机构地区:[1]重庆医科大学附属成都市妇女儿童中心医院儿童保健指导中心,610091 [2]四川大学华西第二医院教育部妇儿疾病与出生缺陷重点实验室
出 处:《中华预防医学杂志》2014年第1期18-22,共5页Chinese Journal of Preventive Medicine
基 金:瑞士SIGHT AND LIFE国际维生素A研究基金(20090221)
摘 要:目的 了解维生素A(vitamin A,VA)和铁剂的单独及联合补充对铁代谢稳态指标的影响.方法 采用整群抽样的方法于2011年3-9月以成都郫县地区8所幼儿园中所有3~6岁儿童作为研究对象,共445名,利用随机数字表法将其分入单独VA补充组(一次性口服VA 20万单位,VA组),单独铁剂补充组(口服补充元素铁,剂量为每天1~2 mg/kg,每周5d,时间为6个月,FE组),VA及铁剂联合补充组(VA及铁剂联合补充,VF组)、对照组(不进行VA和铁剂的补充,CO组).补充前后分别采集调查对象静脉血3 ml,检测其血红蛋白(Hb)、VA、血清铁蛋白(serumferritin,SF)、血清可溶性转铁蛋白受体(serum transferring receptor,sTfR)、C-反应蛋白(C-reactiveprotein,CRP);同时计算转铁蛋白受体-铁蛋白指数(transferring receptor-ferritin index,TFR-F)以及机体总铁含量(total body iron content,TBIC).分析干预前后不同组间各项指标的差异.结果 VA组干预前sTfR水平为(1.78 ±0.17) mg/L,高于干预后[(1.18 ±0.11)mg/L](£=28.88,P<0.01);干预前FE组和VF组TFR-F指数分别为1.59±0.37、1.63±0.40,TBIC分别为(9.04±2.71)、(9.26±2.33) mg/kg,均低于干预后[FE、VF组TFR-F指数分别为1.84 ±0.51、1.87 ±0.45,TBIC分别为(12.42±3.49)、(13.01±2.98) mg/kg](t值分别为3.93、3.78、7.57、9.41,P值均<0.01);干预前VA组、FE组、VF组铁缺乏症的发病率分别为26% (25/95)、31% (30/98)、31% (28/90),干预后分别为41% (39/95)、10%(10/98)、18%(16/90),差异均有统计学意义(x2值分别为4.59、12.50、4.31,P值均<0.05).结论 单独补充VA和铁及两者联合补充对改善铁缺乏症效果相同,VA对机体铁代谢稳态的影响主要表现在促进储备铁的动员和利用,而对机体总体含量并无影响.Objective To explore the effect of vitamin A(VA) combined iron supplements on iron metabolic homeostasis for preschoolers.Methods About 445 preschoolers with aged 3-6 years old from eight kindergartens in Pixian county,Chengdu were recruited into this trial from March to September,2011.All subjects met the inclusion criteria were randomly divided into four groups using random number table:sole VA supplementation group (VA group,a single oral dose of VA at about 200 000 units),sole iron supplementation group (FE group,daily oral supplementation with the element iron 1-2 mg · kg-1 · d-1 for five days a week,lasting for 6 months),the combined supplementation of VA and iron group (VF group) and control group (CO group,no VA and iron supplementation).The concentration of serum VA,serum ferritin (SF),serum transferring receptor (sTfR),C-reactive protein (CRP) and hemoglobin (Hb) were measured from 3 ml vein blood.The sTfR-SF index (TFR-F index) and total body iron content (TBIC) before and after intervention were calculated.The differences of these indexes between groups before and after intervention were analyzed.Results The level of sTfR before intervention in VA group ((1.78 ± 0.17) mg/L) was significantly higher than that of after intervention ((1.18 ± 0.11) mg/L) (t =28.88,P <0.01).The levels of TFR-F index and TBIC in FE and VF groups before intervention ((1.59 ±0.37),(1.63 ±0.40) and (9.04 ±2.71),(9.26 ±2.33) mg/kg,respectively) were all lower than those of after intervention (TFR-F index:(1.84 ± 0.51),(1.87 ± 0.45) and TBIC:(12.42 ± 3.49),(13.01 ± 2.98) mg/kg) (t values were 3.93,3.78,7.57 and 9.41,respectively,all P values were < 0.01).The incidence of iron deficiency in VA,FE,and VF groups before intervention were 26% (25/95),31% (30/98) and 31% (28/90)and were 41% (39/95),10% (10/98)and 18% (16/90)for after intervention,respectively.The differen
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