Postoperative Pain Control After Cesarean Section by Continuous Infusion Pump System Versus Ropivacaine Hydrogel: A...

Area of Science:

• Anesthesiology and Pain Management
• Obstetrics and Gynecology
• Biomaterials and Drug Delivery

Background:

• Postoperative pain management after cesarean section (CS) is crucial for patient recovery.
• Continuous local anesthetic delivery systems via catheter are common but can have complications.
• Novel drug delivery systems are needed for improved and convenient analgesia.

Purpose of the Study:

• To compare the efficacy of a ropivacaine-loaded poloxamer 407 (P407)-based thermosensitive hydrogel with a continuous catheter system for postoperative pain control after CS.
• To evaluate the combination of these local anesthetic methods with standard intravenous patient-controlled analgesia (IV-PCA).

Main Methods:

• A single-center, prospective randomized controlled trial involving 72 women undergoing CS.
• Participants were randomized to receive either subfascial ropivacaine hydrogel or catheter-based ropivacaine infusion, alongside IV-PCA.
• Primary outcome: Numeric Rating Scale (NRS) pain scores at multiple postoperative time points. Secondary outcomes: time to first NSAID request and cumulative NSAID use.

Main Results:

• No significant differences in NRS pain scores were observed between the hydrogel and catheter groups at any time point.
• The hydrogel group demonstrated a statistically significant delay in the time to first NSAID request (6.3 vs. 5.0 hours).
• The hydrogel group showed significantly higher cumulative NSAID use (2.4 vs. 1.6), suggesting potentially better sustained analgesia, though this requires further interpretation in context of total anesthetic dose.

Conclusions:

• Ropivacaine hydrogel provides postoperative pain control comparable to continuous catheter systems after CS.
• The P407-based hydrogel offers a practical, patient-friendly alternative due to ease of use and absence of catheter-related concerns.
• The hydrogel may represent a viable option for post-cesarean analgesia, potentially with a lower total anesthetic dose.