Intrathecal opioids are frequently combined with local anesthetics to optimize spinal anesthesia for cesarean delivery. Fentanyl, a lipophilic opioid, offers rapid onset and enhanced intraoperative analgesia. However, its postoperative analgesic duration is limited, but in contrast, morphine, a hydrophilic opioid, provides prolonged postoperative pain control but has a slower onset and a higher incidence of adverse effects, notably nausea and vomiting. This prospective, randomized, double-blind, parallel study enrolled 180 parturients scheduled for elective cesarean section, all receiving spinal anesthesia with hyperbaric bupivacaine (7.5-10 mg, adjusted to height) plus either intrathecal fentanyl 25 µg (F group) or intrathecal morphine 100 µg and fentanyl 25µg (M+F group). Primary outcomes include intraoperative and postoperative pain scores, systemic opioid consumption, and patient satisfaction, while secondary outcomes assess the incidence of opioid-related side effects.
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Assessing the perioperative analgesic efficacy
Timeframe: 6 months
Assessing the degree of patient's satisfaction
Timeframe: 6 months