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Resumen: Introducción: Los beneficios de la leche donada frente a la fórmula artificial están demostrados, sin embargo no se conoce la influencia de la apertura de un banco de leche en la práctica clínica habitual. El objetivo de este estudio fue medir el impacto en la práctica clínica de la disponibilidad de leche donada para la nutrición de los prematuros ≤ 32 semanas de edad gestacional. Métodos: Estudio antes-después de la apertura de un banco de leche. Se incluyeron los ≤ 32 semanas nacidos en el Hospital 12 de Octubre de julio-diciembre de 2005 y de enero-junio de 2008 (6 primeros meses tras la apertura del banco de leche). Resultados: La apertura del banco de leche permitió empezar 31 h antes (p

The benefits of donor human milk compared with artificial formulas have been well demonstrated; nevertheless the impact in the clinical practice of opening a human milk bank within a neonatal unit has not yet been studied. The main aim of this study was to analyze the impact on the clinical practice of opening a human milk bank in a neonatal unit to provide donor human milk for preterm infants ≤ 32 weeks of gestational age.A before and after study was designed, with the intervention being the opening a human milk bank. Preterm infants ≤ 32 weeks of gestational age born in the Hospital 12 Octubre from July to December 2005 and January to June 2008 (firsts 6 months after opening the human milk bank) were included.After opening the human milk bank, enteral feedings were started 31h before (P.001), 100ml/kg/day were achieved 59.5h before (P.001) and 150 ml/kg/day 52 h before (P=.002). Enteral feedings were never started LM with artificial formula, the exposure to formula in the first 15 days of life was reduced from 50% to 16.6%, and it's consumption during the first 28 days of life was significantly reduced. There was a higher consumption of own mother's milk during the hospital stay, and a higher rate of exclusive breastfeeding at hospital discharge (54% vs 40%).The availability of donor human milk has led to quicker progression with enteral feedings and earlier withdrawal of parenteral nutrition. It has reduced the exposure to artificial formulas, and has also increased the intake of own mother's milk during the hospital stay and the rate of exclusive breastfeeding at hospital discharge.