The provision of vitamin D in parturients and newborn infants in the mother-child dyad under the conditions of the Subarctic Zone of the Russian federation in the winter season


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Abstract

Objective. To assess the provision of vitamin D in newborn infants and parturients in the mother-child dyad in the city of Arkhangelsk in the winter season. Subjects and methods. A total of 55 mother-child pairs from the city of Arkhangelsk were examined during the cross-sectional study. The level of 25(OH)D was determined in umbilical cord blood and parturients. Results. Vitamin D def iciency was found in the mothers: only 19 (35%) of the examined women had vitamin D levels above the recommended values (30 ng/ml). The newborns were provided with vitamin D much worse than their mothers: only 4 (7%) children had a normal level of vitamin D; 20 (36%) had the level that corresponded to its deficiency; severe deficiency and insufficiency were noted in 17(31%) and 14 (26%) newborn infants, respectively. The level of 25(OH)D in a baby was shown to be clearly related to its provision in his/her mother. Severe vitamin D deficiency was recorded in all children born to mothers with severe deficiency (25(OH)D levels below 10 ng/ml); the children born to mothers with deficiency (25(OH)D levels of 10-19 ng/ml) were observed to have severe in vitamin D deficiency in 43% of cases and insufficiency in 57%; those born to mothers with vitamin D def iciency (25(OH)D levels of 20-30 ng/ml) were found to have severe vitamin deficiency in 40% of cases, deficiency in 47%, and insufficiency in 13%. Conclusion. The critically low levels of vitamin D in umbilical cord blood (96% of the children have 25(OH) D levels below 30 ng/ml) indicate that it is necessary to introduce a system of urgent remedial measures using adequate correction schemes for both pregnant women and newborns who should be given vitamin D supplements from birth if their mothers have been found to have vitamin D deficiency. It is advisable to determine the baseline level of 25(OH)D in all pregnant women for the prescription of an appropriate dose of vitamin D.

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About the authors

Svetlana Ivanovna Malyavskaya

Northern State Medical University

Email: Malyavskaya@yandex.ru
MD, professor, head of the Department of Pediatrics

Viktoria Grigoryevna Karamyan

K.N. Samoilova Arkhangelsk Clinical Maternal Hospital

Email: rds@atnet.ru
Chief Physician

Galina Nikolaevna Kostrova

Northern State Medical University

Email: kostrovagn@yandex.ru
Candidate of Medical Science, associate professor of the Department of Normal Physiology

Andrey Viktorovich Lebedev

Northern State Medical University

Email: andruleb@yandex.ru
MD, associate professor of the Department of Pathological Physiology

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