Comparison of three colon cleansing methods: evaluation of a randomized clinical trial with 300 ambulatory patients.

In a prospective randomized clinical trial, three colon cleansing methods for colonoscopy were compared with regard to a) side effects, b) patient acceptance, c) residual liquid and stool during colonoscopy, and d) quality of the examination. The patients were randomly assigned to one of the following three groups for colon preparation: Group 1 (n = 100) 4 liters of Golytely, group 2 (n = 102) 2 liters of Golytely combined with Cascara-Salax, and group 3 (n = 98) X-Prep (a Senna preparation) combined with an enema. X-Prep (group 3) caused significantly more abdominal cramps than 4 liters of Golytely (group 1) or 2 liters of Golytely with Cascara-Salax (group 2) (p less than 0.001). Vomiting was most frequent in group 1 (p less than 0.05 vs. group 3). The patients therefore preferred X-Prep to 4 liters of Golytely (p less than 0.01). The cleanest colon was obtained with 4 liters of Golytely, while 2 liters of Golytely with Cascara-Salax was least efficacious. The quality of the examination was equal in groups 1 and 3, and clearly better than in group 2 (p less than 0.01). We thus conclude that while 4 liters of Golytely and X-Prep plus enema have equivalent cleansing efficacy for colonoscopy, patients judged X-Prep to be less unpleasant.