[Measuring fetal ischemia using multichannel pulsed Doppler sonography of the aorta and umbilical vein. Preliminary results in normal pregnancy].
The recent development of ultrasound techniques linked to a continuous or pulsed Doppler system allows an immediate and atraumatic study of fetal blood flow to be performed. Using pulsed Doppler techniques, blood velocity waves can be analyzed and blood flow can then be calculated using ultrasound to determine the diameter of the fetal vessel; the result is expressed in milliliters per minute. A study of aortic and umbilical venous blood flow has been carried out with a prototype pulsed Doppler system with 128 gates. The same probe was used to obtain pictures by B mode ultrasound as well as to generate Doppler waves. The study group consisted of 90 normal pregnancies between 32 and 41 weeks of gestation. The umbilical venous blood flow has been measured in 50 subjects and the aortic blood flow in 79 subjects. The average aortic blood flow varied from 345 to 618 ml/min. In the umbilical vein, the flow was between 240 and 420 ml/min. It was noticed that as pregnancy advanced, blood flow slightly increased. The paper discusses the results obtained and the problems encountered with this method.
Gasser
B
B
Ditesheim
P J
PJ
Willemetz
J C
JC
D001012:Aorta, Abdominal; D001783:Blood Flow Velocity; D005260:Female; D005865:Gestational Age; D006801:Humans; D008431:Maternal-Fetal Exchange; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000295:instrumentation*; D012016:Reference Values; D014463:Ultrasonography / Q000295:instrumentation*; D014471:Umbilical Veins
Débimétrie foetale au moyen d'un Doppler pulsé multicanaux dans l'aorte et la veine ombilicale. Résultats préliminaires dans la grossesse normale.