双胎妊娠具有较高的围产儿发病率和死亡率，文献报道双胎妊娠的发生比例为１／８９，因种族及地区的不同略有差异［１］。由于近年不孕症促排卵药物的应用，双胎妊娠的发生率有增加趋势。研究表明，双胎妊娠胎儿脐血流波形与围产儿预后关系密切［２，３］。本研究应用脉冲... Twin pregnancies have a high perinatal morbidity and mortality, the incidence of twin pregnancies reported in the literature as 1/89, due to differences in race and region slightly [1]. As a result of infertility ovulation drugs in recent years, the incidence of twin pregnancies have increased. Studies have shown that fetal umbilical cord blood flow waveform and fetal prognosis are closely related [2,3]. This research uses pulse ...