To evaluate the influence of narrow-banding imaging on the detection rate of polyps in the ascending colon in patients with different intestinal cleanliness.

A retrospective study was performed on 1029 patients who underwent colonoscopy at the Endoscopy Center of the No. 1 People′s Hospital of Suqian from January 2016 to January 2017. These cases were divided into two groups by intestinal cleanliness score: A and B. Group A had an Ottawa intestinal cleanliness score of 0 or 1 (n = 549), and group B had an intestinal cleanliness score of 2 (n = 480). In group A, 260 patients underwent NBI to detect ascending colon polyps (subgroup A1), and 289 underwent conventional imaging (subgroup A2). Similarly, 231 patients in group B received NBI (subgroup B1), and 249 patients underwent conventional imaging (subgroup B2). The detection rate of ascending colon polyps and examination time were compared between subgroups A1 and A2 and subgroups B1 and B2.

The detection rate of ascending colon polyps and examination time were 6.92% (18/260) and (127.93±12.21) seconds in subgroup A1, 3.11% (9 /289) and (126.17±11.32) seconds in subgroup A2, 5.19% (12/231) and (125.45±15.16) seconds in subgroup B1, and 4.42% (11/249) and (128.88±8.26) seconds in group B2, respectively. The detection rate of ascending colon polyps was significantly higher in subgroup A1 than in subgroup A2 (P<0. 05), although there was no significant difference in the examination time between the two subgroups. Either the detection rate of ascending colon polyps or examination time did not differ significantly between subgroups B1 and B2 (P>0. 05).

Narrow-banding imaging can significantly increase the detection rate of ascending colon polyps in the case of intestinal cleanliness score of 0 or 1, but not in patients with an intestinal cleanliness score of 2.