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胎儿和新生儿铁的赋有量与体重呈正相关,随着胎龄的增加和胎儿体重的增长,胎儿自母体摄取的铁量也会加速和增多。妊娠初期,铁进入胎儿体内较少,约0.8mg/天,妊娠中期约为4mg/天,妊娠后期约为6mg/天,到足月产时铁累积量约300mg,一般按每公斤体重含铁78mg计算(成人则为50mg/kg)。其中3/4的铁分布于血红蛋白内,1/4的铁储存于组织内,主要是肝、脾内。因此,出生时赋有的铁量有赖于红细胞的总容积和血红蛋白的浓度,红细胞的总容积必然有赖于血容量,血容量则取决于出生时的体重、脐带结扎的早晚和结扎方法,
Fetal and neonatal iron endowment and weight was positively correlated with the increase of gestational age and fetal weight gain, fetal fetus from the iron intake will accelerate and increase. Early pregnancy, iron into the fetus less, about 0.8mg / day, the second trimester of pregnancy is about 4mg / day, about 6mg / day during pregnancy, to the full-term iron accumulation of about 300mg, generally per kilogram of body weight iron 78 mg (50 mg / kg in adults). Of which 3/4 of the iron distribution in hemoglobin, 1/4 of the iron stored in the organization, mainly in the liver and spleen. Therefore, the amount of iron given at birth depends on the total volume of red blood cells and hemoglobin concentration, the total volume of red blood cells necessarily depends on blood volume, blood volume depends on the birth weight, umbilical cord ligation and ligation methods,