LXRs, Cholesterol Metabolism and Uterine Dystocia

Inclusion Criteria: * Patients undergoing C-section for a dystocia: 2 to 3 hours of stagnation in labor progress are observed (ie no increasing dilation, and uterine contractions less that 3-5 per 10 minutes) in spite of measures taken to overcome dystocia (oxytocin injection and artificial breaking of waters) * the child is alive * the child does not have apriori known malformations that could interfere with a vaginal birth * foetus in cephalic position * full term pregnancy (\>= 37 weeks of amenorrhea) * single birth * patient has signed consent * patient is affiliated with a social security system Exclusion Criteria: * vaginal birth * programmed C-section * C-section is chosen because the fetus has a cardia rhythm problem, and there is no stagnation in the labor process * multiple pregnancy * the child is in a breech position * premature birth (\<37 weeks amenorrhea) * in utero fetal death * fetal malformation known before birth that could interfere with a vaginal birth * non french-speaking patient (impossible to correctly inform the patient) * patient under guardianship