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[Impact assessment of increasing the time of withdrawal of colonoscopy in the detection rate of polyps in our midst].

INTRODUCTION
In 2002, the US Multi-Society Task Force on Colorectal Cancer recommended that the withdrawal phase during colonoscopy should average at least 6-10 min to improve the detecting ratio of polyps. However, these recommendations were based on previous studies with a high colorectal cancer-risk population. The aim of our study is to determine if the implementation of a policy of colonoscopy withdrawal time > or = 6 minutes would be statistically associated with an increase in the colon polyp detection rate.


MATERIALS AND METHODS
We retrospectively evaluated the procedural data from all total colonoscopies performed at our general hospital from January 2006 through July 2009. Since January 2008 we implemented the policy of withdrawal time > or = 6 minutes. We calculated the detection rate and compared data from these period with our baseline consisted of the two years previous period in which withdrawal time was not aware.


RESULTS
We reviewed procedural data from 2004 colonoscopies performed from January 2006 through July 2009; 1042 from the > or = 6 minutes-withdrawal time implementation period and 962 from the two years previous period. We found 162 patients with at least one polyp detected during the > or = 6 minutes-withdrawal time implementation period whereas 144 patients were detected from our baseline. The polyp detection rate was 15.55% from the period with a withdrawal time of e6 minutes versus 16.17 and 15.84% from each year of our baseline. No significant increase (p = 0.955) in the polyp detection rate was detected between the two comparative groups.


CONCLUSION
The implementation of a policy of colonoscopy withdrawal time e6 minutes had no effect on colon polyp detection.