Parameters influencing the quality of colonoscopy in Belgium : a critical evaluation

In relation to recent implementation of colorectal cancer screening programs at the regional level, quality assessment of colonoscopy gains more interest in Belgium. In order to evaluate quality indicators of colonoscopies in Belgium, we retrospectively analysed data about colonoscopies performed between 2002-2010.

Coded data concerning number of medical procedures and polypectomy were provided by the Intermutualistic Agency (IMA). This database was used to calculate different quality indicators such as polyp detection rate (PDR), use of sedation, amount of procedures and time interval according to physician and center type.

Considerable differences in polyp detection rate (PDR) exist between different physicians and centers. Mean PDR significantly correlated with the number of colonoscopies performed each year. A minimum of 106 colonoscopies per year was identified to maintain competence. Recuperation rate for polyps was low, and time intervals between colonoscopies were generally too short in comparison to European and international guidelines.

In absence of a central colonoscopy registry in Belgium, our results were based on reimbursement data. Other quality parameters, although accuracy is questionable (eg. bowel cleansing and withdrawal time) are not systematically registered. Despite these difficulties, we were able to demonstrate that a minimum amount of 106 colonoscopies per year is necessary to maintain competence. The results from this large database can be used as a foundation to work out a quality colonoscopy bundle.