Article Text

Download PDFPDF
Original article
Telephone-based re-education on the day before colonoscopy improves the quality of bowel preparation and the polyp detection rate: a prospective, colonoscopist-blinded, randomised, controlled study
  1. Xiaodong Liu1,
  2. Hui Luo1,
  3. Lin Zhang1,
  4. Felix W Leung2,3,
  5. Zhiguo Liu1,
  6. Xiangping Wang1,
  7. Rui Huang1,
  8. Na Hui1,
  9. Kaichun Wu1,
  10. Daiming Fan1,
  11. Yanglin Pan1,
  12. Xuegang Guo1
  1. 1Xijing Hospital of Digestive Diseases, Fourth Military Medical University, Xi'an, Shannxi, China
  2. 2Sepulveda Ambulatory Care Center, Veterans Affairs Greater Los Angeles Healthcare System, North Hill, California, USA
  3. 3David Geffen School of Medicine, UCLA, Los Angeles, California, USA
  1. Correspondence to Professor Xuegang Guo or Yanglin Pan, Xijing Hospital of Digestive Diseases, Fourth Military Medical University, 169 Changle West Road, Xi'an, Shannxi 710032, China; xuegangguo{at} or


Background Despite advances in bowel preparation methods, the quality of bowel preparation in some patients undergoing colonoscopy remains unsatisfactory. The effect of telephone re-education (TRE) on the day before colonoscopy on the quality of bowel preparation and other outcome measures had not been studied.

Methods A prospective colonoscopist-blinded study was conducted. All patients received regular instructions during a visit to discuss colonoscopy. Those scheduled for colonoscopy were randomly assigned to receive TRE on the day before colonoscopy (TRE group) for bowel preparation or no TRE (control group). The primary outcome was the rate of adequate bowel preparation. The secondary outcomes included polyp detection rate (PDR), non-compliance with instructions, and willingness to repeat bowel preparation.

Results A total of 605 patients were randomised, 305 to the TRE group and 300 to the control group. In an intention-to-treat analysis of the primary outcome, adequate preparation was found in 81.6% vs 70.3% of TRE and control patients, respectively (p=0.001). PDR was 38.0% vs 24.7% in the TRE and control group, respectively (p<0.001). Among patients with successful colonoscopy, the Ottawa scores were 3.0±2.3 in the TRE group and 4.9±3.2 in the control group (p<0.001). Fewer patients who showed non-compliance with instructions were found in the TRE group (9.4% vs 32.6%, p<0.001). No significant differences were observed between the two groups with regard to willingness to have a repeat bowel preparation (p=0.409).

Conclusions TRE about the details of bowel preparation on the day before colonoscopy significantly improved the quality of bowel preparation and PDR.


Statistics from

Request Permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.