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Brazil is one of the countries that carry out cesarean delivery in the world. The pain after cesarean delivery (CD) is one of the main concerns of parturient. Intrathecal Morphine (ITM) is widely used for the treatment of pain after CD; however, the optimal dose with minimal side effects is to be established. Objectives: To compare the analgesia and side effects resulted by three different doses of ITM as part of a multimodal regimen for post-cesarean delivery analgesia. Methods: One hundred ninety-four patients were sampled in this randomized, double-blinded, three-arm study (group 0.075: ITM 0.75 mg; group 0.1: ITM 0.1 mg and group 0.15: ITM 0.15 mg). All patients received intravenous dexamethasone, dipyrone and ketoprofen. The primary endpoint was pain intensity measured at rest and on movement, while the secondary endpoint was overall satisfaction with pain relief, the incidence of nausea and vomiting, intensity of pruritus, and the use of additional tramadol, antipruritic and antiemetic use within 24 hours after postoperation. Results: The three groups showed similar pain intensity at rest and on movement. The pain intensity on movement was significantly higher than at rest in the groups (p 0.001). There were no significant differences among the groups regarding secondary endpoint. Conclusions: Our findings suggest that in cases of an elective CD, 0.075 mg of ITM produces postoperative analgesia of similar quality that provided by 0.1 or 0.15 mg ITM. The patients should have a multimodal analgesia approach that includes: ITM, anti-inflammatory agents and access to additional systemic analgesic if necessary.

Three Different Doses of Intrathecal Morphine as Part of a Multimodal Regimen for Post-Cesarean Delivery Analgesia: A Randomized Double-Blinded Trial