Issue: 2023, Vol. 28, No. 2

L. H. Bezirova, А. I. Malyshkina, А. О. Nazarova, V. S. Loginova, S. B. Nazarov

BIOELECTRIC PARAMETERS OF CONTRACTILE ACTIVITY OF THE UTERUS IN THE III TRIMESTER OF PREGNANCY

Keywords

pregnancy, childbirth, prematurity, preterm labor, uterine bioelectric activity, electrohisterography, uterine contractile activity

Abstarct

The electrohisterography (EHG) as a method of the evaluation of uterine contractile activity (UCA) is applicable in obstetric practice, because its disorders are also of great interest in current obstetrics. Standard parameters of EHG indices are not yet developed, and it determines the relevance of this study. The question of spatial asymmetry of the distribution of uterine bioelectric activity (UBA) which is registered from the surface of anterior abdominal wall remains unexplored and requires further research. Objective – to estimate the indices of amplitude and spectral analysis of the uterine bioelectric activity in women in the III trimester of pregnancy. Material and methods. UBA indices are registered in 34 women in the III trimester of pregnancy in gestation period from 28 to 34 weeks with an uncomplicated course of pregnancy; the patients are on the books of the antenatal clinic of the Ivanovo Research Institute of Maternity and Childhood by V.N.Gorodkov. The authors use a prototype of a portable electrohysterograph which is developed jointly with «Neurosoft» Ltd. (Ivanovo) within the framework of the state task of the Ministry of Health Care of the Russian Federation, according to the two-channel method with subsequent computer analysis of the signal. Results and discussion. It is determined that EHG results (index of maximal amplitude of amplitude analysis and average amplitude, spectral analysis parameters – maximal, average, full amplitudes of the spectrum and average frequency) are symmetrical in the right and left parts of the uterus and they are closely interrelated with each other. Conclusion. For the first time an assessment of the indicators of amplitude and spectral analysis of uterine bioelectric activity in women in the III trimester of pregnancy is performed. It is revealed that UBA indicators in the terms of 28–34 weeks of physiologically occurring pregnancy are symmetrically distributed between its right and left parts. Thus the application of EHG in the examination program for pregnant women is proved to be one of the perspective methods of UCA evaluation and requires further research of diagnostic and prognostic significance of these parameters.

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• Vestnik_2_2023-23-26