Participants who request neuraxial labor analgesia are randomized to receive combined spinal-epidural analgesia or epidural analgesia during labor. The investigators collect the data on the duration of three stages of labor, the mode of delivery, neonatal Apgar scores, VAS scores, modified Bromage scores.
The investigators want to compare the safety and efficacy between the combined spinal-epidural analgesia and epidural analgesia during labor.