Background
Optimal postoperative pain management is essential for enhancing recovery outcomes after cesarean delivery (CD). Regional anesthesia techniques, including ilioinguinal and iliohypogastric (II/IH) nerve blocks, transversus abdominis plane (TAP) block, and quadratus lumborum (QL) block, have gained recognition for their ability to provide effective analgesia while reducing reliance on systemic medications. These approaches are considered both safe and effective, particularly when performed under ultrasound (US) guidance. This study aims to evaluate and compare the efficacy of US-guided II/IH nerve block, TAP block, and QL block in postoperative pain management following elective CD.
Methods
A total of 150 patients aged 18- 45 years old undergoing elective CD were randomly assigned to receive one of the three US-guided nerve block techniques. Patients were allocated at random in three groups by sealed envelopes. A mixture of (0.5 % ropivacaine mixed with adrenaline 2 µ/mL) was injected after the completion of surgery under spinal anesthesia. The primary outcome was the duration of analgesia in hours. The secondary outcomes included pain scores assessment using the Numeric Rating Scale (NRS) at multiple time points postoperatively, opioid consumption, time to first analgesic request, and any complications related to the nerve blocks.
Results
Patients who received QL block reported significantly the longest duration of analgesia (36 h) compared to those who received II/IH block (22.4±9.6 h) with P value <0.001 (95 % CI), or those who received TAP block (28.36±7.7 h) with P value <0.001 (95 % CI). The QL group shows also the lowest NRS scores during the first 24 with no need for morphine compared to those in the other two groups who consumed (0.15±0.07 mg) and (0.068±0.07 mg) in II/IH group and TAP group respectively with P value <0.001(95 % CI).
Conclusion
The QL block offered strong and long-lasting pain relief, eliminating the need for opioids during the first 24 h after CD. The TAP block provided early analgesia but required additional pain control after 12 h. In comparison, the II/IH nerve blocks were effective for a shorter duration, with rescue analgesia needed as early as 6 h postoperatively.
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