“…Numerous studies in the last century demonstrated that epidural analgesia in labour attenuated or eliminated the rises in stress hormones such as epinephrine, 22,39-41 cortisol, 22,41-44 ACTH, 22 peptide hormones 45,46 and angiotensin II. 47 This pacifying effect of epidural analgesia, together with the reduction in harmful maternal hyperventilation, all help to account for the neonatal acidbase benefits described below.…”