Colonoscopy, Withdrawal time, Polyp detection"/> The Colonoscopic Withdrawal Time is Correlated with the Rate of Detecting Polyps When Performing Colonoscopy
Korean J Gastrointest Endosc > Volume 38(2); 2009 > Article
Korean Journal of Gastrointestinal Endoscopy 2009;38(2): 75-79.
대장내시경검사에서 대장내시경 회수시간과 폴립 발견율과의 관계
안상봉ㆍ한동수ㆍ김선민ㆍ조현석ㆍ변태준ㆍ김태엽ㆍ은창수ㆍ전용철ㆍ손주현
한양대학교 의과대학 내과학교실
The Colonoscopic Withdrawal Time is Correlated with the Rate of Detecting Polyps When Performing Colonoscopy
Sang Bong Ahn, M.D., Dong Soo Han, M.D., Sun Min Kim, M.D., Hyun Seok Cho, M.D., Tae Jun Byun, M.D., Tae Yeob Kim, M.D., Chang Soo Eun, M.D., Yong Cheol Jeon, M.D. and Joo Hyun Sohn, M.D.
Department of Internal Medicine, Hanyang University College of Medicine, Guri, Korea
Abstract


Background/Aims:
The colonoscopic withdrawal time has been proposed as a quality indicator for colonoscopy, and this is based on the recent evidence that the Colon withdrawal time is associated with adenoma detection rate. In this study, we examined the difference of the polyp detection rates between practicing endoscopists, and we analysed certain factors that might lead to such differences, and particularly the colonoscopic withdrawal time.


Methods:
We retrospectively evaluated the colonoscopic procedures that were performed by 7 second-year GI fellows at Hanyang University Guri Hospital. A total of 1,515 colonoscopies were assessed for the polyp detection rate, the insertion time, the withdrawal time, bowel preparation, the size of the detected polyps and the location of polyps.


Results:
The median withdrawal time for the case with no polyps removed was 3.6 to 7.1 minutes. There was a strong positive correlation between the colonoscopic withdrawal times and the polyp detection rates (p<0.001). Furthermore, a longer withdrawal time resulted in discovering a higher percentage of small polyps. On comparing groups, the group of colonoscopists with a withdrawal time longer than 6 minutes had a higher rate of detecting polyps (30.7% vs 18.4%, p<0.001).


Conclusions:
There is wide range of polyp detection rates among practicing colonoscopists and there is strong positive correlation between the colonoscopic withdrawal times and the rate of detecting polyps. A long enough withdrawal time, perhaps 7 minutes, is needed to raise the rate of detecting polyps during colonoscopy. (Korean J Gastrointest Endosc 2009;38:75-79)

Key Words: Colonoscopy, Withdrawal time, Polyp detection
주요어: 대장내시경, 내시경 회수시간, 폴립 발견율
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