Outcomes of Intrathecal Analgesia in Colorectal Surgery

All intrathecal injections were performed preoperatively using a 22g or 25 g Whitacre or 24g Sprotte spinal needle. The IA regimen, medication(s) and dose(s), was at the discretion of the attending anesthesiologist, and consisted of one of the following regimens: (1) hydromorphone + local anesthetic (IA-L), or (2) hydromorphone only (IA-O). In patients receiving IA, no other interventional locoregional analgesic techniques (such as rectus sheath blocks or transversus abdominis plane blocks) were utilized.