Abstract
Introduction: Vitamin D deficiency is highly prevalent during pregnancy and in premature infants. This study was done to investigate the maternal and infantile levels of vitamin D in preterm infants.
Methods: Using available sampling during 2018-2020, the maternal and umbilical cord serum levels of vitamin D were measured in 294 premature infants in Ghaem Hospital, Mashhad, Iran. A researcher- made questionnaire consisting of neonatal demographic and clinical characteristics was used as the data collection tool. Both maternal and placental vitamin D levels were categorized into four classes: severe deficiency (vitamin D<10 ng/ml), moderate deficiency (10.1≤vitamin D≤20 ng/ml), mild deficiency (20.1≤vitamin D≤30 ng/ml) and normal (vitamin D >30.1ng ml).
Results: Vitamin D deficiency was seen in 89% of premature infants (46.6% severe, 30.6% moderate, and 11.9% mild). Serum levels of vitamin D were 18.28±13.94 ng/ml and 14.10±9.70 ng/ml in mothers and infants, respectively. The infants below and above 32 weeks exhibited vitamin D values of 10.97±6.31 ng/ml and 18.05±11.64 ng/ml, respectively. The difference in vitamin D levels between boys (12.59±8.40 ng/ml) and girls (16.05±11.45 ng/ml) was found to be significant (P=0.009). Moderate and severe vitamin D deficiency was more common at earlier pregnancy ages (P=0.001).
Conclusion: Vitamin D deficiency is more common and severe in preterm infants and their mothers. Controlling vitamin D levels during pregnancy, especially in women at risk of preterm labor and preterm infants, may help reduce prematurity problems.
Keywords: Premature infants, vitamin D, gestational age, vitamin D deficiency, pregnancy, preterm labor and infants.
Graphical Abstract
[http://dx.doi.org/10.5812/ircmj.4513] [PMID: 23984003]
[http://dx.doi.org/10.1016/j.otohns.2008.09.018] [PMID: 19041514]
[http://dx.doi.org/10.3390/nu8050301] [PMID: 27213444]
[http://dx.doi.org/10.1038/nrendo.2010.226] [PMID: 21263449]
[http://dx.doi.org/10.1111/j.1753-4887.2010.00306.x] [PMID: 20646224]
[http://dx.doi.org/10.1007/s00223-005-0009-8] [PMID: 16622587]
[http://dx.doi.org/10.5812/ijp.84798]
[http://dx.doi.org/10.29252/ijrm.16.7.429] [PMID: 30234182]
[http://dx.doi.org/10.1080/14767058.2020.1762560] [PMID: 32482110]
[http://dx.doi.org/10.1093/jn/133.5.1668S] [PMID: 12730483]
[http://dx.doi.org/10.3329/jhpn.v29i2.7857] [PMID: 21608424]
[http://dx.doi.org/10.3345/kjp.2015.58.11.427] [PMID: 26692878]
[http://dx.doi.org/10.1542/peds.2008-1862] [PMID: 18977996]
[http://dx.doi.org/10.1159/000072768] [PMID: 12964424]
[http://dx.doi.org/10.1172/JCI110072] [PMID: 6894152]
[http://dx.doi.org/10.1542/peds.2007-1894] [PMID: 18676559]
[http://dx.doi.org/10.22038/IJN.2016.6662]
[http://dx.doi.org/10.1097/AOG.0000000000000621] [PMID: 25569002]
[PMID: 25973031]
[http://dx.doi.org/10.1136/archdischild-2013-303999] [PMID: 23852093]
[http://dx.doi.org/10.1016/j.ejogrb.2014.03.008] [PMID: 24702903]
[http://dx.doi.org/10.1016/j.jsbmb.2014.11.013] [PMID: 25448734]
[http://dx.doi.org/10.1007/s00774-011-0264-x] [PMID: 21384110]
[PMID: 24124195]
[http://dx.doi.org/10.1111/j.1471-0528.2006.01120.x] [PMID: 17206962]
[http://dx.doi.org/10.1159/000151473] [PMID: 18836259]
[http://dx.doi.org/10.1155/2011/216217] [PMID: 22190843]
[http://dx.doi.org/10.19082/6208] [PMID: 29588821]
[http://dx.doi.org/10.1371/journal.pone.0172533] [PMID: 28212393]
[http://dx.doi.org/10.3345/kjp.2017.60.8.248] [PMID: 29042866]
[http://dx.doi.org/10.1530/EJE-13-0842] [PMID: 24451081]
[http://dx.doi.org/10.1016/j.placenta.2010.08.015] [PMID: 20863562]
[http://dx.doi.org/10.1016/S0140-6736(75)90430-4] [PMID: 53550]
[http://dx.doi.org/10.1210/edrv-2-3-264] [PMID: 7023922]
[http://dx.doi.org/10.1093/ajcn/71.5.1317s] [PMID: 10799409]
[PMID: 3921937]