Читать книгу Protocols for High-Risk Pregnancies - Группа авторов - Страница 88

In pregnancies complicated with suspected intrauterine growth restriction in the third trimester, umbilical artery Doppler velocimetry has been used either as an adjunct to or in lieu of fetal heart rate testing. Doppler ultrasound testing is a noninvasive procedure which is used to assess the presence and severity of resistance within the umbilical artery. This resistance is typically reduced, absent or reversed during diastole in growth‐restricted fetuses in comparison to equal gestational age but normally growing fetuses. This end‐diastolic flow is considered abnormal when it is either absent or reversed. The use of antepartum umbilical artery Doppler velocimetry has been shown to be of value but is limited to the management of pregnancies complicated with intrauterine growth restriction.