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Oxycodone PCIA reduces visceral pain vs. sufentanil after repeat cesarean sectionBetter Pain Relief Found for Women After Repeat C-Section

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Key Takeaway
Consider oxycodone PCIA for visceral pain after repeat cesarean section, based on one RCT showing benefit over sufentanil.

This randomized controlled trial enrolled 100 women undergoing elective repeat cesarean section. Participants received patient-controlled intravenous analgesia (PCIA) with either oxycodone (50 mg/100 ml) or sufentanil (100 μg/100 ml). The primary outcome was maximum visceral pain Numerical Rating Scale (NRS) scores during the first 24 hours postoperatively.

The oxycodone group had significantly lower maximum visceral pain NRS scores at 24 hours (2.2 ± 0.6) compared to the sufentanil group (3.4 ± 0.7). The adjusted effect size was β = −1.13 (95% CI: −1.41 to −0.85, P < 0.001). Visceral pain during oxytocin infusion was also significantly lower in the oxycodone group at all time points (P < 0.001).

Secondary outcomes showed shorter time to autonomic activity in the oxycodone group (23.7 ± 5.1 h vs. 26.3 ± 3.4 h, P = 0.004), lower postoperative neutrophil-to-lymphocyte ratio (7.2 ± 2.1 vs. 9.1 ± 3.7, P = 0.003), and fewer PCIA presses (P = 0.002).

Safety and tolerability were not reported. The study was limited to a 24-hour follow-up and a single-center setting with 100 participants. While the results support oxycodone's efficacy for postoperative visceral pain in this population, the evidence is from one RCT, and long-term outcomes are unknown.

Why Pain Feels Different

Cesarean sections are common, but repeat surgeries bring new challenges. The body has already been through the process once.

Tissue in the abdomen may be scarred from the first operation. This makes the pain feel sharper and deeper.

A hormone called oxytocin is used to help the uterus close. It can make this internal pain worse.

The New Drug Switch

Doctors usually use a drug called sufentanil for pain control. It works well for many patients.

But this new study looked at a different option. They tested oxycodone instead of the standard choice.

The team wanted to see if it handled the deep pain better. They focused on women having a second surgery.

How It Stops Pain

Pain signals travel through nerves to the brain. Think of it like a traffic jam on a busy road.

Opioid receptors act like locks that stop the pain signal. Oxycodone fits into these locks very well.

It blocks the pain before it becomes overwhelming. This helps the body relax during recovery.

What The Data Says

The trial included 100 women undergoing elective repeat surgery. They were split into two groups for the test.

One group got oxycodone through a pain pump. The other group received sufentanil through the same pump.

Researchers tracked pain levels for the first 24 hours. They also watched how the body reacted to oxytocin.

The results were clear and consistent across the board. Women taking oxycodone reported significantly lower pain scores.

The average pain score was 2.2 for oxycodone. It was 3.4 for the standard sufentanil group.

This difference might seem small on paper. But for a patient in pain, it is a huge relief.

This doesn’t mean this treatment is available yet.

The oxycodone group also had less inflammation in their blood. They needed fewer presses on the pain pump.

Recovery of autonomic activity happened faster too. This suggests the body settled down quicker.

Why You Should Wait

Experts say this is a promising step forward. It offers a new tool for doctors to manage pain.

However, it is not ready for every hospital yet. More research is needed to confirm safety.

Doctors must weigh the benefits against potential side effects. It is not a one-size-fits-all solution.

What Comes Next For Care

This study is just the beginning of the journey. Researchers need to test it on larger groups.

They must also check long-term effects on mothers and babies. Approval takes time to ensure safety.

The goal is to make pain management safer for everyone. We are moving in the right direction.

More trials will likely follow to expand the data. Regulatory bodies will review the findings carefully.

If approved, this could become a standard option soon. Patients should discuss this with their care team.

Research takes time to move from the lab to the clinic. But the progress is encouraging for the future.

Study Details

Study typeRct
EvidenceLevel 2
PublishedApr 2026
View Original Abstract ↓
ObjectiveThe global cesarean section (CS) rate is on the rise, with ratio of repeat CS becoming more common in China following the two-child policy. Postoperative visceral pain, particularly intense in repeat CS parturients and exacerbated by oxytocin, remains inadequately managed. Oxycodone, acting via κ-opioid receptors, has shown promise in relieving visceral pain, but its efficacy in repeat CS populations is unclear, which was explored in this study.MethodsThis randomized controlled trial enrolled 100 parturients undergoing elective repeat CS, randomized to patient-controlled intravenous analgesia (PCIA) with oxycodone (50 mg/100 ml) or sufentanil (100 μg/100 ml). Primary outcomes were maximum visceral pain Numerical Rating Scale (NRS) scores during 0–24 h postoperatively. Secondary outcomes included visceral pain NRS during oxytocin administration on postoperative days 1–2, postoperative inflammatory markers (neutrophil-to-lymphocyte ratio, NLR), time to autonomic activity and PCIA presses. This trial was registered with the Chinese Clinical Trial Registry (ChiCTR2400087624; July 31 2024)ResultsSignificantly lower maximum visceral pain NRS scores in the oxycodone group during 24h after surgery compared to sufentanil group (2.2 ± 0.6 vs. 3.4 ± 0.7, P < 0.001), and also at all time points during oxytocin infusion (P < 0.001). The oxycodone group also had shorter time to autonomic activity (23.7 ± 5.1 vs. 26.3 ± 3.4 h, P = 0.004), lower postoperative NLR (7.2 ± 2.1 vs. 9.1 ± 3.7, P = 0.003), and fewer PCIA presses (P = 0.002). Multivariate linear regression confirmed oxycodone as an independent predictor of reduced maximum postoperative pain (adjusted β = −1.13, 95%CI:−1.41 to−0.85, P < 0.001).ConclusionIn conclusion, oxycodone effectively alleviates postoperative visceral pain and mitigates inflammatory responses in repeat CS parturients, making it a preferred choice for postoperative analgesia in this population.
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