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Background. The physiological regulation of the uterine contractile activity changes with age, which leads to an increased number of prolonged labor and emergency caesarean sections in women giving birth at the age of 35+. One of the modern approaches to correct the function of the reproductive system is the use of from cell cultures. CM from glial cell culture contains neurotrophic factors that play an important role in maintaining the contractile function of the uterus. Current cell culture technologies include cryopreservation. Objective: to research experimentally the effect of CM obtained from intact and cryopreserved cultures of glial cells on the contractile activity of the uterus in rats of different reproductive ages. Materials and methods. The monolayer cell culture was obtained from the dorsal root ganglia of neonatal piglets and cryopreserved in the presence of cryoprotectant dimethyl sulfoxide. CM from native and cryopreserved cultures were collected for 28 days, after which fractions with a molecular weight of < 30 kDa were obtained from them by ultrafiltration. Rats at the age of 6 and 14 months, which corresponds to reproductive age and late reproductive age (LRA), were intraperitoneally injected with 0.2 ml of media from intact (ICM) or cryopreserved (CCM) cultures for 9 days. On the 30th – 32nd day after the end of the administration of CM animals were slaughtered and the uterine contractile activity was determined by the organ bath method, the relative area of myometrium and density of myocytes by histological method, the average area of labeling with specific antibodies to smooth muscle actin by immunohistochemical method. The statistical significance of differences was assessed by the Mann–Whitney test. Results. It was found that spontaneous, OT-, and KCl-induced tension of isometric contraction of the uterus in intact LRA rats decreased by 19, 20, and 14%, respectively, compared with intact reproductive aged animals. After the introduction of ICM and CCM in LRA animals, normalization of isometric contraction parameters was observed. This effect was realized against the background of an increase in the area of the myometrium, the density of myocytes, and actin expression. Conclusions. Intra-abdominal administration of CM from glial cell culture increases the uterine contractile activity in LRA rats. This effect is realized by increasing the relative area of the myometrium, the density of myocytes, and the area of expression of smooth muscle actin. The effect of media from intact and cryopreserved cultures on the contractile activity of the uterus was similar, which makes it possible to use low-temperature culture storage technologies to obtain CM without losing its biological effect.

The paper presents an analysis of echocardiographic data of patients with PDA having different hemodynamic significance. Presently, the concept of “degree of hemodynamic significance” remains controversial. Criteria for determining the hemodynamic significance of PDA in term infants are not described. In our work, we used a classification of three degrees of hemodynamic significance: non-hemodynamically significant PDA – insignificant, moderately hemodynamically significant – moderately significant and large PDA – hemodynamically significant PDA. Aim – to work out an algorithm for determining the degree of PDA hemodynamic significance for prediction of its further development. The study involved children under 18 years old (80% of them ‒ children under 3 years old) who were examined in the cardiac surgery department of the SI “IGUS n.a.V.T. Zaytsev NAMS of Ukraine” during 2013-2017 yy. Gestational age (from 37 weeks), the presence of left to right PDA shunt, absence of a ASD shunt and other congenital heart defects served as enrollment criteria for the trial. Two prognostic tables were formed with the main criteria for determining hemodynamic significance of PDA by the sum of the signs according to gradations (insignificant, moderately significant and hemodynamically significant) as an outcome of the trial. Based on the determination of the main and additional criteria of hemodynamic significance and the strength of their influence, a diagnostic algorithm is formed for a patient with PDA with the possibility of predicting a further clinical scenario. For determination of hemodynamic significance, an increase in pulmonary gradient with an information index of 1.135 and a prognostic factor of +5.90/-1.75 were dominant, while the left ventricular dilatation located from the A4C with an informational index of 1.020 and a prognostic coefficient of +3.69/-2.50 dominated in determining the degree of hemodynamic significance in the presence of secondary changes. The proposed mechanism for determining the level of hemodynamic significance of PDA for children with borderline changes will predict more precisely the development of the disease, determine the patient’s observation tactics and regulate the decision-making process of surgical intervention.