Fecal Transplant

A fecal transplant, also known as fecal microbiota transplantation (FMT), is a medical procedure that involves transferring stool from a healthy donor into the gut of a recipient. Its main purpose is to restore a healthy balance of gut bacteria. This treatment is primarily used for people with recurrent Clostridioides difficile (C. diff) infection that hasn't responded to other therapies.

What is Fecal Transplant?

A fecal transplant, or fecal microbiota transplantation (FMT), is a medical procedure where stool from a healthy donor is placed into a recipient's digestive tract. The goal is to introduce beneficial bacteria and restore a healthy balance of microorganisms in the gut. This treatment is mainly used for severe or recurring Clostridioides difficile (C. diff) infections.

The human gut contains trillions of bacteria, viruses, and fungi, collectively known as the gut microbiome. These microorganisms play a vital role in digestion, nutrient absorption, and immune system function. When the balance of these microbes is disrupted, it can lead to various health problems. A fecal transplant works by introducing a diverse community of healthy bacteria from a donor's stool into the recipient's gut. This helps to outcompete harmful bacteria, such as C. diff, and re-establish a healthy microbial environment. The donor stool is carefully screened for infectious diseases before use. The procedure is considered a biological therapy. It aims to treat the underlying imbalance in the gut microbiome rather than just the symptoms of an infection. This approach has shown significant success, particularly for specific types of severe gut infections.

Why it's done

Fecal transplant is primarily performed to treat recurrent Clostridioides difficile (C. diff) infection that has not improved with standard antibiotic treatments. C. diff is a harmful bacterium that can cause severe diarrhea, abdominal pain, and life-threatening colon inflammation. FMT helps restore healthy gut bacteria to fight off the C. diff overgrowth.

C. diff infection often occurs after taking antibiotics, which can kill off beneficial gut bacteria along with the harmful ones. This allows C. diff to multiply unchecked. Symptoms can range from mild diarrhea to severe colon inflammation (colitis), which can be life-threatening. For many people, C. diff infection can be treated with specific antibiotics. However, about 1 in 4 people (25%) who recover from C. diff will experience a recurrence. The risk of recurrence increases with each subsequent infection. After a second recurrence, the risk can be as high as 40% to 60%. When C. diff infection keeps coming back despite multiple rounds of antibiotics, a fecal transplant becomes a highly effective treatment option. It is not generally used for other conditions outside of clinical trials, as its effectiveness and safety for other diseases are still being studied.

How to prepare

Preparing for a fecal transplant involves several steps to ensure the procedure's safety and effectiveness. You will typically need to stop certain medications, follow a specific diet, and cleanse your bowel. Your doctor will provide detailed instructions, which may include taking antibiotics before the transplant and undergoing a bowel preparation similar to that for a colonoscopy.

Before the procedure, your doctor will review your medical history and current medications. You may need to stop taking certain antibiotics or other drugs for a period before the transplant. This helps create an optimal environment for the new bacteria to establish themselves. Always follow your doctor's specific instructions regarding medication changes. A crucial step is bowel preparation, which is similar to preparing for a colonoscopy. This usually involves following a clear liquid diet for a day or two and taking a laxative solution to completely empty your bowels. This cleansing helps ensure the donor stool can effectively reach and colonize the colon. Your doctor might also prescribe a short course of antibiotics immediately before the FMT. This aims to reduce the existing C. diff bacteria in your gut just before the healthy donor stool is introduced. This preparation helps maximize the chances of success for the transplant.

What happens during

During a fecal transplant, screened donor stool is introduced into your digestive tract using one of several methods. Common approaches include colonoscopy, endoscopy, enema, or oral capsules. The choice of method depends on your specific condition and your doctor's recommendation, with colonoscopy being a frequently used route to deliver the material directly into the colon.

The most common method for fecal transplant is through a colonoscopy. During this procedure, a thin, flexible tube with a camera is inserted into the rectum and guided through the colon. The prepared donor stool, mixed with a saline solution, is then delivered through the scope directly into the large intestine. You will typically receive sedation for comfort during a colonoscopy. Another method is through an enema, where the prepared stool mixture is inserted into the rectum. This is a simpler procedure but may not reach as far into the colon as a colonoscopy. For some patients, the stool may be delivered via an upper endoscopy, where it's placed into the small intestine, or through a nasogastric (NG) tube or nasoduodenal (ND) tube, which goes from the nose to the stomach or small intestine. Oral capsules containing freeze-dried donor stool are also an option. These capsules are swallowed and designed to release the healthy bacteria in the intestines. This method is less invasive and does not require sedation or bowel preparation in the same way as colonoscopy, but it may not be suitable for all patients. The entire procedure usually takes less than an hour, depending on the delivery method.

Recovery & timeline

Recovery from a fecal transplant is generally quick, with most people experiencing minimal discomfort and returning to normal activities within a day or two. You might have some mild bloating or gas immediately after the procedure, especially if it was done via colonoscopy. The goal is for the new bacteria to establish themselves, leading to symptom improvement within days to weeks.

Immediately after the procedure, you may feel some mild abdominal cramping, bloating, or gas. These symptoms are usually temporary and resolve within a few hours. If you received sedation for a colonoscopy, you would need someone to drive you home and should avoid strenuous activities or making important decisions for the rest of the day. Most people can resume their normal diet and activities the day after the transplant. Your doctor may advise you to avoid certain medications, such as antibiotics, for a period after the transplant, as these could disrupt the newly introduced healthy bacteria. It's important to follow all post-procedure instructions carefully. The timeline for symptom improvement varies. Some people report feeling better within a few days, while for others, it may take a week or two for the full benefits to become apparent. The goal is to stop the recurrent C. diff infections and restore normal bowel function. Your doctor will schedule follow-up appointments to monitor your progress.

Risks & side effects

Fecal transplant is generally considered safe, but like any medical procedure, it carries some risks and potential side effects. Common side effects are usually mild and temporary, such as gas, bloating, or abdominal discomfort. More serious, though rare, risks include infection from the donor stool, perforation of the bowel during colonoscopy, or allergic reactions.

Mild side effects are the most common and typically resolve quickly. These can include temporary abdominal cramping, gas, bloating, or diarrhea. These symptoms are often related to the procedure itself (like colonoscopy) or the initial adjustment of your gut to the new bacteria. More serious risks are rare but important to consider. There is a small risk of transmitting an infection from the donor stool, despite rigorous screening. Donors are tested for a wide range of bacteria, viruses, and parasites. However, not all potential pathogens can be screened for, and new ones may emerge. If the transplant is performed via colonoscopy, there's a very small risk of complications associated with that procedure, such as bleeding or a tear (perforation) in the bowel wall. Allergic reactions to components in the donor stool are also possible but uncommon. Your doctor will discuss these risks with you in detail before the procedure.

Success rate

Fecal transplant has a high success rate for treating recurrent Clostridioides difficile (C. diff) infection, with studies showing effectiveness rates often exceeding 80% to 90%. This means that a large majority of people experience a resolution of their C. diff symptoms and do not have further recurrences after the procedure.

For people with recurrent C. diff infection that has not responded to antibiotics, fecal transplant is significantly more effective than continued antibiotic treatment. Research, including systematic reviews, consistently shows high cure rates. For instance, one review found that FMT cured C. diff infection in about 85% to 90% of people who had not responded to standard treatments. The success rate can vary slightly depending on the delivery method, the number of previous C. diff recurrences, and the overall health of the individual. However, even with these variations, FMT remains one of the most effective treatments for this specific condition. Some people may require more than one transplant to achieve full resolution of symptoms, though this is less common. The long-term success of FMT is also promising, with many people remaining free of C. diff recurrence for extended periods after the procedure. This high success rate makes FMT a valuable option for those struggling with persistent C. diff infections, offering a chance to restore gut health and improve quality of life.

Frequently asked questions

Who can be a donor for a fecal transplant?

Donors are typically healthy individuals who undergo extensive screening, including blood and stool tests, to rule out infectious diseases and other health conditions. They are often close relatives or anonymous volunteers.

Is fecal transplant approved for conditions other than C. diff?

Currently, fecal transplant is only approved by the U.S. Food and Drug Administration (FDA) for recurrent Clostridioides difficile (C. diff) infection that has not responded to other treatments. Its use for other conditions is still experimental and primarily occurs within clinical trials.

How long does the effect of a fecal transplant last?

For most people, a successful fecal transplant provides a long-lasting resolution of recurrent C. diff infection. The healthy bacteria are intended to establish a stable presence in the gut, preventing future recurrences.

Does fecal transplant hurt?

The procedure itself is usually not painful. If performed via colonoscopy, you will receive sedation. Other methods like enemas or capsules are generally well-tolerated, though you might experience mild temporary discomfort like bloating or gas.

Can I get a fecal transplant if I'm pregnant?

The safety of fecal transplant during pregnancy has not been extensively studied. Your doctor will weigh the potential risks and benefits and discuss alternative treatments if you are pregnant or breastfeeding.

What if the first fecal transplant doesn't work?

If the first fecal transplant is not successful, your doctor may recommend a second transplant. Sometimes, a different delivery method or donor may be considered. Your clinician will discuss the best next steps for your situation.

Sources

• MedlinePlus — Fecal Transplant
• Mayo Clinic — Fecal Transplant
• Cochrane Library — Fecal Transplant