Data analysis issue

The aim of the investigators study is to demonstrate the association between fetal cardiac rhythm abnormalies after epidural analgesia and the maternal systemic transfer of ropivacaine and/or sufentanil.

Inclusion Criteria:

• 18 years old or more

• nulliparous

  _ one fetus

• head first

• spontaneous labor

• epidural analgesia

• no fetal cardiac rhythm abnormalies before the epidural analgesia

• no active management of labor during 30 minutes after the epidural analgesia induction

• at term

• signature of the consent form

Exclusion Criteria:

• pathological pregnancy
• low maternal blood pressure during the 30 minutes after the epidural analgesia
• uterin contraction which last for 5 minutes or more
• more than 6 uterin contractions during a 10 minutes period
• Ropivacaine contraindication
• sufentanil contraindication