Capsule endoscopy: an alternative to colonoscopy

Colonoscopy is a well-known procedure for screening colorectal cancer and investigating several gastrointestinal symptoms, but many patients find it invasive and uncomfortable. In this article, a consultant gastroenterologist shares insight on an alternative procedure to the traditional colonoscopy, while still getting the same results: the capsule endoscopy.

 

 

An exam of the colorectal organs is often required to investigate issues such as changes in bowel habits or rectal bleeding. Colonoscopy is the most standard and widely used method to do so, and although it is a safe and usually straightforward procedure, the process is not the most pleasant for patients.

Fortunately, there are several effective alternatives to colonoscopy, each with its advantages and limitations. Among these, capsule endoscopy stands out as a particularly promising option. 

 

What is a capsule endoscopy?

Capsule endoscopy is an innovative and less invasive alternative to traditional colonoscopy. It involves swallowing a small, pill-sized camera that takes thousands of pictures as it travels through the gastrointestinal tract. These images are transmitted to an external device worn by the patient, allowing doctors to examine the entire digestive system.

There are three different types of endoscopic camera pills:

• Small bowel capsule endoscopy was the first invented camera pill, designed to directly look inside the small intestine and explore areas where traditional endoscopic procedures cannot reach. It remains to date a very efficient diagnostic test to exclude or diagnose conditions that may cause symptoms of diarrhoea, weight loss or anaemia.
• Colon capsule endoscopy is a double-camera endoscopic pill that aims to look inside the large bowel (colon) to diagnose small growths (polyps) and inflammation (colitis), and to exclude bowel cancer. The bowel needs to be very clean for the doctor to have a good look and patients need to drink strong laxatives for this test.
• Pan-enteric capsule is a procedure similar to the colon capsule but aims to have a look inside both the small and the large bowel. It is usually indicated for patients with suspected or diagnosed inflammatory bowel disease such as Crohn’s disease or patients with unexplained iron deficiency anaemia.

 

 

Pros and cons of capsule endoscopy      

Pros:

• Non-invasive and painless: The capsule is the size of a regular pill and is swallowed easily. It passes through the digestive system naturally, causing no discomfort.
• Comprehensive imaging: Capsule endoscopy can capture images of the entire gastrointestinal tract, including areas that are difficult to reach with traditional endoscopy methods.
• High-resolution images: The capsule takes high-resolution pictures, providing detailed views of the digestive tract. Studies have shown that it can pick up a similar number of polyps compared to a colonoscopy.
• Convenient and less stressful: Patients can go about their daily activities while the capsule is in their system, reducing stress and improving the overall experience.
• Can be done remotely: We have successfully conducted capsule endoscopy entirely virtually and patients can remain at the convenience of their own homes throughout the whole procedure if they wish to. 
• Early diagnosis: Capsule endoscopy can help in the early diagnosis of gastroenterological and colorectal conditions.

 

Cons:

• Retention risk: In rare cases, the capsule may get stuck in the digestive tract, especially in patients with narrowing (strictures) in the small bowel.
• Intensive bowel cleansing: To achieve multiple high-quality images it is important for the bowel to be entirely clean. This means that patients need to drink strong laxatives the day before the procedure and after they swallow the capsule and are not allowed to eat food for a number of hours.
• Limited therapeutic capability: Unlike traditional endoscopy, capsule endoscopy cannot perform biopsies or remove polyps. If a capsule endoscopy shows a significant finding the patient might need to have a colonoscopy to take samples or apply appropriate endoscopic therapy.
• Data analysis: The large number of images captured can be time-consuming for doctors to analyse.

 

Conclusion

While colonoscopy remains a gold standard for investigating the large bowel, several alternatives offer effective and less invasive options. Among these, capsule endoscopy stands out for its non-invasive nature, comprehensive imaging capabilities, and patient convenience. However, it's essential to consult with a healthcare provider to determine the most suitable method based on individual risk factors and preferences.

By exploring these alternatives, patients can make informed decisions about their colorectal health and choose the test that best fits their needs.