title: Influence of parity on second-trimester uterine artery Doppler waveforms in twin pregnancy.
abstract: We performed uterine artery Doppler velocimetry in 16 nulliparous and 16 parous women with non-preeclamptic singleton gestations and 16 nulliparous and 16 parous women with dichorionic twin gestations at 17-18 and 26-27 weeks of gestation. In both singleton and twin pregnancies, the average pulsatility index (PI) in nulliparous women was significantly higher than that in parous women at 17-18 weeks of gestation. At 26-27 weeks of gestation, however, there were no significant differences in PI between nulliparous and parous women with either singleton or twin pregnancies. During the early second-trimester of non-preeclamptic singleton and twin pregnancies, parity has a significant effect on uterine artery blood flow.
authors.affiliation: Department of Obstetrics and Gynecology, Tokyo Rinkai Hospital, Japan. czg83542@mopera.ne.jp
authors.forename: Shunji
authors.initials: S
authors.lastname: Suzuki
mesh_terms: D001158:Arteries / Q000502:physiology*; D005260:Female; D005865:Gestational Age; D006801:Humans; D010298:Parity / Q000502:physiology*; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D011272:Pregnancy, Multiple / Q000502:physiology; D014427:Twins; D018608:Ultrasonography, Doppler / Q000379:methods*; D014599:Uterus / Q000098:blood supply*