• Christopher John Murphy, Jewel SamadderNNUniversity of Utah Health Sciences Center, Salt Lake City, UT, USA., Kristen Cox, Ronak Iqbal, Brian So, Daniel Croxford, and John C Fang.
• University of Utah Health Sciences Center, Salt Lake City, UT, USA.
• Dig. Dis. Sci. 2016 Jan 1; 61 (1): 46-52.

BackgroundInadequate bowel preparation is the most common cause of failed colonoscopy, and repeat failure occurs in more than 20 % of follow-up attempts. Limited data suggest that next-day follow-up may reduce the risk for repeat inadequate preparation.ObjectiveEvaluate differences in prep quality with next-day follow-up after initial inadequate preparation.DesignRetrospective study.SettingAcademic center.PatientsOutpatient screening and surveillance colonoscopies between 7/2002 and 6/2007.InterventionComparison of next-day versus any other day ("non-next-day") repeat colonoscopy outcomes.Main Outcome MeasurementsAronchick scale, polyp and adenoma detection rates.ResultsOf 20,798 initial colonoscopies, 857 (4.1 %) had inadequate preparation. 460 (54 %) were lost to follow-up. One hundred and fourteen (13 %) had next-day and 283 (33 %) had non-next-day colonoscopy with mean follow-up of 8.8 months. On follow-up examination, 29.8 % of next-day and 23.3 % of non-next-day colonoscopies had inadequate bowel preparation (p = 0.48). The adenoma detection rate for the next-day group improved from 3.5 to 38.6 % on follow-up, compared to 20.5 and 36.8 % in the non-next-day group. There was no significant difference between groups in detection of total adenoma (p = 0.73) or advanced adenomas (p = 0.20) on follow-up examinations.LimitationsRetrospective design, differences in baseline colonoscopy characteristics.ConclusionThe results confirm the need for repeat examination after a colonoscopy with inadequate bowel prep, as there was substantial increase in adenoma detection on follow-up. There were no differences in outcomes between next-day versus non-next-day colonoscopy. These data support repeating after inadequate colonoscopy within 1 year as convenient for patient and physician.

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