Effect of a Longer Withdrawal Time or of the Use of a Wide-angle Endoscope on the Adenoma Detection Rate of Screening Colonoscopy

Introduction Colonoscopy outcome is strictly related to the adenoma detection rate. An endoscopy withdrawal time >6min has been suggested to increase the adenoma detection rate since it allows for accurate evaluation of the several hidden areas of the colon. The FUSE endoscope has been demonstrated also to reduce the rate of missed lesions due to its wide angle view.

Aim of the study to evaluate the impact on the adenoma detection rate either of the use of a FUSE endoscope or of interventions directed at optimizing withdrawal time.

to assess the impact of different factors in influencing the withdrawal time

Methods A prospective non-randomized observational single-center study involving consecutive outpatients, aged 18-85 yr, undergoing colonoscopy with different indications. Previous abdominal colon resection, obstruction, inadequate preparation and incomplete examination were exclusion criteria.

In a 3-month period 4 expert endoscopists will performed 500 colonoscopies either with standard endoscope or with FUSE without a dedicated withdrawal time protocol. Colonoscopy withdrawal times will be measured without the endoscopists' knowledge of being monitored.