A Comparison of Epidural Analgesia: Continuous Infusion Versus Programmed Intermittent Boluses

10 ml of 0.1% bupivacaine (2 ml of 0.5% bupivacaine and 50 mcg / ml fentanyl in 7 ml of normal saline solution)

0.1% bupivacaine and fentanyl 2 mcg / ml (8-12 ml / hour)

A 0.1% bupivacaine and fentanyl 2 mcg / ml (8-12ml) bolus will be administered each hour at a rate of 500ml/hour

Upon patient request, rescue bolus of 8-10 ml of 0.1% bupivacaine will be administered.

If needed, during the second phase (9-10 centimeters of cervical dilation) a 2% lidocaine without epinephrine (8-10 cc) bolus will be administered.