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Uterine artery flow velocity waveforms were measured by continuous-wave Doppler ultrasound in 15 normal pregnant women studied from midgestation until term. Results were analyzed by calculation of the pulsatility index and the systolic/diastolic blood velocity [corrected] ratio. Both indices decreased from 16 to 20 weeks (indicating a lowering of resistance) and thereafter remained stable until term. Resistance was lower when waveforms were recorded directly over the placenta or from the uterine artery close to the placenta. A group of women with severe intrauterine growth retardation were also studied. In preeclampsia, uterine artery resistance was increased in almost all patients. In pregnancies complicated by intrauterine growth retardation of non preeclamptic origin, a wide range of results was obtained.
L M McCowan, and
K Ritchie, and
L Y Mo, and
P A Bascom, and
H Sherret
May 1987,
Obstetrics and gynecology,
L M McCowan, and
K Ritchie, and
L Y Mo, and
P A Bascom, and
H Sherret
August 1990,
British journal of obstetrics and gynaecology,
L M McCowan, and
K Ritchie, and
L Y Mo, and
P A Bascom, and
H Sherret
January 1994,
Annales chirurgiae et gynaecologiae. Supplementum,
L M McCowan, and
K Ritchie, and
L Y Mo, and
P A Bascom, and
H Sherret
June 1986,
Obstetrics and gynecology,
L M McCowan, and
K Ritchie, and
L Y Mo, and
P A Bascom, and
H Sherret
December 1993,
Obstetrics and gynecology,
L M McCowan, and
K Ritchie, and
L Y Mo, and
P A Bascom, and
H Sherret
April 1993,
Obstetrics and gynecology,
L M McCowan, and
K Ritchie, and
L Y Mo, and
P A Bascom, and
H Sherret
January 1992,
Journal of perinatal medicine,
L M McCowan, and
K Ritchie, and
L Y Mo, and
P A Bascom, and
H Sherret
December 2003,
Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology,
L M McCowan, and
K Ritchie, and
L Y Mo, and
P A Bascom, and
H Sherret
March 1993,
Asia-Oceania journal of obstetrics and gynaecology,
L M McCowan, and
K Ritchie, and
L Y Mo, and
P A Bascom, and
H Sherret
June 1990,
Chinese medical journal,
