Prediction of pregnancy complications by second-trimester uterine artery Doppler assessment in monochorionic twins.

Purpose: We aimed to investigate whether transabdominal uterine artery (UtA) pulsatility index (PI) differs between monochorionic (MC) diamniotic and dichorionic (DC) twins and is useful to predict pregnancy complications.

Methods: A total of 406 uncomplicated twin pregnancies (94 MC, 312 DC) were examined at 22 -24 weeks and compared for demographic characteristics, mean UtA PI, presence of notch, development of preeclampsia, fetal growth restriction (FGR), placental abruption, intrauterine fetal death and preterm delivery. Mann-Whitney and Fisher's exact tests were performed for continuous and categorical variables, respectively.