What is Enteroscopy? 

Enteroscopy is a procedure that helps your healthcare provider to examine your small intestine. It is used to:

  • Identify or treat the source of bleeding in your gut
  • Take a tissue sample (biopsy) from the digestive system for laboratory examination
  • Remove foreign objects or small bowel polyps (abnormal growths of tissue)
  • Widen a narrowed part (stricture) of the digestive tract

This procedure is performed either by using capsule endoscopy or flexible enteroscopy. For capsule endoscopy, you would have to swallow a tiny capsule containing a camera. Although capsule endoscopy is a safe method to examine the small intestine, it does not allow to obtain tissue samples or carry out treatments. Flexible enteroscopy involves two methods:

  • Push enteroscopy: In this method, an endoscope (a long, thin, flexible tube fitted with a camera and light source) is introduced into the gut through the mouth. It goes down into the small intestine till the point where it cannot go further due to sharp bending of the intestine.
  • Device-assisted enteroscopy: This procedure also involves the insertion of an endoscope into your digestive tract. The only difference is that the endoscope has a tube over it that uses a corkscrew (spiral) or balloons (single balloon, double-balloon) to assist in insertion. However, the use of overtubes is limited due to discomfort and side effects. Device-assisted enteroscopy can be performed via the anus or the mouth.
  1. Why is Enteroscopy performed?
  2. How do you prepare for Enteroscopy?
  3. How is Enteroscopy performed?
  4. What do Enteroscopy results mean?

Your healthcare physician may order this test to diagnose diseases of the small intestine. They may ask you to undergo this test in any of the following situations:

  • Unexplained bleeding in the stomach or intestines
  • Initial diagnosis of Crohn’s disease (long-term inflammation of the digestive tract)
  • Tumours in the small intestine
  • Unexplained diarrhoea
  • Abnormal X-ray results
  • To treat people whose small intestine has been identified as the source of bleeding
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You need to be on an empty stomach for this procedure. Hence, your doctor may ask you to avoid eating or drinking (including water) for approximately 12 hours before the procedure. Talk to your doctor to know when to start fasting.

Tell your healthcare provider about any supplements and medications (including over-the-counter drugs) that you take, especially the ones containing aspirin, iron or bismuth subsalicylate products. He/she may adjust the dose of certain medications that you are already on.

A nurse will take you to the procedure room where your pulse, blood pressure and oxygen levels will be monitored. The nurse will administer a sedative that may make you drowsy or they will give you anaesthesia that will put you to sleep. Your doctor will then insert the endoscope via your mouth or anus and advance it to your small intestine using X-ray guidance. He/she may use tools such as forceps, heat probes or other devices to treat the part of the bowel that is accessible. The test usually takes up to two hours.

The side effects commonly associated with the procedure include:

Complications associated with the procedure are: 

  • Tear through the bowel wall
  • Bleeding at the site of biopsy
  • Swelling of the pancreas
  • Reaction to a sedative
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Normal results:

Normally, your doctor will not find any source of bleeding, tumours or other abnormalities in your small intestine.

Abnormal results:

Abnormal results may show up as:

  • Abnormalities in the tissue lining the wall of the small intestine
  • Abnormal length of blood vessels in the small intestine
  • Polyps or cancer
  • Swollen lymph nodes (structures containing cells that fight infection)
  • Presence of a particular immune cell called PAS-positive macrophages
  • Radiation enteritis (damage to small intestine due to radiation)
  • Ulcers

An abnormal result may indicate any of the following conditions or diseases:

  • Coeliac sprue (a disease where your immune cells damage the small intestine)
  • Vitamin B12 deficiency
  • Infectious gastroenteritis (infection in the digestive system)
  • Lymphoma 
  • Small intestinal cancer
  • Whipple disease (an infectious intestinal condition that prevents absorption of certain nutrients from food)
  • Amyloidosis (a condition where an excess of a certain protein called amyloid collects in body organs, affecting their normal functioning)
  • Crohn’s disease
  • Giardiasis (diarrhoea caused by the parasite Giardia)
  • Small intestinal angioectasia (abnormal blood vessels in the small intestine)
  • Tropical sprue (a rare digestive disease affecting the absorption of nutrients from food)

Disclaimer: All results must be clinically correlated with the patient’s complaints to make a complete and accurate diagnosis. The above information is provided from a purely educational point of view and is in no way a substitute for medical advice by a qualified doctor.

References

  1. Kovacs TO, Jensen DM. Gastrointestinal hemorrhage. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 25th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 135.
  2. Vargo JJ. Preparation for and complications of GI endoscopy. In: Feldman M, Friedman LS, Brandt LJ, eds. Sleisenger and Fordtran's Gastrointestinal and Liver Disease. 10th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 41.
  3. Barth B, Troendle D. Capsule endoscopy and small bowel enteroscopy. In: Wyllie R, Hyams JS, Kay M, eds. Pediatric Gastrointestinal and Liver Disease. 5th ed. Philadelphia, PA: Elsevier; 2016:chap 63.
  4. Johns Hopkins Medicine [Internet]. The Johns Hopkins University, The Johns Hopkins Hospital, and Johns Hopkins Health System; Balloon-Assisted Enteroscopy
  5. The Leeds Teaching Hospitals [internet]: NHS Foundation Trust. National Health Service. U.K.; Endoscopy
  6. National Health Service [internet]. UK; Endoscopy
  7. ASGE Technology Committee, Chauhan SS, Manfredi MA, Abu Dayyeh BK, Enestvedt BK, Fujii-Lau LL, et al. Enteroscopy. Gastrointest Endosc. 2015 Dec;82(6):975-90. PMID: 29061266.
  8. Science Direct (Elsevier) [Internet]; Push Enteroscopy
  9. Brigham Health: Brigham and Women's Hospital [Internet]. Harvard Medical School Teaching Hospital. Boston. MA. US; Small Bowel Enteroscopy
  10. Genetic and Rare Diseases Information Center. National Center for Advancing Translational Sciences. National Institute of Health. U.S. Department of Health and Human Services; Crohn's disease
  11. Nemours Children’s Health System [Internet]. Jacksonville (FL): The Nemours Foundation; c2017; Word! Lymph Node
  12. Waheed A, Fatima R, Aziz M. Radiation Enteritis. [Updated 2019 Jun 19]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2020 Jan
  13. Better health channel. Department of Health and Human Services [internet]. State government of Victoria; Gastroenteritis
  14. American Cancer Society [internet]. Atlanta (GA). USA; Lymphoma
  15. Cedars Sinai [Internet]: Cedars Sinai Medical Center. Los Angeles. US; Amyloidosis
  16. Centers for Disease Control and Prevention [internet]. Atlanta (GA): US Department of Health and Human Services; Giardia
  17. American College of Gastroenterology [internet]. Bethesda. Maryland. US; Small Bowel Bleeding
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