Results ( 1) The overall incidence of TTTS was 2.8% in all twin pregnancies, and 8.1% in monochorionic twin pregnancies. 结果(1)双胎输血综合征占双胎妊娠总数的2.8%,占单绒毛膜双胎的8.1%;
The best cut-off for membrane thickness for discriminating monochorionic from dichorionic twinning was 1.8 mm. 区分单绒毛膜双胎与双绒毛膜双胎的分隔膜厚度最佳截断点为1.8mm。
Using this cut-off, there were two false-negative and four false-positive diagnoses of monochorionic twins with 3D ultrasound and seven false-negative and nine false-positive with 2D ultrasound. 三维超声采用这一分界标准诊断单绒毛膜双胎出现2例假阴性和4例假阳性,二维超声采用这一分界标准诊断单绒毛膜双胎出现7例假阴性和9例假阳性。