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Differences in detection rates of adenomas in screening vs surveillance colonoscopies

The latest issue of Clinical Gastroenterology & Hepatology reports differences in detection rates of adenomas and serrated polyps in screening vs surveillance colonoscopies.

News image

The adenoma detection rate is an important quality indicator originally developed for screening colonoscopies.

However, it is unclear whether the adenoma detection rate should be calculated using data from screening and surveillance examinations.

The recommended benchmark adenoma detection rate for screening examinations is 20%.

There are few data available to compare adenoma detection rates from surveillance vs screening colonoscopies.

Adenoma detection rate was higher in surveillance colonoscopies
Clinical Gastroenterology & Hepatology

Dr Joseph Anderson and colleagues from Canada used a population-based registry to compare adenoma detection rates from screening vs surveillance colonoscopies.

The serrated polyp detection rate, a potential new quality indicator, also was examined.

By using data from the statewide New Hampshire Colonoscopy Registry, the team excluded incomplete and diagnostic colonoscopies, and those performed in patients with inflammatory bowel disease, familial syndromes, or poor bowel preparation.

The researchers calculated the adenoma detection rate and serrated polyp detection rate from 9100 colonoscopies.

The team found that the adenoma detection rate and serrated polyp detection rate were compared by colonoscopy indication, age at colonoscopy, and sex.

The research team found that adenoma detection rate was significantly higher in surveillance colonoscopies than screening colonoscopies.

The team observed this difference for both sexes and age groups.

There was a smaller difference in the serrated polyp detection rate of screening vs surveillance colonoscopies.

Dr Anderson's team concludes, "In a population-based study, we found that addition of data from surveillance colonoscopies increased the adenoma detection rate but had a smaller effect on the serrated polyp detection rate."

"These findings indicate that when calculating adenoma detection rate as a quality measure, endoscopists should use screening, rather than surveillance colonoscopy, data."

Clin Gastroenterol Hepatol 2013: 11(10): 1308-1312
04 October 2013

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