RT Journal Article SR Electronic T1 #36400 Low dose of intratecal morphine in patients undergoing open liver resection JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP A321 OP A321 DO 10.1136/rapm-2023-ESRA.612 VO 48 IS Suppl 1 A1 Sousa, Cristina A1 Maia, Susana A1 Xavier, Beatriz A1 Carneiro, Alexandra A1 Rocha, Rita A1 Norte, Gustavo A1 Antunes, Eva A1 Sampaio, Catarina YR 2023 UL http://rapm.bmj.com/content/48/Suppl_1/A321.1.abstract AB Please confirm that an ethics committee approval has been applied for or granted: Not relevant (see information at the bottom of this page)Background and Aims Thoracic epidural analgesia (TEA) has traditionally been used for pain management after open liver resection (OLR). Despite its proven analgesic efficacy, TEA may not have the optimal safety profile. Limitations include the risk of epidural hematoma and unplanned delays in postoperative removal of the epidural catheter due to coagulopathy. Intrathecal morphine (ITM) in a multimodal analgesic scheme is an alternative to decrease postoperative pain intensity and opioid requirements. However, there is still no consensus regarding the most appropriate dose that provides effective analgesia while avoiding the risk of side effects. The aim of this work is to assess the analgesic efficacy and the presence of side effects of a low dose of ITM (150 mcg) in patients undergoing OLR. The patients informed consent for publication was obtained.Methods We retrospectively evaluated 3 patients who underwent OLR and that received 150 mcg of ITM as part of a multimodal analgesic scheme.Results Patients were evaluated by an anesthesiologist 24 hours after surgery and reported no pain at rest and slight to no pain at movement, with no need for rescue analgesia. No side effects were documented, namely respiratory depression, nausea, vomiting, urinary retention, or pruritus.Conclusions Low dose of ITM could be an effective strategy to include in a multimodal analgesic scheme to control pain after OLT, with a low risk of respiratory depression. It could avoid the placement of an epidural catheter and the risks associated in case of postoperative coagulopathy.