ttts

Conclusions ( 1 ) TTTS have severe harmful effects on the fetus .

结论（1）双胎输血综合征严重影响胎儿预后；

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 PIs and peak systolic velocity of the peripheral artery descending aorta , ductus arteriosus and middle cerebral artery were decreased in TTTS group ( p < 0 01 ) .

外周动脉－降主动脉（DAO）及大脑中动脉（MCA）PI值和峰值（Vm）降低（P＜0.01）；

There were six monozygotic twins , the other seven were dizygotic twins . Among the total cases , there were four twin to twin transfusion syndromes ( TTTS ) .

单卵双胎6例，双卵双胎7例，胎儿死因中双胎输血综合征（TTTS）4例。

The ratio of conception by assisted reproductive techniques in TTTS group was lower ( 11.1 % vs 40.0 % , P < 0.05 ), and the incidence of placenta abruption was higher than that of the control group ( 22.2 % vs 1.3 % , P < 0.01 ) .

TTTS组辅助生育受孕明显低于非TTTS组（11.1%比40.0%，P<0.05），胎盘早剥发生率明显高于非TTTS组（22.2%比1.3%，P<0.05）；