Does the umbilical artery systolic/diastolic ratio reflect flow or acidosis? An umbilical artery Doppler study of fetal sheep
Copel J, Schlafer D, Wentworth R, Belanger K, Kreitzer L, Hobbins J, Nathanielsz P. Does the umbilical artery systolic/diastolic ratio reflect flow or acidosis? An umbilical artery Doppler study of fetal sheep. American Journal Of Obstetrics And Gynecology 1990, 163: 751-756. PMID: 2206067, DOI: 10.1016/0002-9378(90)91062-h.Peer-Reviewed Original ResearchConceptsSystolic/diastolic ratioUmbilical artery systolic/diastolic ratioDiastolic ratioFetal sheepNormal systolic/diastolic ratioUmbilical artery Doppler studiesArterial blood gas levelsBlood gas levelsAcid-base statusArtery embolizationFetal oxygenationPlacental perfusionMaternal anesthesiaPlacental embolizationAcute modelDoppler studiesThird injectionUmbilical flowFourth injectionSubsequent embolizationDays gestationFirst injectionSecond injectionEmbolizationGreater magnitude change