Postnatal growth of the very low birth weight infantTo establish a postnatal growth chart for very low birth weight (VLBW) infants, data obtained from 1 26 breast milk fed VLBW patients in actual follow up was studied. For the analysis of results infants were divided in three groups accordingly to birth weight (BW): A (BW 650 to 1000 g); B (BW 1001 to 1200 g) and C (BW 1201 to 1500 g). Ciroup A babies lost weight till day 9 of life, group B and C did it only till day 7. Losses amounted to 15.7, 13,3 and 12.3% of BW respectively. BW was again attained at 25, 21 and 20 days in the corresponding groups. In al! groups BW was doubled at 70 days of age and tripled at age 100 days. Length increased by 0.66,. 0.65 and 0.63 cm and head circunferenee by 0.65, 0.51 and 0.48 cm in groups A, B and C in the first eight weeks of life respectively. Although initial increases in weight, body length and head circunferenee were similar to figures from other experiencies. weight increase after the first two weeks was considered insufficient in these breast milk fed infants, suggesting the need to further evaluate fortified breast milk or hipercaloric artificial formulae for them. (Key words: Very low birth weight, post natal growth, weight, length, head circunference).El mcjor cuidado perinatal e intensive del prematuro ha aumentado considerablemente el porcentajc de sobrevida de los recien nacidos de nmy bajo peso (RNMBP) por lo que adquiere cada ve/ mas importancia la necesidad de establecer patrones de crecimiento postnatal que sirvan para futuras comparaclones y que ademas, permiian una ealificacion mas acertada del estado nutritivo del nino diminulo a determinada edad.Durante el ultimo tiempo se ha recomendado algunas curvas de crecimiento post-concepcional de los ninos dc bajo peso 1 " 3 pero las causuisticas son aun muy pcquenas, sobre todo en los de peso inferior a 1000 g, como para sacar conclusiones definitivas. Por otro lado, la edad gestacional calculada scgun fecha de la ultima menstruacion esta sujeta a dcmasiados errores como para podcr aplicarla en la practica diaria. lil objeto de esta comunioicion es dar a conocer aigunos indicadores antropometricos que 1. Departamcnto de pediatn'a, Hospital Roberto del Rio, Santiago, Chile. 2. Internes de la Carrera dc Medicina. Universidad de Chile.sirvan como guia para la ealificacion del crecimiento del RNMBP en las primeras semanas de vida extrauterina. En otra oportunidad se daran a conocer los resultados a tres afios plazo. MATERIAL V METODOSSe estudiaron en forma prospcctiva 126 recien nacidos de 680 a 1500 g que egresaron de la unidad de nconatologfa del Hospital Roberto del Rio, entre 1983 y 1987. Este centro atiende una poblacion urbana de eseasos recursos y los niiios nacen en una maternidad estatal no anexa al Hospital Pediatrico.En el estudio se incluyeion solo recien nacidos con peso adecuado para la edad gestacional tomando como modelo las curvas de Lubchenco y eolaboradores. 4 La edad gestacional, salvo en unos pocos casos en que habi'a diagnostico ecografico preco...
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