Umbilical cord stricture and fetal intrauterine death

Sun, Yuntian; Arbuckle, Susan; Hocking, Glenn; Billson, Virginia

doi:10.1080/00313029400169241

Cited by 14 publications

(22 citation statements)

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“…We are not sure that the assumption of a circular cross‐section is valid for the abdominal wall section of the vein20, or whether the constriction is situated slightly more into the cord in some cases and therefore not included in the diameter measurement at the umbilical ring. Reports of umbilical cord stricture close to the abdominal insertion in some stillborns support the latter scenario31. In the latter case the velocity measurement would be the more reliable one.…”

Section: Discussionmentioning

confidence: 84%

Re‐Based Heterogeneous Catalysts for Olefin Metathesis Prepared by Surface Organometallic Chemistry: Reactivity and Selectivity

Chabanas

Copéret

Basset

2003

Chemistry A European J

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Herein we describe the catalytic activity of 1, a well-defined Re alkylidene complex supported silica, in the reaction of olefin metathesis. This system is highly active for terminal and internal olefins with initial rates up to 0.7 mol per mol Re per s. It also catalyses the self-metathesis of methyl oleate (MO) without the need of co-catalysts. The turnover numbers can reach up to 900 for MO, which is unprecedented for a heterogeneous Re-based catalyst. Moreover the use of silica as a support can bring major advantages, such as the possibility to use branched olefins like isobutene, which are usually incompatible with alumina-based supports; therefore, the formation of isoamylene from the cross-metathesis of propene and isobutene can be performed. All these results are in sharp contrast to what has been found for other silica- or alumina-supported rhenium oxide systems, which are either completely inactive (silica system) or typically need co-catalysts when functionalised olefins are used. Finally the initiation step corresponds to a cross-metathesis reaction to give a 3:1 mixture of 3,3-dimethylbutene and trans-4,4-dimethylpent-2-ene, and make this catalyst the first generation of well-defined Re-based heterogeneous catalysts.

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Section: Discussionmentioning

confidence: 84%

Re‐Based Heterogeneous Catalysts for Olefin Metathesis Prepared by Surface Organometallic Chemistry: Reactivity and Selectivity

Chabanas

Copéret

Basset

2003

Chemistry A European J

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“…Increasing clinical and experimental evidence shows that the state of the vascular system of the umbilical cord and placenta plays an important role in the intrauterine development of the fetus 14,15 . Stricture of umbilical cords, characterized by a reduced amount of Wharton's jelly and a thickening of the vascular wall, has been described in unexplained intrauterine fetal deaths 16 . Areas of degeneration of Wharton's jelly around the vessels, replaced by dense hyaline collagenous tissue, have been considered responsible for the constriction and subsequent torsion of the umbilical cord 17 .…”

Section: Discussionmentioning

confidence: 99%

“…Areas of degeneration of Wharton's jelly around the vessels, replaced by dense hyaline collagenous tissue, have been considered responsible for the constriction and subsequent torsion of the umbilical cord 17 . The included cord vessels are usually markedly compressed and constricted and occasionally show antemortem thrombosis 16 . Furthermore, Silver and colleagues 18 reported that, in prolonged pregnancies, fetuses with a small umbilical cord were more likely to experience antenatal and intrapartum cord compression.…”

Section: Discussionmentioning

confidence: 99%

Prenatal assessment of Wharton's jelly in umbilical cords with single artery

Raio

Ghezzi

Naro

et al. 1999

Ultrasound in Obstet & Gyne

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“…1 Assessment of morphometric alterations of umbilical cord by prenatal sonography at different gestational ages permits the identification of adverse perinatal outcomes. 2,3 Many authors established the morphology of umbilical cord and components but very few studies were conducted on determining the reference ranges of the cross-sectional area of the portions of the umbilical cord. [4][5][6][7] Alteration of these reference ranges validates antenatal and perinatal complications including preeclampsia, growth restriction, pregnancy induced hypertension, fetal heart rate disturbances, fetal aneuploidy, macrosomy, and intrauterine demise.…”

Section: Introductionmentioning

confidence: 99%

Antenatal sonographic assessment of cross sectional area of umbilical cord components and its reference value in normal pregnancy

Afroze

Subash

Anand

2018

Int J Reprod Contracept Obstet Gynecol

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Background: Measuring the cross-sectional area of umbilical components in normal pregnant women helps in assessing the fetal abnormalities. Very few literatures were available on evaluation of reference values of cross sectional areas of umbilical cord components. The present study was conducted with the aim to determine the normal reference values of cross sectional areas of umbilical arteries, umbilical vein and Wharton's jelly and to correlate them with the gestational age of the fetus. Methods: A cross sectional study was conducted on 300 normal pregnant women at the Department of Radiodiagnosis, Sri Siddhartha Medical College, Tumakuru, Karnataka to assess the reference range of cross sectional areas of umbilical cord arteries, umbilical vein and Wharton's jelly at different gestational age of the fetus to analyze their growth. Results: A statistically significant correlation was observed between cross sectional areas of umbilical artery and vein and gestational age before and after 34 weeks (p=0.005 and 0.006 respectively) but no significant correlation was noticed with the cross-sectional area of Wharton's jelly (p=0.088). Conclusions: Cross sectional area measurements of umbilical cord components can be considered as important tools for estimation of fetal growth.

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Umbilical cord stricture and fetal intrauterine death

Cited by 14 publications

References 0 publications

Re‐Based Heterogeneous Catalysts for Olefin Metathesis Prepared by Surface Organometallic Chemistry: Reactivity and Selectivity

Re‐Based Heterogeneous Catalysts for Olefin Metathesis Prepared by Surface Organometallic Chemistry: Reactivity and Selectivity

Prenatal assessment of Wharton's jelly in umbilical cords with single artery

Antenatal sonographic assessment of cross sectional area of umbilical cord components and its reference value in normal pregnancy

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