Yee et al identified predictors for inadequate bowel preparation for colonoscopy. The authors are from the University of British Columbia and Victoria General Hospital in Canada,
Outcome: inadequate bowel preparation (fecal matter present, may or may not be able to detect all polyps greater than 5 mm in diameter)
fair with fecal matter but able to find all polyps greater than 5 mm; poor with fecal matter is inability to detect all polyps greater than 5 mm)
Predictors for an inadequate preparation:
(1) history of stroke or dementia
(2) opioid use
(3) male gender
(4) therapy with calcium channel blocker
(5) therapy with an antidepressant
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