Prosepective,Randomized, controlled study enrolling full termed parturients admitted for vaginal delivery. At the sencond stage of labor: 3cm of cervix dilatation, patients will be randomized in 2 groups: * ESP group: patients will receive ultrasound guided, bilateral ESP Block performed at the level of the 3 rd Lumbar transverse process. * Epidural Analgesia Group: Patients will have a classic lumbar continuous epidural analgesia.
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Analgesia during labor
Timeframe: change in VAS score 1 hour after the beginning of labor