Patient-Controlled Sedation Versus Anesthesiologist-Administered Sedation

Inclusion Criteria: 1. Undergoing elective, outpatient colonoscopy 2. Age ≥ 18, \<90 3. Meet criteria for conscious sedation (HUP Policy 1-12-11, Appendix F), as determined by the attending gastroenterologist and confirmed by the anesthesiologist by review of history 4. Able to give informed consent Exclusion Criteria: 1. Have a history of allergy or adverse reaction to propofol or remifentanil 2. Have a condition which would pose an elevated risk for administration of propofol, including primary hyperlipoproteinemia, diabetic hyperlipemia, and pancreatitis. 3. Female of child-bearing potential (under 50 without surgical sterilization) 4. Unable to understand the use of Patient Contolled Sedation