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What is capsule endoscopy?
Capsule endoscopy is a technology that uses a swallowed video capsule to take photographs of the inside of the esophagus, stomach, and small intestine. For capsule endoscopy, the intestines are first cleared of residual food and bacterial debris with the use of laxatives and/or purges very similar to the laxatives and purges used before colonoscopy. A large capsule-larger than the largest pill-is swallowed by the patient. The capsule contains one or two video chips (cameras), a light bulb, a battery, and a radio transmitter. As the capsule travels through the esophagus, stomach, and small intestine, it takes photographs rapidly. The photographs are transmitted by the radio transmitter to a small receiver that is wornon the waist ofthe patient who is undergoing the capsule endoscopy. At the end of the procedure, approximately 8 hours later, the photographs are downloaded from the receiver into a computer, and the images are reviewed by a physician. The capsule is passed by the patient into the toilet and flushed away. There is no need to retrieve the capsule!
What are the limitations of capsule endoscopy?
While the capsule provides the best means of viewing the inside of the small intestine, there are many inherent limitations and problems with its use, the most important of which is thatthe capsuledoes not allow for therapy. Other problems include:
- Abnormalities in some areas of the intestine are missed because of rapid transit of the capsule and blurred, uninterpretable photographs. The images can also be blurred by retained stool of food debris. Hence the importance of a good bowel preparation prior to the capsule endoscopy.
- At times, transit is so slow that the capsule examines only part of the small intestine before the battery fails. The battery life is about eight hours.
- If abnormalities are discovered that require surgical resection or further investigation, it may be difficult to determine where in the small intestine the abnormality is and thereby help direct therapy.
- If there are narrow areas due to scarring (strictures) or tumors in the small intestine, the capsule can get stuck in the narrow area and cause an obstruction of the intestine that requires surgical removal of the capsule. (For this reason, in patients who are suspected of having a stricture, a self-dissolving, dummy capsule is swallowed first. If the dummy capsule sticks, it can be seen on an x-ray of the abdomen and the location of the stricture determined. Because it dissolves with time, however, the obstruction will resolve without surgery, and the real capsule will not be swallowed.)
- Finally, reviewing the tens of thousands of photographs is very time consuming for the conscientious physician.