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  • Title: Correlation among amniotic fluid index (AFI), cesarean section rate, and labor length in inducted pregnancies beyond 41 weeks' gestation with unfavorable cervix.
    Author: Rizzo N, Farina A, Santarsiero G, Morano D, Vitarelli M, Caramelli E, Carinci P, Bovicelli L.
    Journal: Am J Perinatol; 2000; 17(6):319-24. PubMed ID: 11144315.
    Abstract:
    This paper evaluated how the pregnancy after 41 completed weeks' gestation with amniotic fluid index (AFI) > 6 has a slower response to the prostaglandin E2 (PGE2) induction. Eighty-one post-term pregnancies (41 completed gestations' weeks) with unfavorable cervix were considered in this follow-up. Induction was performed by means of intracervical PGE2 gel (Dinoprostone 0.5 mg). After 12 hours, if the cervix was still unfavorable, then another gel administration followed. Cases that had oxytocin administration were excluded from the study. The median time of spontaneous delivery in the overall series was 25 hours, 14 minutes. We had 18 cases of cesarean section (22.2%). In the group of pregnancies with AFI > 6 (60 cases) and in the group with AFI < or =6 (21 cases), the median time of spontaneous delivery was 29 hours, 25 minutes and 23 hours, 39 minutes, respectively (p-value = 0.02). The rate of cesarean sections was 26.67 and 9.52, respectively in the two groups (p-value >0.05). Two out of four cases of cesarean sections for fetal distress belonged to the group of AFI > 6. All the 14 cases of cesarean section for dystocia belonged to the group with AFI > 6. Considering just patients who did not deliver within 12 hours (57 cases), median time of spontaneous delivery was 33 hours and 24 hours 40 minutes for group AFI > 6 (42 cases) and AFI < or =6 (15 cases), respectively (p-value = 0.0009). Thirty-one cases out of 57 had another PGE2 gel administration. Adjusted odds ratio was 0.33 (0.16-0.65, 95% C.I.) for AFI < or =6 versus AFI > 6.
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