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  • Title: A randomized controlled trial of pudendal nerve block for pain relief after episiotomy.
    Author: Aissaoui Y, Bruyère R, Mustapha H, Bry D, Kamili ND, Miller C.
    Journal: Anesth Analg; 2008 Aug; 107(2):625-9. PubMed ID: 18633043.
    Abstract:
    BACKGROUND: Pain from episiotomy or perineal tears during childbirth is associated with significant pain in the postpartum period. We performed this randomized, double-blind, controlled trial to investigate the efficacy of nerve stimulator-guided unilateral pudendal nerve block for pain relief after episiotomy. METHODS: Forty women who gave birth vaginally with mediolateral episiotomy were randomized to receive pudendal nerve block with 15 mL of either ropivacaine 7.5 mg/mL (pudendal group) or normal saline (control group) after repair of the episiotomy. Episiotomy pain was assessed with a visual analog scale at rest at 3, 6, 12, 24, and 48 h postepisiotomy and during activities (walking and sitting). Breakthrough pain (visual analog scale >30 mm) was treated with niflumic acid suppositories 700 mg every 12 h. The primary outcome variables were pain scores at rest and during activities over 48 h postpartum. RESULTS: Demographic and obstetric characteristics were not different between groups. Successful pudendal nerve stimulation was achieved in all patients. Patients in the pudendal group reported significantly lower pain scores at rest than those in the control group at 3, 6, 12, 24, and 48 h after delivery (P < 0.05). They also reported better analgesia while sitting and walking (P < 0.05). Additional analgesia was required by three patients (15%) in the pudendal group versus 17 patients (85%) in the placebo group (P < 0.001). CONCLUSION: This study demonstrates that nerve stimulator-guided unilateral pudendal nerve block with ropivacaine 7.5 mg/mL is associated with decreased pain and need for additional analgesics during the first 48 h postepisiotomy.
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