Clinical and Experimental Pediatrics

The Korean Pediatric Society (대한소아청소년과학회)
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Severe vitamin D deficiency in preterm infants: maternal and neonatal clinical features

  • Park, Sook-Hyun (Department of Pediatrics, Kyungpook National University School of Medicine) ;
  • Lee, Gi-Min (Department of Pediatrics, Kyungpook National University School of Medicine) ;
  • Moon, Jung-Eun (Department of Pediatrics, Kyungpook National University School of Medicine) ;
  • Kim, Heng-Mi (Department of Pediatrics, Kyungpook National University School of Medicine)
  • Received : 2015.08.21
  • Accepted : 2015.10.07
  • Published : 2015.11.15
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Abstract

Purpose: We investigated the vitamin D status of preterm infants to determine the incidence of vitamin D deficiency. Methods: A total of 278 preterm infants delivered at Kyungpook National University Hospital between January 2013 and May 2015 were enrolled. The serum concentrations of calcium, phosphorous, alkaline phosphatase, and 25-hydroxyvitamin D (25-OHD) were measured at birth. We collected maternal and neonatal data such as maternal gestational diabetes, premature rupture of membranes, maternal preeclampsia, birth date, gestational age, and birth weight. Results: Mean gestational age was $33^{+5}{\pm}2^{+2}$ weeks of gestation and mean 25-OHD concentrations were $10.7{\pm}6.4ng/mL$. The incidence of vitamin D deficiency was 91.7%, and 51.1% of preterm infants were classified as having severe vitamin D deficiency (25-OHD<10 ng/mL). The serum 25-OHD concentrations did not correlate with gestational age. There were no significant differences in serum 25-OHD concentrations or incidence of severe vitamin D deficiency among early, moderate, and late preterm infants. The risk of severe vitamin D deficiency in twin preterm infants was significantly higher than that in singletons (odds ratio, 1.993; 95% confidence interval [CI], 1.137-3.494, P=0.016). In the fall, the incidence of severe vitamin D deficiency decreased 0.46 times compared to that in winter (95% CI, 0.227-0.901; P=0.024). Conclusion: Most of preterm infants (98.9%) had vitamin D insufficiency and half of them were severely vitamin D deficient. Younger gestational age did not increase the risk of vitamin D deficiency, but gestational number was associated with severe vitamin D deficiency.

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References

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