Aim. Evaluation of health state in newborns whose mothers were at risk of pre-eclampsia, depending on vitamin D level.
Methods. Study materials included peripheral blood from pregnant women and umbilical cord blood of newborns. Vitamin D level was measured by enzyme-linked immunoassay kits of BIOMEDICAGRUPPE company (Germany). Intrauterine fetal state was studied with the use of ultrasonography.
Results. Analysis of the study proved that vitamin D level in the umbilical cord blood correlates with its concentration in the mother’s blood. In women at pre-eclampsia risk decreased calcium level and vitamin D deficiency in the blood were detected. Administration of 2,000 IU of vitamin D and 1.5 g of calcium from the beginning of 2nd trimester of pregnancy resulted in reduction of frequency and severity of pre-eclampsia and its complications, including intrauterine growth retardation. Use of vitamin D in combination with calcium supplementation was shown to significantly improve unfavorable perinatal outcomes in women at high risk of pre-eclampsia, reducing by 3 times hypoxia and cerebral fetal lesions frequency that proves the vitamin D importance for functioning of mother-placenta-fetus system.
Conclusion. Children of patients at risk of pre-eclampsia not taking vitamin D and calcium supplementation have lower birth weight and Apgar score, they have more frequent perinatal complications.
This article discusses negative effects of vitamin D deficiency on low birthweight preterm and full-term newborns. Results of the studies on vitamin D provision to pregnant women and their newborn children are addressed. Vitamin D deficiency is highly prevalent in pregnant women and newborns. It was demonstrated that inadequate antenatal provision of a fetus with vitamin D may result in congenital rickets and neonatal seizures due to hypocalcemia in newborns and also accounts for increased rates of necrotic enterocolitis, bronchopulmonary dys-plasia, and impaired growth and development as well as higher risk of lower respiratory tract infections (i.e., bronchiolitis, pneumonia) during the first year of a child’s life. In addition, it was shown that persistent vitamin D deficiency in future years may be associated with recurrent respiratory infections, allergic (e.g., atopic dermatitis, asthma, etc.), autoimmune, endocrine, and psycho-neurological disorders. Preventive and therapeutic strategies for vitamin D deficiency in low birthweight preterm and full-term newborns since neonatal period are discussed.Keywords: vitamin D, vitamin D deficiency, calcidiol, low birthweight newborn, preterm newborn, full-term newborn.For citation: Zakharova I.N., Mal’tsev S.V., Zubkov V.V. et al. Vitamin D, low birthweight preterm and full-term newborns: time for a paradigm shift. Russian Journal of Woman and Child Health. 2020;3(2):142–148. DOI: 10.32364/2618-8430-2020-3-2-142-148.
This paper reviews the effects of vitamin D deficiency on pregnant women and newborns. It was demonstrated that vitamin D deficiency in pregnant women is associated with higher risks of threatened preterm labor, placental insufficiency, preeclampsia, gestational diabetes, bacterial vaginosis, and impaired uterine contractility as well as higher rate of C-sections. Vitamin D insufficiency in newborns is associated with inadequate bone mineralization and also results in metabolic disorders, hypocalcemic seizures, bronchopulmonary dysplasia, necrotic enterocolitis, sepsis, mental and developmental disorders, and higher risks of various (infectious, allergic etc.) disorders. Optimal vitamin D dosing regimen in pregnant women and newborns is discussed.KEYWORDS: pregnancy, vitamin D, vitamin D insufficiency, newborn, complications of pregnancy, preeclampsia, gestational diabetes.FOR CITATION: Zakharova I.N., Mal’tsev S.V., Zubkov V.V. et al. Effect of vitamin D on the pregnancy and the health of newborns and infants: state-of-the-art. Russian Journal of Woman and Child Health. 2020;3(3):174–181. DOI: 10.32364/2618-8430-2020-3-3-174-181.
This article deals with the problem of the flow around a thin profile with perforations on the contours. The perforations are simulated using a “sink-and source” hydrodynamic model. The formulas for calculating the main vector of the flow pressure forces on the profile as well as that of the moment of the profile regarding the front edge have been obtained.
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