What is capsule endoscopy?
The patient swallows the capsule endoscope which transmits images of high resolution and magnification as it passes through the digestive tract. These images are recorded and can be viewed on a computer to check for abnormalities.
Capsule endoscopy history and development
Traditional endoscopy and colonoscopy enable a doctor to visualize the upper gastrointestinal tract (esophagus, stomach and duodenum) and the colon, respectively, but are not helpful in studying the entire small intestine.
Technical advances in imaging, optical design and light-emitting diodes enabled the development of capsule endoscopy in the late 1990s. Currently research is underway on the development of magnetically guided capsule endoscopy.
Why is capsule endoscopy done?
Currently, it is recommended after upper endoscopy and colonoscopy have not been successful in finding the cause for
What conditions can be diagnosed with capsule endoscopy?
Capsule endoscopy is especially useful in diagnosing conditions affecting the small intestines including:
- Obscure gastrointestinal bleeding from lesions (angiodysplasia)
- Inflammatory bowel disease (IBD) such as
- Crohn’s disease
- Ulcerative colitis
- Tumors and cancer
- Celiac disease (gluten intolerance)
- Henoch-Schonlein purpura (a disease that causes inflammation and bleeding of the small intestines)
- Intestinal graft-versus-host disease (when immune cells in donor tissue attack the patient’s healthy cells) after small bowel transplant
- Capsule endoscopy may also be indicated in patients with
- HIV displaying gastrointestinal symptoms
- Malabsorptive syndromes other than celiac disease
How is a capsule endoscopy performed?
- The patient must not eat or drink anything for 12 hours prior to the procedure.
- The patient may have to take laxatives to ensure that the digestive tract is clear of gastric contents.
- The patient may go through imaging tests to ensure there are no strictures or obstructions in the bowel.
- The doctor attaches eight antennas to the abdominal skin, connected to a recorder worn around the patient’s waist.
- The patient swallows the capsule endoscope with a little water.
- The capsule sends two images per second as it passes through the gastrointestinal tract.
- The patient may drink liquids two hours after swallowing the capsule and eat after four hours.
- The batteries in the capsule endoscope last for eight hours and the antennas and recorder will be removed after that period.
- The patient will be able to go through normal daily activities during the period.
- The capsule will be excreted along with stools normally.
- The recorded images will be analyzed by the doctor for abnormalities.
How long does it take to pass a capsule endoscopy?
The time taken by the capsule endoscope to pass through the digestive system varies from individual to individual. It may take 8-72 hours, or in some cases, even a week or two.
What are the limitations of capsule endoscopy?
Capsule endoscopy has a few limitations such as
Is capsule endoscopy safe?
Capsule endoscopy is a safe and well-tolerated procedure for most people. It is the safest non-invasive diagnostic tool currently available for examining the small intestine.
What are the complications of a capsule endoscopy?
Capsule endoscopy has few risks. It is safe for even children and the elderly. The procedure’s main risk is the capsule’s retention in the bowel, which may
- cause bleeding
- necessitate surgery for removal
These conditions can be detected by having the patient first swallow a similar-sized capsule (patency capsule) that dissolves in 40 hours. The decision to perform capsule endoscopy can be made based on whether the patency capsule passes out or dissolves in 40 hours.