 This study was designed to demonstrate that AQUAVAN is effective in providing adequate sedation in elderly patients undergoing colonoscopy as well as to assess the safety profile of AQUAVAN versus that of midazolam. Prior to the procedure, patients received fentanyl citrate for pain management followed five minutes later by AQUAVAN Injection for sedation. Throughout the procedure, study personnel assessed the patients vital signs and depth of sedation. After the procedure, the patient, physician, and an evaluator were asked to complete satisfaction surveys. 