title: The dose-range effects of sufentanil added to 0.125% bupivacaine on the quality of patient-controlled epidural analgesia during labor.
abstract: To determine the minimal sufentanil concentration required to improve the quality of patient-controlled epidural analgesia during labor, we compared the efficacy of a combination of 0.125% bupivacaine with 1:800,000 epinephrine and different concentrations of sufentanil in a double-blinded randomized study. Concentrations were no sufentanil (n = 66), 0.078 microg/mL sufentanil (n = 65), 0.156 microg/mL sufentanil (n = 65), 0.312 microg/mL sufentanil (n = 65), and 0.468 microg/mL sufentanil (n = 67). The patient-controlled epidural analgesia setting was a 12-mL bolus dose and a 25-min lockout interval. Pain was scored at 5-6 cm, 7-8 cm, and full cervical dilation by using a 10-cm visual analog scale. At full cervical dilation, the pain scores were lower in the groups receiving a solution of at least 0.156 microg/mL sufentanil. Few differences were observed when using the larger concentrations, except for increased pruritus intensity. The duration of labor and the mode of delivery were similar in each group. Rescue analgesia, which consisted of 6 mL of 0.25% bupivacaine, was infrequent and comparable between groups. The use of the pump did not differ between groups. Adding a small concentration of sufentanil to 0.125% bupivacaine for patient-controlled epidural analgesia during labor improved the quality of analgesia but did not modify the bupivacaine requirement. Reducing the sufentanil concentrations to 0.156 microg/mL decreased the pruritus intensity without reducing analgesia.
  
  
  CONCLUSIONS
  Adding a small concentration of sufentanil to 0.125% bupivacaine for patient-controlled epidural analgesia during labor improved the quality of analgesia but did not modify the bupivacaine requirement. Reducing the sufentanil concentrations to 0.156 microg/mL decreased the pruritus intensity without reducing analgesia.
authors.affiliation: Département d'Anesthésie-Réanimation, Polyclinique Jean-Villar, Bruges-Bordeaux, France. jmbmdphd@club-internet.fr
authors.forename: J M
authors.initials: JM
authors.lastname: Bernard
authors.forename: D
authors.initials: D
authors.lastname: Le Roux
authors.forename: A
authors.initials: A
authors.lastname: Barthe
authors.forename: O
authors.initials: O
authors.lastname: Jourdain
authors.forename: L
authors.initials: L
authors.lastname: Vizquel
authors.forename: C
authors.initials: C
authors.lastname: Michel
mesh_terms: D000328:Adult; D015360:Analgesia, Epidural / Q000009:adverse effects / Q000379:methods*; D016362:Analgesia, Obstetrical / Q000009:adverse effects / Q000379:methods*; D016058:Analgesia, Patient-Controlled / Q000009:adverse effects / Q000379:methods*; D000701:Analgesics, Opioid / Q000008:administration & dosage* / Q000009:adverse effects; D000779:Anesthetics, Local / Q000008:administration & dosage* / Q000009:adverse effects; D002045:Bupivacaine / Q000008:administration & dosage* / Q000009:adverse effects; D004305:Dose-Response Relationship, Drug; D004311:Double-Blind Method; D004359:Drug Therapy, Combination; D005260:Female; D006801:Humans; D009325:Nausea / Q000139:chemically induced; D011247:Pregnancy; D012894:Sleep Stages / Q000187:drug effects; D017409:Sufentanil / Q000008:administration & dosage* / Q000009:adverse effects; D014839:Vomiting / Q000139:chemically induced
chemical_list: D000701:Analgesics, Opioid; D000779:Anesthetics, Local; D017409:Sufentanil; D002045:Bupivacaine