Objective: To observe the effect of Cuichan Zhunsheng Decoction (CZD) on the cervical ripening factors in late pregnancy.

Methods: Ninety women with full-term pregnant ready for labor inducing were equally assigned to 3 groups. The treated group was orally treated with CZD, the control group was with pitocin by adding 1 U into 500 mL of 5% glucose for intravenous dripping in 6 h, and the placebo group was orally treated with simulator of CZD as placebo, with the medication lasted for 3 days. Changes of cervical length and width, and neck tube diameter were measured by vaginal B-ultrasonography to estimate the degree of cervical maturation referring to the clinical Bishop scale; meanwhile, changes in blood levels of prostaglandin E2alpha(PGE2alpha), interleukin-8 (IL-8) and endothelin-1 (ET-1) were measured.

Results: The total effective rate on cervical ripening was 96.7% in the treated group, which was significantly superior to those in the control group (83.3%) and the placebo group (26.7%, P < 0.05). The blood levels of PGE2alpha, IL-8, and ET-1 after treatment in the treated group were significantly higher than those in the placebo group (P < 0.05), and levels of PGE2alpha and IL-8 were higher in the control group than in the placebo group (P < 0.05).

Conclusion: CZD can promote the cervical ripening through raising blood levels of PGE2alpha, IL-8 and ET-1, altering the structure of cervical tissue to reduce the cervical tension, which could increase the maturation of cervix, induce delivery sign, so as to elevate the vaginal delivery rate and reduce the percentage of caesarean birth.

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