BACKGROUND: Single site studies in male Veterans in the U.S. reported increased detection of presumptive cancer precursors (adenomas, hyperplastic polyps) in the proximal colon (cecum-splenic flexure) by water exchange. AIMS: Assess the reproducibility of the observation. METHODS: Analysis of secondary outcomes collected prospectively in 3 similarly designed randomized controlled trials using water exchange, water immersion and insufflation (air or carbon dioxide). MAIN OUTCOME: detection rates of adenomas and hyperplastic polyps in proximal, transverse and right colon (cecum-ascending). RESULTS: 704 males (173 screening) were evaluated. In the proximal colon, WE showed increased detection of small adenomas (p=0.009) and adenomas plus hyperplastic polyps (p=0.015) (vs insufflation); increased detection of adenomas plus hyperplastic polyps of any size (p=0.045) and of small size (p=0.04) (vs water immersion). In the right colon water exchange increased detection of small adenomas (19% vs 12.1%, p=0.04) (vs insufflation); small adenomas (19% vs 12%, p=0.038), adenomas plus hyperplastic polyps of any size (25% vs 16.7%, p=0.028) and of small size (23.7% vs 14.6%, p=0.012) (vs water immersion). Water exchange significantly improved bowel cleanliness. Sedation had no impact on lesion detection. CONCLUSIONS: Water exchange is a superior insertion technique for detection of adenomas and hyperplastic polyps primarily in the right colon, especially those of small size.

David Geffen School of Medicine at University of California at Los Angeles Los Angeles CA USA

Department of Surgical Sciences University of Cagliari Cagliari CA Italy

Digestive Diseases Center Vìtkovice Hospital Ostrava Czech Republic

Digestive Endoscopy Unit N S di Bonaria Hospital San Gavino Monreale VS Italy

Digestive Endoscopy Unit St Barbara Hospital Iglesias CI Italy

Sepulveda Ambulatory Care Center Veterans Affairs Greater Los Angeles Healthcare System North Hills CA USA

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$a Cadoni, Sergio $u Digestive Endoscopy Unit, St. Barbara Hospital, Iglesias, CI, Italy. Electronic address: cadonisergio@gmail.com.

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$a Insertion water exchange increases right colon adenoma and hyperplastic polyp detection rates during withdrawal / $c S. Cadoni, P. Falt, S. Sanna, M. Argiolas, V. Fanari, P. Gallittu, M. Liggi, D. Mura, ML. Porcedda, V. Smajstrla, M. Erriu, FW. Leung,

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$a BACKGROUND: Single site studies in male Veterans in the U.S. reported increased detection of presumptive cancer precursors (adenomas, hyperplastic polyps) in the proximal colon (cecum-splenic flexure) by water exchange. AIMS: Assess the reproducibility of the observation. METHODS: Analysis of secondary outcomes collected prospectively in 3 similarly designed randomized controlled trials using water exchange, water immersion and insufflation (air or carbon dioxide). MAIN OUTCOME: detection rates of adenomas and hyperplastic polyps in proximal, transverse and right colon (cecum-ascending). RESULTS: 704 males (173 screening) were evaluated. In the proximal colon, WE showed increased detection of small adenomas (p=0.009) and adenomas plus hyperplastic polyps (p=0.015) (vs insufflation); increased detection of adenomas plus hyperplastic polyps of any size (p=0.045) and of small size (p=0.04) (vs water immersion). In the right colon water exchange increased detection of small adenomas (19% vs 12.1%, p=0.04) (vs insufflation); small adenomas (19% vs 12%, p=0.038), adenomas plus hyperplastic polyps of any size (25% vs 16.7%, p=0.028) and of small size (23.7% vs 14.6%, p=0.012) (vs water immersion). Water exchange significantly improved bowel cleanliness. Sedation had no impact on lesion detection. CONCLUSIONS: Water exchange is a superior insertion technique for detection of adenomas and hyperplastic polyps primarily in the right colon, especially those of small size.

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