Pain Control and Side Effects in Cesarean Section Anesthesia: Comparison of Intrathecal Morphine and Fentanyl

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.

NCT Number	NCT07144410
Lead Sponsor	University of Oradea Collaborators: Oradea Pelican Clinic Hospital
Conditions	Anaesthesia, Spinal
Enrollment	180 participants
Start Date	2025-08-01
Primary Completion	2025-10 (estimated)
Study Completion	2025-10 (estimated)
Updated on ClinicalTrials.gov	2025-08-27