[申覆] 医学六　31 答案: B.怀孕前服用叶酸及多种维生素,怀孕後接受高层次超音波检查 这答案好像已经把etiology设定为:Folic acid deficiency 其它的etiology也包括了:Genetic factors -->那麽D也应该是答案之一 Genetic factors — A genetic factor is suggested by the observations that NTDs have a high concordance rate in monozygotic twins, are more frequent among siblings, and are more common in females compared to males [9]. In addition, there is a high prevalence of karyotypic abnormalities among fetuses with NTDs, especially in the presence of other congenital anomalies. For example, a large study evaluating the frequency of chromosomal abnormalities in pregnancies with fetal NTDs found these abnormalities in 6.5 percent of affected cases (4/167 fetuses with an isolated NTD and 9/33 fetuses with a NTD and associated anomalies) [10]. A second series reported a similar rate (7 percent) of chromosomal abnormalities in fetuses with NTDs [11]. Trisomy 18 was the most common aneuploidy in both series. These data support the use of fetal karyotyping as an aid in diagnostic evaluation and recurrence risk counseling. 资料来源: Uptodate.com - Anencephaly and encephalocele 建议B,D皆给分 覆议的请推文 谢谢 --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 111.240.232.14