in whom recurrence rates were 56–60% ⁵⁶⁾. A small trial of Lactobacillus plantarum 299v combined with metronidazole had recurrence rates of 35% compared with 66% in the control groups, a difference that was not statistically significant ⁵⁷⁾. Two small randomized control trials of Lactobacillus rhamnosus GG failed to show efficacy in treating recurrent Clostridium difficile infection ⁵⁸⁾. One uncontrolled study using Kefir (an over-the-counter probiotic drink) as an adjunct to antibiotics did result in decreased recurrence of C. difficile ⁵⁹⁾.

A meta-analysis of probiotics for the prevention of antibiotic-associated diarrhea and for the treatment of Clostridium difficile infection concluded that S. boulardii was only effective for C. difficile disease ⁶⁰⁾; however, a Cochrane analysis concluded that there was insufficient evidence to recommend probiotics, in general, as an adjunct to antibiotics in the treatment of C. difficile diarrhea ⁶¹⁾. The most recent systematic review and meta-analysis of S. boulardii concluded that although there is strong evidence from numerous large randomized control trials for efficacy in prevention of antibiotic-associated diarrhea, the evidence for efficacy in the treatment of C. difficile as an adjunct to antibiotics is weak and more randomized control trials are needed ⁶²⁾.

Thus, there are no strong data to support the use of probiotics for recurrent Clostridium difficile infection treatment, and only weak evidence of therapeutic efficacy for S. boulardii. There is no evidence for the use of probiotics in the treatment of initial or severe disease. Moreover, these are live organisms and they should be used cautiously, if at all, in individuals with significant immune suppression because of the possible risk of bacteremia or fungemia. There are cases of S. boulardii fungemia reported in patients with central venous catheters, and thus its use in an ICU or in immunocompromised patients is not recommended ⁶³⁾. There are also numerous case reports of invasive lactobacillus infections in non-immunosuppressed (mostly elderly) patients ⁶⁴⁾. Finally, the use of probiotics is not regulated by the Food and Drug Administration, there is no good quality control for most probiotics, and studies have shown that some probiotics contain no live organisms, or alternatively, contain organisms not on the product label ⁶⁵⁾. In view of the lack of efficacy data, abundant data on potential harm, high costs, and lack of biological plausibility for these non-human micro-organisms to confer colonization resistance, their use cannot be recommended.

Non-toxigenic strains of C. difficile have been used to treat Clostridium difficile infection. Two patients with recurrent Clostridium difficile infection were given a non-toxigenic strain of C. difficile with resolution of symptom, but no randomized control trials have been done ⁶⁶⁾.

Surgery for complicated Clostridium difficile infection

Surgical consultation should be obtained on all patients with complicated Clostridium difficile infection. Surgical therapy should be considered in patients with any one of the following attributed to Clostridium difficile infection:

hypotension requiring vasopressor therapy;
clinical signs of sepsis and organ dysfunction;
mental status changes;
White Blood Cell count ≥ 50,000 cells/μl, lactate ≥ 5 mmol/l; or
complicated Clostridium difficile infection with failure to improve on medical therapy after 5 days.

A major challenge in the management of severe, complicated Clostridium difficile infection is the inability to predict in which patient medical therapy will fail, and lack of consensus on the indications or timing of surgery except the very rare complication of colonic perforation. The vague term “clinical deterioration” is frequently mentioned in already critically ill patients in whom medical therapy has failed. These strategies rely on surgery as a salvage therapy, which may account for the poor outcomes associated with subtotal colectomy in complicated Clostridium difficile infection, and mortality rates that range from 35% to 80% ⁶⁷⁾, ⁶⁸⁾.

It has become evident that surgery is of benefit to patients at the advanced extreme of Clostridium difficile infection, and early surgical consultation has been associated with improved survival. Data reviewed in several series suggest that earlier colectomy (time from presentation to surgery) was associated with a significantly decreased mortality ⁶⁹⁾. In an analysis of the literature from January 1989 to May 2009, earlier diagnosis and treatment with subtotal colectomy and end-ileostomy reduced mortality associated with fulminant Clostridium difficile infection ⁷⁰⁾. One study demonstrated a trend toward decreased mortality rates in patients with fulminant disease who underwent colectomy compared with those who did not ⁷¹⁾. These investigators further showed that admission of patients with complicated Clostridium difficile infection to a surgical service was associated with a decreased mortality and a shorter mean interval from admission to operation compared with admission to a non-surgical service.

Independent risk factors for mortality in patients who underwent colectomy that have been found consistently among multiple studies include the development of shock, as determined by the need for vasopressors, and increased lactate (≥5 mmol/l), mental status changes, end organ failure, renal failure, and the need for preoperative intubation and ventilation ⁷²⁾.

The above findings suggest that early operative management before the development of shock and organ failure leads to improved survival. Currently, there is no scoring system that creates a threshold for operative management. However, the more negative prognostic signs a patient has, the earlier surgical consultation and operative management should be considered.

The established operative management of severe, complicated Clostridium difficile infection has been subtotal colectomy with end-ileostomy. Survival of patients treated with segmental colectomy were worse than those treated with subtotal colectomy ⁷³⁾, likely because Clostridium difficile infection usually involves the entire colon. Intraoperative assessment of the extent of disease is difficult based upon the external appearance of the colon from the serosal surface. Although some series have reported perforation or infarction of the colon to be common findings at the time of surgery, colonic necrosis and perforation are not inherent to the disease process ⁷⁴⁾; they likely result from the development of shock with secondary non-occlusive ischemia and the use of vasopressors or when abdominal compartment syndrome develops and compromises colonic perfusion.

Interest has developed in early operative management other than colon resection given that the colon is most often viable at this stage without perforation ⁷⁵⁾. A recent case-controlled series demonstrated that loop ileostomy with intraoperative colon lavage with polyethylene glycol 3350/balanced electrolyte solution and post-operative antegrade colonic vancomycin flushes via the ileostomy led to colon preservation in over 90% of patients and had significantly improved survival compared with historical controls who had undergone colectomy (19% vs. 50% mortality) ⁷⁶⁾. Over 80% of cases were performed using a minimally invasive surgical approach, and a majority of patients who were followed long term had restoration of gastrointestinal continuity. Advantages of this approach are the potential willingness to utilize this treatment earlier in the course of disease based upon potential preservation of the colon and fewer long-term adverse consequences. Further validation of this approach is required.

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