title: Transvaginal color Doppler assessment of the uteroplacental circulation in early pregnancy.
abstract: Transvaginal color Doppler was used to investigate the uteroplacental circulation of 45 patients with normal intrauterine pregnancies at 4-18 weeks' gestation. The main uterine artery and the radial and spiral arteries were demonstrated, and characteristic flow velocity waveforms were obtained in more than 90% of cases. The indices of impedance to flow decreased with gestation and there was a progressive fall in these indices from the uterine artery, through the radial, to the spiral artery. Blood velocity in the uterine artery increased exponentially with gestation.
authors.affiliation: Ultrasonic Institute, Medical Faculty, University of Zagreb, Yugoslavia.
authors.forename: D
authors.initials: D
authors.lastname: Jurkovic
authors.forename: E
authors.initials: E
authors.lastname: Jauniaux
authors.forename: A
authors.initials: A
authors.lastname: Kurjak
authors.forename: J
authors.initials: J
authors.lastname: Hustin
authors.forename: S
authors.initials: S
authors.lastname: Campbell
authors.forename: K H
authors.initials: KH
authors.lastname: Nicolaides
mesh_terms: D000328:Adult; D001158:Arteries; D001783:Blood Flow Velocity; D005260:Female; D006801:Humans; D010920:Placenta / Q000098:blood supply* / Q000000981:diagnostic imaging*; D011247:Pregnancy / Q000502:physiology*; D011261:Pregnancy Trimester, First; D011262:Pregnancy Trimester, Second; D012039:Regional Blood Flow; D016216:Ultrasonography, Prenatal / Q000379:methods*; D014599:Uterus / Q000098:blood supply* / Q000000981:diagnostic imaging*