Duplex Doppler ultrasonographic evaluation of the fetal renal artery in normal and abnormal fetuses

Article Abstract:

Duplex Doppler ultrasonography uses high frequency sound to monitor the flow of blood through arteries. Uneven fetal growth may be explained by decreased blood flow through one of the two fetal kidneys arteries. The flow of blood through the arteries supplying the kidneys was assessed by Doppler ultrasonography in 11 pregnancies suspected of intrauterine growth retardation (IUGR), or poor fetal growth. Normal fetuses had Doppler patterns indicating higher blood flow through the kidneys. Fetuses with IUGR had more resistance within the kidney blood vessel bed, decreasing the overall blood flow. Pregnancies complicated by IUGR commonly have a decreased amount of fluid surrounding the fetus. This can be explained by the inability of the kidney to compensate for the overall decreased blood flow. (Consumer Summary produced by Reliance Medical Information, Inc.)

Evaluation, Causes of, Vascular resistance, Growth disorders, Duplex ultrasonography

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Low target birth weight or growth retardation? Umbilical Doppler flow velocity waveforms and histometric analysis of fetoplacental vascular tree

Article Abstract:

Doppler ultrasonography of the umbilical artery may be an effective method for detecting a placental vascular lesion in small-for-gestational-age (SGA) fetuses. Thirty fetuses underwent Doppler ultrasonography of the umbilical artery and histomorphometric analysis of their placental vascular tree after delivery. Nine fetuses were small for their gestational age with abnormal umbilical artery blood flow, seven were small for their gestational age with normal umbilical artery blood flow and 14 were an appropriate size for their gestational age. A significant association was found between abnormal Doppler flow waveforms of the umbilical artery and fewer blood vessels in the placenta. An association was also found between abnormal Doppler flow waveforms and abnormal diffusion capacity in placental blood vessels.

Analysis, Placenta, Histology, Pathological, Pathological histology, Umbilical cord

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The use of power Doppler and color angiography in fetal imaging

Article Abstract:

A new color Doppler ultrasound technology may enable normal and abnormal conditions in the fetus to be imaged clearly. Researchers performed color power angiography first on fetal lungs to determine what normal lung perfusion looked like. Kidney perfusion was investigated next. Both lungs and kidneys have normal perfusion patterns; abnormal structures can be discerned by the abnormal perfusion pattern. Color power angiography enables Doppler technology to image structures with low perfusion, as seen in the fetus. Color power angiography may be used in the future to examine the placenta.

Angiography

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