Premium
FETAL BLOOD VELOCITY WAVEFORMS IN NORMAL PREGNANCY
Author(s) -
Stuart B.,
Drumm J.,
FitzGerald D. E.,
Duignan N. M.
Publication year - 1980
Publication title -
bjog: an international journal of obstetrics and gynaecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.157
H-Index - 164
eISSN - 1471-0528
pISSN - 1470-0328
DOI - 10.1111/j.1471-0528.1980.tb04613.x
Subject(s) - blood flow , fetus , placenta , pregnancy , medicine , vascular resistance , waveform , ultrasound , obstetrics , doppler ultrasound , gestational age , doppler effect , placental circulation , cardiology , hemodynamics , biology , physics , radiology , genetics , quantum mechanics , voltage , astronomy
Summary A combination of pulsed echo and continuous wave Doppler ultrasound was used to obtain blood flow velocity signals from the umbilical arteries of 18 normal patients from the 16th until the 40th week of pregnancy. Audio frequency analysis of these signals yielded fetal blood velocity waveforms. Analysis of these waveforms demonstrated that the placenta is an organ of low vascular resistance and that placental resistance to blood flow declines with advancing gestational age in normal pregnancy.