Enhanced recovery after caesarean section: an intrathecal morphine dosing study

Area of Science:

• Obstetrics and Gynecology
• Anesthesiology
• Pharmacology

Background:

• Enhanced recovery protocols aim to optimize patient outcomes after surgery.
• Intrathecal morphine (ITM) is used for postoperative analgesia in cesarean sections.
• Optimizing ITM dosage is crucial for balancing pain relief and side effects.

Purpose of the Study:

• To compare the effectiveness and side effect profiles of three different doses of intrathecal morphine (ITM) in obstetric patients undergoing cesarean section.
• To evaluate ITM's role within an enhanced recovery protocol.

Main Methods:

• A prospective cohort study involving 574 female patients (ASA 2, >18 years) undergoing repeat elective cesarean sections.
• Patients received 100 mcg, 125 mcg, or 150 mcg of ITM.
• Outcomes included oral morphine equivalents, opioid-free rates, ITM-related side effects, duration of analgesia, pain scores, and length of stay.

Main Results:

• All ITM doses provided effective analgesia, with higher doses correlating with increased side effects.
• The 150 mcg group showed lower opioid consumption and higher opioid-free rates at 24 and 48 hours compared to lower doses.
• The 100 mcg group had significantly less nausea and vomiting, while the 150 mcg group reported more pruritus.

Conclusions:

• All evaluated doses of intrathecal morphine effectively manage pain after cesarean delivery.
• The 100 mcg ITM dose presents the optimal balance between analgesic efficacy and a favorable side effect profile.
• Lower ITM doses may be associated with a trend towards functional limitation.