The blood pressure in arteries entering the placentae of guinea pigs, rats, rabbits, and sheep

  title={The blood pressure in arteries entering the placentae of guinea pigs, rats, rabbits, and sheep},
  author={Waldemar Moll and Wolfgang W F K{\"u}nzel},
  journal={Pfl{\"u}gers Archiv},
SummaryThe blood pressure in arteries entering the placenta-the preplacental pressure-was measured in guinea pigs, rats and rabbits which have hemochorial placentae and in sheep which have an epitheliochorial placenta.It was found that in pregnant guinea pigs, pregnant rats and pregnant rabbits the preplacental blood pressure was 12 (SD=3), 14 (SD=1) and 8 (SD=2) Torr respectively. In pregnant sheep, however, the preplacental blood pressure was 84 (SD=9) Torr.The central arterial pressure was… Expand
The blood pressure in the decidual part of the uteroplacental arteries (spiral arteries) of the rhesus monkey
It was concluded that the intervillous space of the hemochorial placenta of the rhesus monkey offers only a minor resistance to maternal placental flow when the uterus is relaxed, substantiating the Starling resistor model of placental circulation. Expand
Maternal Vascular Compliance of Placentas in Rabbits
MATERNAL PLACENTAL VASCULAR COMPLIANCE IN RABBITS by Gwen Matthews Brownfield The incidence of maternal and infant morbidity and mortality has led to a continued study into the physiology andExpand
Chronic hypoxia diminishes the proliferative response of Guinea pig uterine artery vascular smooth muscle cells in vitro.
The data were consistent with the hypothesis that chronic maternal hypoxia compromises the capacity for growth and remodeling of the uterine artery during pregnancy, perhaps by interfering with the ability of vascular smooth muscle cells to de-differentiate to a proliferative phenotype. Expand
Development of an artificial placenta I: pumpless arterio-venous extracorporeal life support in a neonatal sheep model.
Pumpless AV-ECLS can support gas exchange and maintain fetal circulation in a neonatal lamb model for a 4-hour period and is hampered by high cannula resistance and declining device flow. Expand
Pregnancy-induced long-term uterine vascular remodeling in the rat.
The results indicated a significant difference between the previously-pregnant and virgin rats in both internal and external arterial diameters (but not arterial wall thickness), as well as the uterine horn length, 3 weeks postpartum, but not 8-9 and 13 weeks post partum. Expand
Uterine Hemodynamics During Pregnancy ; Blood Flow Patterns and the Importance of Placentation Type Uterine vascular anatomy
blood flow a ml/min; total 700 ml/min, w the remaining estimate was In experime relative chang those of huma ing from 10t 10, 15, 26, 37, Since bloo unchanged du changes are decrease in ut plished byExpand
Myoendometrial versus placental uterine arteries: structural, mechanical, and functional differences in late-pregnant rabbits.
The increased size and diminished tone of placental compared with adjacent myoendometrial arteries would favor increased blood flow to the placenta; differences in size and passive mechanical properties suggest that a localized factor(s) originating from the fetus or Placenta contributes to the gestational enlargement of those arteries that perfuse the placental. Expand
Gestation-induced uterine vascular remodeling.
It is shown that alterations of the renin-angiotensin-aldosterone system, by manipulating sodium intake in the rats, reduced the pregnancy-induced remodeling of uterine arteries, which resulted in the birth of pups that had characteristics of intrauterine growth restriction or in the development in the mother of "experimental" gestational hypertension, depending on, respectively, restriction or increased of sodium intake. Expand
Enhanced Vascular Smooth Muscle Calcium Sensitivity and Loss of Endothelial Vasodilator Influence Contribute to Myogenic Tone Development in Rat Radial Uterine Arteries during Gestation
Pressure-dependent uterine artery tone increases with gestational age due to a combination of RhoA-mediated increases in VSM calcium sensitivity and a loss of endothelial NO influence. Expand
Site-Specific Increases in Utero- and Feto-Placental Arterial Vascular Resistance in eNOS- Deficient Mice Due to Impaired Arterial Enlargement 1 Running title: Utero- and fetoplacental arteries in eNOS -/- mice
It is concluded that previously observed decreases in uterine and umbilical blood flows in eNOS -/pregnancies are associated with markedly divergent structural changes in the uteroplacental versus fetoplacents circulations. Expand


Blood pressures in the uterine vascular system of anaesthetized pregnant guinea pigs
For the pregnant guinea pig, only 1/3 of the total uterine vascular resistance is located in the placental channels, and two thirds of the vascular resistance of the uterus are Located in the arteries outside the uterus. Expand
Circulation in the maternal placenta of primates.
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  • Medicine
  • American journal of obstetrics and gynecology
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Generalizations about the placenta of the monkey based on study of 23 injected, in situ placentas of Macaca mulatta pregnant for periods of time ranging from 19 to 154 days are applied. Expand
The uteroplacental vascular relationship in the human.
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  • Biology, Medicine
  • American journal of obstetrics and gynecology
  • 1968
It is demonstrated that in the human condition, as in the rhesus monkey, each cotyledon is supplied by one spiral artery which is located beneath the central empty space of the cotYledon and that this is the preferential site of entry. Expand
~oetal and neonatal physiology, pp. 47--50
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  • 1968
Action de la noradr~nalin et de l'adr~naline sur la circulation embryonnaire du poulct
  • C. R. Acad. Sci. (Paris)
  • 1967
Some aspects of the comparative physiology of placental gas exchange
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  • 1965