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Revista de Gastroenterología del Perú

Print version ISSN 1022-5129


DAZA CASTRO, Erlison Mauricio et al. Double review of the right colon vs single review during colonoscopy for the detection of colon polyps and adenomas: systematic review of the literature. Rev. gastroenterol. Perú [online]. 2023, vol.43, n.4, pp.309-318.  Epub Dec 20, 2023. ISSN 1022-5129.

Colonoscopy screening is an effective method to prevent colon cancer through the detection of polyps on which colon cancer develops in a higher percentage; however, the detection of these lesions varies in the different segments of the colon and the detection rate of them in the right colon is usually lower.


The objective of this study is to evaluate whether double endoscopic revision of the right colon during colonoscopy is a mechanism to improve its performance in terms of polyp detection rate (TDP) and adenoma detection rate (ADR).

Materials and methods:

Systematic review and meta-analysis of the literature including randomized clinical trials that evaluated repeat right-sight examination by colonoscopy compared to standard view to improve detection of polyps and adenomas. The protocol for this decision was published in PROSPERO under the code CRD42022356509.


Five studies involving 2729 participants were included. Polyp detection was reported in 585/1197 patients (48.87%) after the second review, compared with 537/1206 (44.52%) of patients who received a single examination (p< 0.05), for a combined RR of 1.09 (95% CI: 0.97-1.23) (I2 was 44%). Detection of adenomas was reported in 830/1513 patients (54.75%) after the second review, compared with 779/1509 (51.62%) of patients who received a single examination (p < 0.05), for a combined RR of 1.06 (95% CI: 1.00-1.13) (I2 was 0%).


Second examination of the right colon by colonoscopy may have a modest improvement in the detection of polyps and adenomas.

Keywords : Colon, ascending; Colonoscopy; Screening.

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