目的 探讨与先天性心脏病（CHD）发生有关的危险因素。
Objective To investigate the environmental risk factors associated with the development of congenital heart diseases (CHD).
NT增厚除了与染色体病密切相关外，还与先天性心脏病、胎儿畸形、贫血、感染等因素相关。
NT thickening is related to chromosomal syndromes closely, still to congenital heart disease, fetal abnormalities, anemia, infection factors.
某些迟发性紫绀的先天性心脏病与艾森·门格综合征较难鉴别，诊断务必谨慎。
Tardive cyanosis caused by some congenital heart diseases must be carefully diagnosed for the similarity to that of Eisenmenger syndrome.
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