The investigators assessed the use of a colonoscopy instructional video to improve both bowel
preparation and education prior to procedure. Preceding studies have been vague, pinning
patient education via diagrams and text as both pivotal and useless for compliance in bowel
preparations. These studies however lacked assessment of comprehension prior to procedure.
This is a prospective study of diverse, inner city outpatient university center, first time
colonoscopy patients given 1 of 2 on-site videos and written/verbal instruction.
Experimentals saw a 5 min video on the purpose of colonoscopy, bowel preparation,
pre-colonoscopy diet, and proper laxative use. Controls saw a 5 min video from the same
spokesperson on upper endoscopy; which was trivial. Both groups were given a quiz within 30
days of the colonoscopy on demographics, and 14 test questions about colonoscopy and
preparation. Subsequently, endoscopists used the additive Ottawa scale to rate quality of
preparation (range 0-14) via: fluid (0=sm,1=mod, 2=lg) and cleanliness in each the right, mid
and rectosigmoid colon, (0=excellent, 1=good, 2=fair, 3=poor, 4=inadequate).