Trial Information

A Repeated Instruction by Telephone on the Day Before Colonoscopy Improves the Quality of Bowel Preparation and Colonoscopy Procedure : a Prospective Randomized, Controlled Trial

Colonoscopy is the gold standard in the diagnosis of colorectal disease. The success of
colonoscopy depends on high-quality bowel preparation by patients. Inadequate bowel
cleansing reduces the speed, the cecal intubation rate, and the number of polyps detected.
It also increases costs, mostly due to repeated procedures. The quality of bowel cleansing
has remained suboptimal even though numerous different products and regimens have been
tested and compared in no fewer than six meta-analyses. Therefore, a completely different
approach to improve precolonoscopy bowel cleansing is welcome.

There are many factors effect the bowel preparation such as age, cirrhosis diabetes, drug
compliance, cerebral infarction, dementia, history of major surgery. 20% of patients with
poor bowel preparation were due to bad compliance. Studies found that addressing patient
perceptions with an inexpensive and simple booklet based on the Health Belief Model improved
preparation quality. We assume that doctor retelling the instruction of bowel preparation by
cell phone on the day before colonoscopy would help patient to prepare for colonoscopy and
improve the quality of the bowel preparation.