title: Continuous determination of umbilical artery flow parameters during fetal bradycardia using computerized analysis of Doppler wave forms.
abstract: Umbilical artery flow curves were obtained by Doppler ultrasonography before, during, and after episodes of fetal bradycardia in the active stage of labor in 6 women. Between 126 and 1,607 Doppler wave forms were analyzed for each patient. During the periods of bradycardia all the umbilical artery resistance flow parameters increased (p < 0.00001). The increase in resistance did not precede the change in heart rate. This study presents an accurate and reproducible method for continuous evaluation of the changes in the impedance of fetal blood flow during fetal heart rate changes, thereby enabling detailed assessment of circulatory disturbances occurring during labor and delivery.
authors.affiliation: Department of Gynecology, Shaare Zedek Medical Center, Jerusalem College of Technology, Israel.
authors.forename: O
authors.initials: O
authors.lastname: Tadmor
authors.forename: M
authors.initials: M
authors.lastname: Nitzan
authors.forename: R
authors.initials: R
authors.lastname: Rabinowitz
authors.forename: A
authors.initials: A
authors.lastname: Chizhevsky
authors.forename: Y
authors.initials: Y
authors.lastname: Skomorovsky
authors.forename: Y
authors.initials: Y
authors.lastname: Aboulafia
authors.forename: E
authors.initials: E
authors.lastname: Anteby
authors.forename: Y Z
authors.initials: YZ
authors.lastname: Diamant
authors.forename: S
authors.initials: S
authors.lastname: Yagel
mesh_terms: D001783:Blood Flow Velocity; D001919:Bradycardia / Q000000981:diagnostic imaging / Q000196:embryology* / Q000503:physiopathology; D003201:Computers; D036861:Delivery, Obstetric; D005260:Female; D005315:Fetal Diseases / Q000000981:diagnostic imaging* / Q000503:physiopathology; D006340:Heart Rate, Fetal; D006801:Humans; D007743:Labor, Obstetric; D011247:Pregnancy; D014463:Ultrasonography; D014469:Umbilical Arteries / Q000000981:diagnostic imaging* / Q000503:physiopathology