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The subject drinks 1.5 litres of oral contrast (3% mannitol) [3] over 30 to 45 minutes before the scan. After that venous access is obtained and Buscopan (hyoscine butylbromide) is given to reduce the gastrointestinal tract movement, thus reducing motion artifact on MRI scan. [4]
Mannitol is a type of sugar alcohol used as a sweetener and medication. [5] [6] It is used as a low calorie sweetener as it is poorly absorbed by the intestines. [5]As a medication, it is used to decrease pressure in the eyes, as in glaucoma, and to lower increased intracranial pressure.
The small bowel feces sign results from stagnation of enteric contents within dilated segments of the small intestine. [1] When intestinal motility is impaired due to obstruction, progressive dehydration of luminal contents occurs, leading to the formation of solid particulate matter that mimics feces. [ 3 ]
The length of the small intestine can vary greatly, from as short as 3 metres (10 feet) to as long as 10.5 m (34 + 1 ⁄ 2 ft), also depending on the measuring technique used. [3] The typical length in a living person is 3–5 m (10– 16 + 1 ⁄ 2 ft). [4] [5] The length depends both on how tall the person is and how the length is measured. [3]
Depending on the level of obstruction, bowel obstruction can present with abdominal pain, abdominal distension, and constipation.Bowel obstruction may be complicated by dehydration and electrolyte abnormalities due to vomiting; respiratory compromise from pressure on the diaphragm by a distended abdomen, or aspiration of vomitus; bowel ischemia or perforation from prolonged distension or ...
Finally, abnormal connections between the bacteria-rich colon and the small bowel can increase the bacterial load in the small bowel. Patients with Crohn's disease or other diseases of the ileum may require surgery that removes the ileocecal valve connecting the small and large bowel; this leads to an increased reflux of bacteria into the small ...
Virtual colonoscopy (VC, also called CT colonography or CT pneumocolon) is the use of CT scanning or magnetic resonance imaging (MRI) to produce two- and three-dimensional images of the colon (large intestine), from the lowest part, the rectum, to the lower end of the small intestine, and to display the images on an electronic display device.
Indications to do this procedure are: unexplained chronic abdominal pain with weight loss, unexplained diarrhea, anemia which is caused by gastrointestinal bleeding or dependent on blood transfusion where the cause cannot be explained despite OGDS or colonoscopy investigations, partial obstruction of bowel/small bowel adhesive obstruction ...