Effect of fortifiers and additional protein on the osmolarity of human milk: is it still safe for the premature infant?

Abstract:

OBJECTIVES:The present guidelines of the American Academy of Pediatrics recommend that osmolarity not exceed 450 mOsm/kg (or approximately an osmolarity of 400 mOsm/L) for breast milk or infant formulae, to minimize the risk factors for necrotizing enterocolitis. A commercial protein supplement has been developed to meet special protein requirements (4.0-4.5 g · kg(-1) · day(-1)) of infants with a birth weight <1000 g. Because its effect on osmolarity has not been systematically studied, we characterized the effects of fortification on the osmolarity of human milk (HM). METHODS:Osmolarity of fresh and processed HM was measured at baseline, after fortification with a commercial HM fortifier and after further supplementation with additional protein increasing in 0.5-g steps up to 4.0 g. Measurements were performed immediately after adding fortifier and/or protein and after 24 hours. In addition, changes in osmolarity were determined after adding therapeutic additives such as iron, multivitamin supplement, and calcium-phosphorus capsules. RESULTS:Native HM samples (n = 84) had 297 mOsm/L, (median; 95% confidence interval 295-299 mOsm/L). Adding HM fortifier increased osmolarity up to 436 mOsm/L (95% confidence interval 431-441 mOsm/L). Additional protein supplementation increased osmolarity by 23.5 mOsm/L per 0.5-g step, up to a maximum of 605 mOsm/L. Pasteurization decreased osmolarity by 20-30 mOsm/L (P < 0.001), and storage for 24 hours slightly increased osmolarity (by 11.5 mOsm/L P = 0.0002). Therapeutic additives increased osmolarity up to 868 mOsm/L. CONCLUSIONS:Adding HM fortifier and additional protein to HM increased osmolarity to >400 mOsm/L and therefore above the recommended threshold. Because of the excessive increase in osmolarity combinations of HM + fortifier and additional protein should not be applied together with multivitamins or other additives.

authors

Kreissl A,Zwiauer V,Repa A,Binder C,Haninger N,Jilma B,Berger A,Haiden N

doi

10.1097/MPG.0b013e3182a208c7

subject

Has Abstract

pub_date

2013-10-01 00:00:00

pages

432-7

issue

4

eissn

0277-2116

issn

1536-4801

journal_volume

57

pub_type

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