Doppler flow velocity waveforms of the umbilical arteries correlate with intravillous blood volume

Article Abstract:

Reduced blood flow in the capillaries of the placenta can be detected by Doppler ultrasound. A physician measured the size of the capillaries in 160 placentas collected after birth and compared the results with Doppler ultrasound scans taken before birth. Resistance to blood flow at the capillary level was associated with reduced or absent blood flow in the umbilical arteries seen in the ultrasound scan. Less than 85 milliliters of blood in the capillaries was associated with a high risk of small-for-gestational age infants and fetal distress.

Blood flow, Measurement, Blood flow measurement

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Regulation of human placental chloride channel by arachidonic acid and other cis unsaturated fatty acids

Article Abstract:

There appears to be a high-volume, or maxi, chloride channel in the human placenta that is inhibited by arachidonic acid and other unsaturated fatty acids. This was the conclusion of researchers who used the patch-clamp method to study the electrophysiology of apical membrane chloride channels from samples of human placentas. Arachidonic acid, oleic acid and linoleic acid all inhibited chloride transport through the channel. This channel might regulate the transportation of chloride across the placenta.

Arachidonic acid, Chloride channels

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Absence of flow velocity waveform changes in uterine arteries after bilateral internal iliac artery ligation

Article Abstract:

Surgically closing the iliac arteries can stop severe hemorrhage after childbirth with no adverse effects on the uterus. This can preserve a woman's chance of having another pregnancy in the future.

Surgery, Uterine bleeding, Uterine hemorrhage

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