A new water instillation method for colonoscopy without sedation as performed by endoscopists-in-training.

Background: Colonoscopy may be associated with discomfort when performed without sedation. A study was conducted to determine whether instillation of water into the colon at the beginning of the procedure reduces intubation time as well as patient discomfort and pain.

Methods: Colonoscopy was performed in 259 patients by 3 endoscopists-in-training with limited experience.