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PEDIATRICS Vol. 106 No. 3 September 2000, pp. 581-588

Enhanced Growth of Preterm Infants Fed a New Powdered Human Milk Fortifier: A Randomized, Controlled Trial

Received Nov 15, 1999; accepted Apr 20, 2000.

Bridget Barrett Reis*, Robert T. HallDagger , Richard J. Schanler§, Carol L. Berseth§, Gary Chanparallel , Judith A. Ernst, James Lemons, David Adamkin#, Geraldine Baggs*, and Deborah O'Connor*

From the * Medical and Regulatory Affairs, Ross Products Division, Abbott Laboratories, Columbus, Ohio; Dagger  Children's Mercy Hospital, Kansas City, Missouri; § Baylor College of Medicine, Houston, Texas; parallel  University of Utah, Salt Lake City, Utah;  Indiana University School of Medicine, Indianapolis, Indiana; and # University of Louisville, Louisville, Kentucky.

Objective.  A prospective, double-blind, randomized, controlled trial was conducted to evaluate the growth and nutritional status of preterm infants receiving preterm human milk supplemented with a newly formulated powdered human milk fortifier (HMF), study fortifier (SF), or a powdered commercial HMF (CF).

Methods.  Infants (n = 144) with a birth weight <= 1600 g and gestational age at birth of <= 33 weeks were enrolled and randomized before 21 days of life. Study day (SDAY) 1 was defined as the day full-strength fortification (4 packets/100 mL) began and the infant reached an intake of at least 100 mL/kg/day. Growth, biochemical indices of nutritional status, enteral intake, feeding tolerance, clinical histories, and morbidity were assessed serially. The primary outcome variable was weight gain (g/kg/day) from SDAYs 1 to 29 or hospital discharge, whichever came first.

Results.  Infants fed human milk supplemented with SF consistently grew more rapidly from SDAYs 1 to 29 (or hospital discharge), regardless of whether the statistical analyses were performed on all subjects who were randomized into the study and reached SDAY 1 (intent-to-treat) or were limited to those able to adhere strictly to the feeding protocol of the study (subgroup). Using mean values adjusted for study site (least square [LS] means), the weight gain differences were 2.6 and 3.8 g/kg/day for the intent-to-treat and subgroup analyses, respectively. Likewise, the length-gain differences were .14 and .18 cm/week for the intent-to-treat and subgroup analyses, respectively. Infants in the SF group reached a weight of 1800 g at SDAY 18, and those in the CF group at SDAY 25. Mean alkaline phosphatase values among infants in the SF group were higher than for the CF infants (eg, LS means: 327 U/L vs 272 U/L, intent-to-treat analysis), likely reflecting the more rapid linear growth of the SF infants. Mean serum calcium values tended to be lower in the SF group in the intent-to-treat analysis and were significantly lower in the subgroup analysis (LS means: 10.3 mg/dL vs 11.2 mg/dL). Both fortifiers were generally well-tolerated, although an increased number of infants in the CF group exited the feeding protocol because of gastric residuals and abdominal distention.

Conclusion.  A new powdered HMF was shown to enhance the growth of preterm infants, compared with a commercially available powdered HMF in the United States.  Key words:  human milk, human milk fortifier, growth, preterm infants, low birth weight.




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