摘要
<正>先天性心脏病(CHD)发病率占婴儿出生率的1%左右,这种先天缺陷可以导致一些婴儿死亡,也是婴幼儿出生后就医的常见原因~([1])。目前普遍观点认为,CHD的发生大多是遗传因素和环境因素相互作用的结果,甚至和胚胎或发育时期所承担的压力和焦虑有关~([2])。最近几年的一些流行病学研究表明,在妊娠前期摄取叶酸起着非常重要的作用,是可以干预CHD发生的重要因素~([3])。叶酸的作用之一是参与
引文
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