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  • Title: Continuous wound infusion with ropivacaine fails to provide adequate analgesia after caesarean section.
    Author: Kainu JP, Sarvela J, Halonen P, Puro H, Toivonen HJ, Halmesmäki E, Korttila KT.
    Journal: Int J Obstet Anesth; 2012 Apr; 21(2):119-24. PubMed ID: 22341892.
    Abstract:
    BACKGROUND: Continuous wound infusion with local anaesthetic has been used in post-caesarean pain management with conflicting results. We carried out a study comparing three groups: continuous ropivacaine wound infusion, intrathecal morphine with saline wound infusion and saline wound infusion only. METHODS: Sixty-six women undergoing elective caesarean section under combined spinal-epidural anaesthesia were randomly allocated to receive intrathecal morphine with saline wound infusion or 48 h continuous wound infusion with either ropivacaine or saline. All parturients received oral ketoprofen and intravenous oxycodone patient-controlled analgesia. Consumption of oxycodone, visual analogue scale pain scores (0-10 cm), patient satisfaction, side effects and recovery parameters were recorded for 48 h in a double-blind manner. RESULTS: Continuous wound infusion with ropivacaine failed to reduce oxycodone consumption or pain scores compared with saline control. In the first 24 h intrathecal morphine reduced mean oxycodone consumption compared to the ropivacaine wound infusion group (26 mg vs. 48 mg, P=0.007) and saline wound infusion group (26 mg vs. 45 mg, P=0.021). The first 24-h mean pain score was also lower in the intrathecal morphine group vs. the saline wound infusion group (1.3 vs. 2.2, P=0.021). Pain scores were not significantly different between intrathecal morphine and ropivacaine wound infusion groups. Pruritus was more common with intrathecal morphine. CONCLUSION: Compared to saline control, continuous wound infusion with ropivacaine failed to reduce the use of intravenous oxycodone patient-controlled analgesia or pain scores. Intrathecal morphine decreased oxycodone consumption by 46% in the first 24 h after surgery when compared to continuous ropivacaine wound infusion.
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