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Normal Doppler flow velocity waveforms in the fetal ductus arteriosus in the first half of pregnancy
Author(s) -
Brezinka C.,
Huisman T. W. H.,
Stijnen T.,
Wladimiroff J. W.
Publication year - 1992
Publication title -
ultrasound in obstetrics and gynecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.202
H-Index - 141
eISSN - 1469-0705
pISSN - 0960-7692
DOI - 10.1046/j.1469-0705.1992.02060397.x
Subject(s) - medicine , ductus arteriosus , gestational age , pregnancy , gestation , ultrasound , fetus , obstetrics , doppler ultrasound , blood flow , obstetrics and gynaecology , diastole , hemodynamics , doppler effect , cardiology , radiology , blood pressure , genetics , physics , astronomy , biology
Ductus arteriosus flow velocity patterns were studied in 298 women between 9 and 25 weeks of gestation using transvaginal or transabdominal Doppler ultrasound. Technically acceptable recordings were first obtained at 11 weeks resulting in 231 women for further analysis. Ductal waveforms show a significant change in shape from early pregnancy to mid‐pregnancy, in that end‐diastolic velocities are absent until 13 weeks, are present in 50% at 15 weeks and are present in all cases from 17 weeks. Regression analysis demonstrated a statistically significant linear increase with advancing gestational age for all flow velocity parameters except for the pulsatility index which remained stable during the entire study period. Copyright © 1992 International Society of Ultrasound in Obstetrics and Gynecology