ПРОГРАММНО-АППАРАТНЫЙ КОМПЛЕКС ДЛЯ ОЦЕНКИ ФУНКЦИОНАЛЬНОГО СОСТОЯНИЯ МАТЕРИ И ПЛОДА

Abstract

Text abstract Mother’s and fetus’s health are very important in present time. With timely diagnosis perinatal pathology, birth injuries, antenatal stillbirths and newborn perinatal death can be prevented. At the moment in the world there are no complexes which enable monitoring of the fetus without any risk to his health. So the main aim of this work is development of hardware and software system to assess the functional status of the mother and fetus by the analysis of the signals recorded from the abdominal electrodes. Objectives: 1) to formulate the requirements to noninvasive monitoring system and functional state assessment of mother and fetus. 2) to develop algorithms and software for monitoring system and functional state assessment of mother and fetus. 3) to determine fetus functional state at 32–33 week in women with uncomplicated pregnancies and in women with placental insufficiency in the compensation stage and subcompensation. The system concept is based on fetal heart rate recognition and analysis. Fetal heart rate has been extracted from the mixed signals received from abdominal electrodes. This technique is passive for a body so there is no research time limit. Device for simultaneous registration of fetal and maternal electrocardiogram is high sensitive bioamplifier with low level of intrinsic noises, high input resistance and suppression of inphase noises more than 80 DB. Digital processing of a signal is carried out by microcontroller of the registration module and personal computer. Preprocessing is carried out in microcontroller by receiving signals from the analog-to-digital converter on the increased sampling rate, digital filtering, decimation. With the help of the developed complex two-stage study was conducted. At first stage the fetal cardiointervalogram (i.e. fetus heartbeat period and the distribution pattern of these intervals in time) was studied. Second stage was carried out to search additional criteria of fetal functional state assessment with placental insufficiency in the pregnant with hyperandrogenism in the third trimester. As result, it was defined, that parameters of heart rate structure at 32–35 weeks of gestation allows to assess the risk of functional disorders and development of fetus hypoxia with sensitivity Se = 80% and specificity Sp = 73%.