Five Key Measures to Ensure Quality Colonoscopy

A task force established by the American College of Gastroenterology (ACG) and the American Society for Gastrointestinal Endoscopy (ASGE) issued updated recommendations highlighting what they consider to be the highest-priority quality indicators for colonoscopy, a list that for the first time includes adequate bowel preparation and sessile serrated lesion detection rate (SSLDR).

“Endoscopy teams now have an updated set of guidelines which can be used to enhance the quality of their colonoscopies and should certainly use these current quality measures to ‘raise the bar’ on behalf of their patients,” task force member Nicholas J. Shaheen, MD, MPH, Division of Gastroenterology and Hepatology, The University of North Carolina at Chapel Hill, said in a statement.

The task force published their recommendations online on August 21 in both The American Journal of Gastroenterology and GIE Gastrointestinal Endoscopy. It represents the third iteration of the ACG/ASGE quality indicators on colonoscopy recommendations and incorporates new evidence published since 2015.

“The last set of quality indicators from this group was 9 years ago. Since then, there has been a tremendous amount of new data published in colonoscopy quality,” Ziad F. Gellad, MD, MPH, professor of medicine, Duke University Medical Center, Durham, North Carolina, told Medscape Medical News.

“Keeping up with that data is a challenge, and so guidelines such as these are important in helping clinicians synthesize data on quality of care and implement best practices,” said Gellad, who was not involved with the task force.

Two New Priority Indicators 

The task force identified 15 quality indicators, divided into preprocedure, intraprocedure, and postprocedure. It includes five “priority” indicators — two of which are new.

One is the rate of adequate bowel preparation, preferably defined as a Boston Bowel Preparation Scale score of ≥ 2 in each of three colon segments or by description of the preparation as excellent, good, or adequate. It has a performance target of > 90%.

“Inadequate bowel preparation substantially increases the cost of colonoscopy delivery and creates risk and inconvenience for patients, thus warranting a ranking as a priority indicator,” the task force wrote.

Gellad told Medscape Medical News the addition of this priority indicator is “notable because it highlights the importance of bowel prep in high-quality colonoscopy. It also shifts more of the responsibility of bowel prep from the patient to the practice.”

The second new quality indicator is the SSLDR, which was selected due to its ability to contribute to cancer prevention.

Based on available evidence, the task force recommends a current minimum threshold for the SSLDR of 6%. “This is expected to be revised upward as evidence of increasing detection occurs,” they wrote.

Gellad said the addition of SSLDR is “an important advance in these recommendations. We know that serrated adenomas are a precursor for colorectal cancer and that the detection of these subtle lesions is variable.

“Providing a benchmark encourages practices to measure the detection of serrated adenomas and intervene when rates are below benchmarks. Prior to these benchmarks, it was difficult to know where to peg our expectations,” Gellad added.

Changes to the Adenoma Detection Rate 

The adenoma detection rate (ADR) remains a priority indicator in the update, albeit with changes.

To keep the ADR measurement consistent with current screening guidelines, the task force now recommends that the ADR be measured starting at age 45 years rather than age 50 years.

“ADR plays a critical role in evaluating the performance of the colonoscopists,” task force lead Douglas K. Rex, MD, a gastroenterologist at Indiana University School of Medicine in Indianapolis, said in the statement.

“It is recommended that ADR calculations include screening, surveillance, and diagnostic colonoscopy but exclude indications of a positive noncolonoscopy screening test and therapeutic procedures for resection or treatment of known neoplasia, genetic cancer syndromes, and inflammatory bowel disease,” Rex explained.

The task force recommends a minimum ADR threshold of 35% (40% in men and 30% in women) and that colonoscopists with ADRs below 35% “undertake remedial measures to improve and to achieve acceptable performance.”

Additional Priorities 

The cecal intubation rate (CIR) — the percentage of patients undergoing colonoscopy with intact colons who have full intubation of the cecum with photo documentation of cecal landmarks — remains a priority quality indicator and has a performance target of ≥ 95%.

“A trained colonoscopist should achieve a high CIR with a very high level of safety,” the task force wrote. “Low CIRs have been associated with higher PCCRC [postcolonoscopy colorectal cancer] rates.” 

The final priority indicator is the rate of using recommended screening and surveillance intervals, which carries a performance target of ≥ 90%.

“We recommend that quality improvement efforts initially focus on high-priority indicators and then progress to other indicators once it is ascertained that endoscopists are performing above recommended thresholds, either at baseline or after corrective interventions,” the task force wrote.

“The priority indicators are absolutely important for practices to implement,” Gellad told Medscape Medical News.

“There is compelling evidence that these measures are correlated with clinically important outcomes, particularly ADR,” he added. “Many practices already capture this data, and the changes in ADR calculation make measurement less burdensome. Hopefully, this will encourage more practices to collect and report these measures.” 

Rex is a consultant for Olympus, Boston Scientific, Braintree Laboratories, Norgine, GI Supply, Medtronic, and Acacia Pharmaceuticals; receives research support from Olympus, Medivators, Erbe USA, and Braintree Laboratories; and is a shareholder in Satisfai Health. Shaheen had no relevant disclosures. Gellad has consulted for Merck & Co. and Novo Nordisk and is a co-founder of Higgs Boson Inc.