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 20 January 2018

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News

Water exchange method improves adenoma detection rate

Water exchange method significantly improves adenoma detection rate, reports the latest issue of the American Journal of Gastroenterology.

News image

Adenoma detection rate is a key colonoscopy quality indicator in Western clinical literature. 

Dr Hui Jia and colleagues from China's low adenoma detection rate prompted an assessment of novel methods to improve performance. 

Western retrospective reports suggested that water exchange could increase adenoma detection rate.
 
However, most of these studies used pain score or intubation rate as the primary outcome. 

The researchers tested the hypothesis that water exchange significantly increases adenoma detection rate among Chinese colonoscopists, and design a prospective randomized controlled trial using adenoma detection rate as their primary outcome.

The researchers performed this prospective, randomized controlled trial at 6 centers in China. 

Overall adenoma detection rate was 18% in water exchange, and 13% in air insufflation
American Journal of Gastroenterology
Screening, surveillance, and diagnostic cases were randomized to be examined by water exchange or traditional air insufflation method. 

The team's primary outcome was adenoma detection rate.

From 2014 to 2015, 3,303 patients were randomized to water exchange, and air insufflation. 

The baseline characteristics were comparable. 

Overall adenoma detection rate was 18% in water exchange, and 13% in air insufflation. 

The researchers found that adenoma detection rate in screening patients using air insufflation was 26% in males, and 16% in females. 

Adenoma detection rate in screening patients aged >50 years old was 29% in water exchange, and 23% in air insufflation. 

The increase by water exchange was reproducibly observed in all indication categories, and significant in screening and diagnostic cases. 

The limitation imposed by the unblinded investigators was mitigated by comparable inspection times in cases without polyps, similar adenoma per positive colonoscopy, and reproducible enhancement of adenoma detection rate and adenoma per colonoscopy by water exchange across all 8 investigators.

Dr Jia's team comments, "This prospective study confirms Western retrospective data that water exchange significantly improves adenoma detection rate among Chinese colonoscopists."

"Water exchange may be superior to air insufflation for screening colonoscopy in China."

"Colonoscopists elsewhere with low adenoma detection rate might consider evaluating water exchange for performance improvement."

Am J Gastroenterol 2017; 112:568–576
14 April 2017

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