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Uteroplacental Doppler flow velocity waveforms in the second trimester. A complex circulation
Author(s) -
BEWLEY S.,
CAMPBELL S.,
COOPER D.
Publication year - 1989
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.1471-0528.1989.tb03378.x
Subject(s) - gestation , doppler ultrasound , doppler effect , circulation (fluid dynamics) , ultrasound , medicine , pregnancy , fetal circulation , placenta , obstetrics , fetus , biology , physics , radiology , mechanics , genetics , astronomy
Summary. Continuous wave Doppler ultrasound was used to examine the Uteroplacental circulation of an unselected group of 993 women between 16 and 24 weeks gestation. Reference ranges for resistance index (RI) were determined and throughout this gestation range there was a significant fall in RI with increasing gestation. The RI was lower from placental than non‐placental sites and from distal ‘arcuate’ than proximal ‘uterine’ sites. There is a need to define fixed standardized sites for sampling and for normal ranges to account for variables such as placental site.