Overview Intrathecal Opioids for Colorectal Resection Status: Recruiting Trial end date: 2022-01-15 Target enrollment: Participant gender: Summary This research study is being done to determine the optimal dose of spinal morphine and hydromorphone in patients undergoing minimally-invasive (i.e., surgery performed through small entry sites and using cameras) colorectal surgery. Phase: Phase 4 Details Lead Sponsor: Mayo ClinicTreatments: HydromorphoneMorphine