[Dynamics of indicators of vitamin D status in children with cystic fibrosis of the Moscow region for 2016-2018].

Vitamin D deficiency is widespread in patients with cystic fibrosis (CF). From 2016 to 2018, prophylactic doses of vitamin D were prescribed for the patients of the Russian cystic fibrosis Center in accordance with the National cystic fibrosis consensus and they were informed about the role of vitamin D deficiency. The aim of the study was to conduct a comparative analysis of the frequency of deficiency and insufficiency of vitamin D in children with CF of different ages in Moscow region in 2016 and 2018. Material and methods. The study involved 115 patients with CF at the age of 0-18 in 2016 and 211 children of the same age in 2018. All children underwent determination of 25(OH)D in blood serum by ELISA. Results and discussion. The frequency of vitamin D deficiency and insufficiency [25(OH)D level <30 ng/ml] in CF patients in 2016 was 64.3%, and in 2018 - 48.7%. Among children of 0-3 years normal serum 25(OH)D levels (>30 ng/ml) were registered in 62.5% in 2016 and in 62.2% in 2018, in children of 4-11 years - 28.8% in 2016 and 58.1% in 2018, among adolescents (11-18 years) - 11.8 and 30.2%, respectively. Conclusion. Comparative analysis showed a positive dynamics in reducing the proportion of CF patients with vitamin D deficiency and insufficiency against the background of continuous use of prophylactic doses of cholecalciferol and educational work for the period from 2016 to 2018. However, in a significant proportion of patients (48.7%), vitamin D level did not reach the norm in 2018 that requires the correction of preventive doses and increase in patient compliance.