Definition
Post-procedural complication included the things happened within two weeks following the procedure: intrauterine fetal death( IUFD) of the co-twin, miscarriage, pregnancies were terminated due to abnormal ultrasound findings such as hydrops of the co-twin.
Adverse perinatal outcome included any of the following: IUFD or miscarriage after two weeks following the procedure, termination of the pregnancy and preterm delivery before 28 weeks of gestation.
sIUGR was defined as an estimated fetal weight < 10th percentile in one twin and estimated fetal weight discordance ≧25%. Cases were classified into one of three types according to UA Doppler flow10.