Combined spinal-epidural 2 Duration of labour Foetal outcome 2 Labour analgesia 2 Adult 1 Analgesia, Epidural 1 Analgesia, Obstetrical 1 Anesthesia, Spinal 1 Apgar score 1 Delivery, Obstetric 1 Drug Therapy, Combination 1 Female 1 Humans 1 Labor, Obstetric 1 OPIOID ANALGESIA 1 PROGRESS 1 Pregnancy 1 Prospective Studies 1 Time Factors 1 Treatment Outcome 1 Young Adult 1 adult 1 cesarean section 1 combination drug therapy 1 controlled study 1 emergency 1 epidural analgesia 1 epidural anesthesia 1 female 1 human 1