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Polyp miss rates high for colonoscopies done after poor bowel preparation
Date:6/13/2011

OAK BROOK, Ill. June 13, 2011 A new study reports that colonoscopies done with suboptimal bowel preparation are associated with relatively high adenoma (precancerous polyp) miss rates, suggesting that suboptimal bowel preparation substantially decreases colonoscopy effectiveness and may mandate an early follow-up examination. In this study, in the context of suboptimal bowel preparation, of all adenomas identified, 42 percent were discovered only during a repeat colonoscopy, which was necessitated by an inadequate preparation during the first colonoscopy. The study appears in the June issue of GIE: Gastrointestinal Endoscopy, the monthly peer-reviewed scientific journal of the American Society for Gastrointestinal Endoscopy (ASGE).

Colorectal cancer develops slowly, therefore screening for the disease is especially important. Colonoscopy screening allows for the detection and removal of precancerous polyps (small growths in the colon) during the same exam and before the polyps turn into cancer. One of the most important steps in colonoscopy is patient bowel preparation. Adequate preparation ensures that the colon is thoroughly cleaned before the exam so that the physician can clearly see the entire colon to look for abnormalities, such as colon polyps, during the procedure. Cleansing the colon before a colonoscopy is called bowel preparation, or "prep." It involves taking medication that causes diarrhea, emptying the colon. The medication is taken by mouth, and comes in liquid or tablet form. Patients also need to change what they eat during the day or two before the colonoscopy.

The effectiveness of any colorectal cancer screening program is critically dependent on adequate bowel preparation. Suboptimal bowel preparation is associated with a decreased ability to detect adenomas. Additionally, poor preparation increases the total cost of colonoscopy by virtue of the need for repeat examinations at shorter than usual intervals. Subo
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Contact: Anne Brownsey
abrownsey@asge.org
630-570-5635
American Society for Gastrointestinal Endoscopy
Source:Eurekalert

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