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Licensed Unlicensed Requires Authentication Published by De Gruyter August 31, 2020

Reassessing vitamin D supplementation in preterm infants: a prospective study and review of the literature

Amnon Zung, Chani Topf-Olivestone, Eric S. Shinwell, Lilach Hofi, Ada Juster-Reicher and Orna Flidel-Rimon

Abstract

Objectives

Recommendations for vitamin D (VitD) intake and target serum levels of 25(OH)D in preterm infants are diverse. We hypothesized that preterm infants with low birth weight (BW) have low dietary intake of VitD and therefore should be supplemented with higher amounts of VitD.

Methods

Infants with BW < 2 kg were supplemented with 600 units of VitD a day during the first 2–6 weeks of life, whereas infants with BW>2 kg continued with the routine supplementation of 400 units of VitD daily. Serum levels of 25(OH)D, calcium, phosphorous, alkaline phosphatase (AP) and parathyroid hormone (PTH) were assessed 24 h after birth and before discharge. The total daily intake of vitD was calculated in each infant.

Results

Sixty-two infants were enrolled, 49 with BW < 2 kg. After birth, only 24% had sufficient levels of 25(OH)D, whereas before discharge 45 of 54 infants (83%) available for analysis reached sufficient levels of 25(OH)D. All 54 infants demonstrated significant elevation in serum levels of calcium, phosphorous, AP and significant reduction in PTH levels. The total daily intake of VitD was lower than recommended (800–1000 IU/d) in 16 of 45 infants with BW < 2 kg (36%) and in all nine infants with BW>2 kg. Nevertheless, only 2 of 25 infants with insufficient intake of VitD demonstrated insufficient levels of serum 25(OH)D. No case of vitamin D excess was recorded.

Conclusions

Increased supplementation of VitD (600 IU/d) for premature newborns with BW < 2 kg is effective in increasing both total daily intake of VitD and serum levels of 25(OH)D.


Corresponding author: Amnon Zung M.D., Department of Pediatrics, Kaplan Medical Center, P.O. Box 1, Rehovot and The Hebrew University of Jerusalem, Rehovot, Israel. Phone: +972 8 9441279, Fax: +972 8 9411942, E-mail:

Acknowledgments

This study was made possible thanks to the staff in the Neonatal Intensive Care Unit at Kaplan Medical Center, Rehovot, Israel. The authors specially thank the patients and their parents.

  1. Research funding: None declared.

  2. Author contributions: A.Z. reviewed and analyzed the data and wrote the manuscript. C.T-O recruited the participants, collected blood samples, and reviewed the medical records of the patients. E.S.S. contributed to the study design and the statistical analysis, and edited the manuscript. L.H. performed the nutritional analysis of the diet of the participants. A.J-R reviewed the medical records and collected data of the newborns. O.F-R designed the study, recruited the participants, and edited the manuscript. All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  3. Competing interests: The funding organization(s) played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.

  4. Ethical statements: The study was approved by the ethics committee of Kaplan Medical Center and informed consent was obtained from the parents of the participating newborns.

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Received: 2019-11-30
Accepted: 2020-07-24
Published Online: 2020-08-31

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