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  • Title: Uterine activity and ductus venosus flow velocity patterns during the first stage of labor.
    Author: Szunyogh N, Zubor P, Dokus K, Galo S, Visnovsky J, Danko J.
    Journal: Int J Gynaecol Obstet; 2006 Oct; 95(1):18-23. PubMed ID: 16828486.
    Abstract:
    OBJECTIVE: To analyze the effects of uterine contractions on ductus venosus (DV) pulsatility during the first stage of labor. METHODS: Twenty healthy women were examined. Measurements were taken at three stages of cervical dilatation (<4 cm, 4-7 cm and >or=8 cm) during and between contractions. Peak velocity during ventricular systole (S) and atrial contraction (A), pulsatility index for veins (DV PIV), ductus venosus index (DVI) and the S/A ratio were measured. RESULTS: The DV was observed successfully in 16 cases. The mean S velocity did not change significantly (64 cm/s during and 65 cm/s between contractions). The mean A velocity decreased significantly from 35 cm/s measured between contractions to 29 cm/s during contractions (P<0.0001). The mean DV PIV and DVI were significantly higher during contractions (0.72 and 0.55) than between contractions (0.57 and 0.45) (P<0.0001). There were no significant differences in means between stages of cervical dilatation. CONCLUSION: Significant differences during and between uterine contractions can be observed in DV pulsatility during normal labor.
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