Early compared with late neuraxial analgesia in nulliparous labor induction: a randomized controlled trial.
OBJECTIVE
To determine whether early initiation of neuraxial analgesia (anesthetic[s] placed around the nerves of the central nervous system) compared with systemic opioid analgesia, followed later in labor by epidural analgesia, increases the rate of cesarean delivery in nulliparas undergoing induction of labor.


METHODS
Nulliparas undergoing induction of labor who requested analgesia when cervical dilation was less than 4 cm participated in the study. Patients were randomized to neuraxial (early) or systemic opioid (late) analgesia at the first analgesia request. Patient-controlled epidural analgesia was initiated in the early group at the second analgesia request and in the late group at cervical dilation of 4 cm or greater or at the third analgesia request. The primary outcome was the rate of cesarean delivery.


RESULTS
The rate of cesarean delivery was not different between groups (neuraxial [early] 32.7% compared with systemic [late] 31.5%, 95% confidence interval of the difference -3% to 6%, P=.65). A sample size of 30,500 would be required to detect a difference at the observed rate. There were no differences in the mode of vaginal delivery or Apgar scores. Pain scores were significantly lower (median 1 compared with 5 on a 0-10 scale, P<.001) and labor duration shorter (median 528 minutes compared with 569 minutes, P=.047) in the early group. The incidence of reassuring fetal heart rate tracings after analgesia was not different between groups.


CONCLUSIONS
Early-labor neuraxial analgesia does not increase the cesarean delivery rate compared with late epidural analgesia in nulliparas undergoing induction of labor.
Wong
Cynthia A
CA
From the Northwestern University Feinberg School of Medicine, Departments of Anesthesiology and Obstetrics and Gynecology, Chicago, Illinois.
McCarthy
Robert J
RJ
Sullivan
John T
JT
Scavone
Barbara M
BM
Gerber
Susan E
SE
Yaghmour
Edward A
EA
D000328:Adult; D015360:Analgesia, Epidural / Q000379:methods*; D016362:Analgesia, Obstetrical / Q000379:methods*; D000701:Analgesics, Opioid / Q000008:administration & dosage*; D000775:Anesthesia, Spinal; D000779:Anesthetics, Local / Q000008:administration & dosage; D002585:Cesarean Section / Q000706:statistics & numerical data; D004334:Drug Administration Schedule; D005260:Female; D006801:Humans; D007751:Labor, Induced; D010298:Parity; D011247:Pregnancy; D011248:Pregnancy Complications / Q000453:epidemiology*; D055815:Young Adult
D000701:Analgesics, Opioid; D000779:Anesthetics, Local