Research objective. The objective of this research is the study of venous blood flow parameters of lower uterus segment and cervix of uterus at the physiological course of preliminary period. Material and methods. The study was based on the investigation of the course of preliminary period of 90 patients with physiological delivery at term. Results. There is a growing rate of venous blood flow of lower uterus segment and cervix of uterus at rest as well as at peak of contractions. Conclusion. Veins are transformed into structures similar to lacunae at the physiological course of preliminary period. There is a growing rate of venous blood flow of lower uterus segment and cervix of uterus which results in blood storage and seems to be one of the mechanisms leading to cervical dilatation.
Chekhonatskaya М.L, Yannaeva N.£., Grishaeva L.A., Rogozhina I.£., Prodanova E.V., Bakhmach V.O. Alterations in venous blood flow of lower uterus segment and cervix of uterus at physiological course of preliminary period // Saratov Journal of Medical Scientific Research, Vol. 8, Issue 3, 2012, pp. 729-733

The literature review deals with the questions of diagnostics of physiological and pathological course of preliminary period and ready of cervix of uterus for delivery. It also presents the information about prognostic value of cervix of uterus status before delivery, the data were received by means of transabdominal, transvaginal and transperitoneal echography. It also discusses the possibilities of ultrasonic cervicometry in prognosis of risk development of uterus contractive activity anomalies
L.A. Grishaeva, M.L. Chekhonatskaya, I.E. Rogozhina, N.E. Yannaeva Ultrasonic evaluation of cervix of uterus before delivery (literature review) // Saratov Journal of Medical Scientific Research, Vol. 6, Issue 2, 2010, pp. 288-292