In these experiments we have studied three factors that affect placental O2 transfer. The fetal artery of an isolated cotyledon of the sheep placenta (or one of the umbical arteries in flow studies in rabbits) was perfused in situ with blood of varying PO2 and at different flow rates while the ewe was administered varying inspired O2 concentrations. Measurements were made of the PO2 of inflowin...

OBJECTIVE To detect the serum levels of folate and B12 in both preclamptic and normotensive pregnant women and to determine whether there is any relation between these levels with the uterine and umbilical artery Doppler indices as well as the pregnancy outcome. MATERIAL AND METHODS This case controlled study comprised 79 pregnant patients with preeclampsia and 113 healthy, normotensive pregn...

Within a period of 6 years (1994-99) we registered 29 triplet deliveries out of a total of 13,969 hospital deliveries (0.02%). Since there is limited information about specific problems of chorionicity in triplet pregnancies, we analysed the 29 cases according to origin of pregnancy and chorionicity. We here report on two cases with a high risk according to chorionicity with dichorionic (DC) di...

Microvascular anastomosis procedure has become an essential practice for the management of most neurovascular diseases. Increasing use of neurosurgical techniques necessitates intensive laboratory training in microsurgery. Umbilical artery is used for quantifiable representation to set up microvascular anastomosis model for the beginners. These arteries are found to be between 4 and 5 mm in dia...

BACKGROUND Atherosclerosis is a chronic inflammatory response of the arterial wall to injury. Macrophage migration inhibitory factor (MIF), a cytokine with potent inflammatory functions, was thus considered to be important in atherosclerotic lesion evolution. METHODS AND RESULTS We studied the presence and distribution of MIF immunoreactivity (MIF-IR) and MIF mRNA in internal mammary arteries...

We reported a very rare case with placentomegaly and markedly-dilated chorionic vessels. A 23-year-old Japanese pregnant woman was referred to our hospital at 32 weeks of gestation because of suspected dilatation of the umbilical vein. Ultrasound revealed fetal growth restriction with no fetal anomalies. The placenta was thick. The umbilical cord had two arteries and one vein, and marginal inse...

ALTURA, BURTON M., D. MALAVIYA, CHARLES F. REICH, AND LOUIS R. ORKIN. Effects of vasoactive agents on isolated human umbilical arteries and veins. Am. J. Physiol. 222(Z): 345-355. 1972.In vitro experiments, using both helically and longitudinally cut human umbilical arteries and veins (HUAV), were designed to determine: I) whether any of the known circulating vasoactive substances can induce co...

BACKGROUND Helicobacter pylori-CagA positive strains have been shown to be associated with atherosclerosis. However, the pathogenesis is still undetermined. The aim of this study was to determine whether anti-CagA antibodies cross-react with antigens of normal and atherosclerotic arteries. METHODS AND RESULTS Eight umbilical cord sections, 14 atherosclerotic artery sections, and 10 gastrointe...

The fetal internal carotid artery and umbilical artery flow velocity time waveforms were studied in 17 consecutive twin pregnancies. The pulsatility index was calculated for each fetus in each artery as an index of vascular resistance. All studies were done within 14 days before delivery. In 8 pregnancies both fetuses were of birthweight appropriate for gestational age; whereas, in 9 patients o...

BACKGROUND/AIMS Although the interlobar arterial collateral of the liver has been thoroughly analyzed, few reports have described the intersegmental arterial collateral between the medial and left lateral segments. METHODS The hepatic arterial system of the left liver was evaluated using 12 latex resin cast specimens in which latex resin was injected into the left hepatic artery after ligatio...