Diagnostic value of i-Scan high definition endoscopy for screening polypoid lesions in right hemicolon / 中华消化内镜杂志

ABSTRACT

Objective To explore the diagnostic value of the i-Scan for detection of polypoid lesions in right hemicolon during colonoscopy. Methods A total of 200 patients who underwent colonoscopy in Beijing Shijitan Hospital from January 2015 to December 2015 were enrolled. After completion of the first colonoscopy in right hemicolon, a second withdrawal was performed, using white light mode ( white light group, n=93) and i-Scan mode ( i-scan group, n=96) to detect polypoid lesions in the proximal colon. The detection rates of polyp and adenoma were compared between the two groups. Results During the twice withdrawal, compared with white light group, more polyps and adenomas were detected in i-Scan group (1. 469 VS 1. 011, P=0. 028; 0. 979 VS 0. 624,P=0. 039). The proportion of patients with more polyps and adenomas in the i-Scan group was significantly higher than that in the white light group [ 37. 5％( 36/96) VS 22. 6％ ( 21/93) , P=0. 025;24. 0％ ( 23/96) VS 11. 8％ ( 11/93) ,P=0. 030] . i-Scan mode detected more small polyps with diameter<5 mm [ 84. 0％ ( 42/50 ) VS 58. 3％ ( 14/24 ) , P=0. 016 ] . However, there were no differences between the two groups in the size, location, and morphology of the detected adenomas ( all P>0. 05) . The polyp detection rates of the i-Scan group and white light group were 61. 5％ (59/96) and 48. 4％ (45/93), respectively (P=0. 071), and the adenoma detection rates were 47. 9％ (46/96) and 35. 5％ (33/93), respectively (P=0. 083). Conclusion I-Scan mode can increase the detection rate of polyps and adenomas in right hemicolon, and improve detection of polypoid lesions and bsmall polyps in patients with multiple polyps and adenomas.