绒毛膜穿刺术
绒毛穿刺（CVS）又称绒毛膜穿刺术
试着标注1-4的名称
试着标注1-4的名称- 手术时间：一般在孕11-14周。思考：过早或过晚会有哪些隐患？
- 适用对象：生产过患有遗传病孩子的孕妇、夫妇一方是染色体异常者或平衡异位的携带者、曾生育过神经管缺陷儿或甲胎蛋白值高、唐氏综合征筛查存在高风险的孕妇、地中海贫血携带者、超声显示胎儿结构异常、高龄孕妇、家族遗传病、性别确定等
- 穿刺方法：
- 在可视化超声扫描引导下
- 用穿刺针经孕妇经腹壁或阴道后穹隆穿刺吸取少量丛密绒毛膜组织进行染色体、基因、生化等检查
- 经阴道后穹窿穿刺：孕妇取膀胱截石位，常规消毒外阴阴道后，将穿持针经阴道送达胎盘绒毛部分，然后吸取少量的绒毛进行送检。
- 经腹部穿刺：孕妇平躺，穿刺针经腹壁进入胎盘绒毛部分，吸取少量绒毛送检。
- 作用：产前诊断，确诊胎儿是否有染色体异常、神经管缺陷以及某些能在羊水中反映出来的遗传性代谢疾病。
- 准确性：高达99%
- 并发症：流产、畸胎风险高于羊水穿刺
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