scholarly journals Long-term increase in uterine blood flow is achieved by local overexpression of VEGF-A165 in the uterine arteries of pregnant sheep

Gene Therapy ◽  
2011 ◽  
Vol 19 (9) ◽  
pp. 925-935 ◽  
Author(s):  
V Mehta ◽  
K N Abi-Nader ◽  
D M Peebles ◽  
E Benjamin ◽  
V Wigley ◽  
...  
Keyword(s):  
Blood Flow ◽  
Uterine Blood Flow ◽  
Uterine Arteries ◽  
Pregnant Sheep

Effects of hyperthermia on uterine blood flow and shunting through uterine arteriovenous anastomoses in the late-pregnant ewe

1999 ◽  
Vol 11 (5) ◽  
pp. 201 ◽  
Author(s):  
Suzanne L. Miller ◽  
Graham Jenkin ◽  
David W. Walker
Keyword(s):  
Blood Flow ◽  
Experimental Period ◽  
Respiratory Alkalosis ◽  
Uterine Horn ◽  
Arteriovenous Anastomoses ◽  
Uterine Blood Flow ◽  
Ambient Conditions ◽  
Total Blood ◽  
Uterine Arteries ◽  
Pregnant Sheep

The effect of maternal hyperthermia on uterine blood flow (UBF) through the two main uterine arteries and on the proportion of UBF shunted through uterine arteriovenous anastomoses (AVAs) was investigated. Eight late-pregnant ewes were exposed to normothermic (22–23˚C) or hyperthermic (approx-imately 39˚C) ambient conditions for 8 h. UBF was measured in the left and right uterine arteries using flow probes and microspheres were injected into the uterine artery before, during and after the experimental period. The distribution of microspheres between the uterus and lungs was determined to calculate changes in capillary and AVA blood flows. Hyperthermia produced a significant (P<0.05) increase in maternal core temperature (+1.5˚C), increase in maternal blood pH (+0.21; P<0.05) and decrease in maternal pCO 2 (–16.2 mmHg; P<0.05). Blood flow to the uterine horn ipsilateral to the corpus luteum (CL) remained unchanged during hyperthermia, whereas total UBF and blood flow to the contralateral uterine horn were significantly decreased (P<0.05), by 23.1% and 20.8%, respectively, of pre-heat control values. The proportion of UBF shunted through uterine AVAs during hyperthermia was not significantly different from values observed in normothermic ewes (21.9 0.7%). Mild to moderate hyperthermia in late-pregnant sheep induces respiratory alkalosis and decreases total blood flow to the uterus, brought about by a decrease in blood flow to the uterine horn contralateral, but not ipsilateral to the CL. Heat treatment does not alter the proportion of UBF traversing uterine AVAs.

Behavioral activity during prolonged hypoxemia in fetal sheep

1988 ◽  
Vol 65 (6) ◽  
pp. 2420-2426 ◽  
Author(s):  
A. D. Bocking ◽  
R. Gagnon ◽  
K. M. Milne ◽  
S. E. White
Keyword(s):  
Blood Flow ◽  
Eye Movements ◽  
Normal Incidence ◽  
Behavioral Activity ◽  
Uterine Blood Flow ◽  
Fetal Sheep ◽  
Pregnant Sheep ◽  
Fetal Breathing ◽  
Fetal Breathing Movements ◽  
Internal Iliac

Experiments were conducted in unanesthetized, chronically catheterized pregnant sheep to determine the fetal behavioral response to prolonged hypoxemia produced by restricting uterine blood flow. Uterine blood flow was reduced by adjusting a vascular occluder placed around the maternal common internal iliac artery to decrease fetal arterial O2 content from 6.1 +/- 0.3 to 4.1 +/- 0.3 ml/dl for 48 h. Associated with the decrease in fetal O2 content, there was a slight increase in fetal arterial PCO2 and decrease in pH, which were both transient. There was an initial inhibition of both fetal breathing movements and eye movements but no change in the pattern of electrocortical activity. After this initial inhibition there was a return to normal incidence of both fetal breathing movements and eye movements by 16 h of the prolonged hypoxemia. These studies indicate that the chronically catheterized sheep fetus is able to adapt behaviorally to a prolonged decrease in arterial O2 content secondary to the restriction of uterine blood flow.

The Effects of S(+)-Ketamine and Racemic Ketamine on Uterine Blood Flow in Chronically Instrumented Pregnant Sheep

2004 ◽  
pp. 497-502 ◽  
Author(s):  
Danja Str??mper ◽  
Wiebke Gogarten ◽  
Marcel E. Durieux ◽  
Kristian Hartleb ◽  
Hugo Van Aken ◽  
...  
Keyword(s):  
Blood Flow ◽  
Uterine Blood Flow ◽  
Pregnant Sheep ◽  
Racemic Ketamine

Regulation of types I and III NOS in ovine uterine arteries by daily and acute estrogen exposure

2000 ◽  
Vol 278 (6) ◽  
pp. H2134-H2142 ◽  
Author(s):  
Walid A. Salhab ◽  
Philip W. Shaul ◽  
Blair E. Cox ◽  
Charles R. Rosenfeld
Keyword(s):  
Nitric Oxide ◽  
Blood Flow ◽  
Smooth Muscle ◽  
Nitric Oxide Synthases ◽  
Uterine Blood Flow ◽  
Calcium Dependent ◽  
Uterine Arteries ◽  
Estrogen Exposure ◽  
The Media ◽  
Estradiol 17Β

Nitric oxide contributes to estrogen-mediated uterine vasodilation; however, the nitric oxide synthases (NOS) involved and their location within uterine arteries are incompletely documented. We investigated the effects of repetitive daily and acute estradiol-17β (E2β) exposure on uterine hemodynamics and NOS abundance and localization in uterine arteries from nonpregnant ovariectomized ewes receiving daily intravenous E2β (1 μg/kg, n = 5) or no E2β ( n = 7) for 5 days to determine NOS abundance, cGMP contents, and NOS immunohistochemistry. Daily E2β increased basal and E2β-mediated rises in uterine blood flow (UBF) 36 and 43% (<0.01), respectively, calcium-dependent NOS activity 150% ( P < 0.02) in endothelium-intact and -denuded (∼40% of total NOS) arteries, and cGMP contents 39% ( P < 0.05). Endothelial (eNOS) was detected in luminal endothelium, whereas neuronal NOS (nNOS) protein was only in the media. A second group of ewes received E2β (1 μg/kg iv) for 4 days and acute intravenous E2β ( n = 8) or vehicle ( n= 4) on day 5. UBF rose 5.5-fold ( P < 0.001) 115 min after E2β, at which time only endothelium-derived calcium-dependent NOS activity increased 30 ± 13% ( P < 0.05). Daily E2β enhances basal and E2β-mediated increases in UBF, which parallel increases in endothelium-derived eNOS and smooth muscle-derived nNOS. Acute E2β, however, selectively increases endothelium-derived eNOS.

Maternal responses to long-term hypoxemia in sheep

1989 ◽  
Vol 256 (6) ◽  
pp. R1340-R1347 ◽  
Author(s):  
T. Kitanaka ◽  
R. D. Gilbert ◽  
L. D. Longo
Keyword(s):  
Heart Rate ◽  
Blood Flow ◽  
Mean Arterial Pressure ◽  
Arterial Pressure ◽  
Blood Volume ◽  
Cardiovascular Responses ◽  
Uterine Blood Flow ◽  
O2 Uptake ◽  
Arterial Po2

To determine the maternal cardiovascular responses to long-term hypoxemia, we studied three groups of animals: 1) pregnant ewes (n = 20) at 110-115 days gestation subjected to hypoxia for up to 28 days; 2) pregnant ewes (n = 4) that served as normoxic controls; and 3) nonpregnant ewes (n = 6) subjected to hypoxemia for up to 28 days. We measured mean arterial pressure, heart rate, uterine blood flow, and uterine vascular resistance continuously for 1 h/day while the ewe was exposed to an inspired O2 fraction of 12-13% for at least 17 days. Arterial PO2, O2 saturation, hemoglobin, arteriovenous O2 difference, and uterine O2 uptake were measured daily while blood volume and erythropoietin concentration were measured weekly. In the pregnant hypoxic group arterial PO2 decreased from a control value of 101.5 +/- 5.1 to 59.2 +/- 5.1 Torr within a few minutes, where it remained throughout the study. The hemoglobin concentration increased from 8.9 +/- 0.5 to 10.0 +/- 0.5 g/dl within 24 h where it remained, whereas erythropoietin concentration increased from 16.6 +/- 2.1 to 39.1 +/- 7.8 mU/ml at 24 h but then returned to near-control levels. Arterial glucose concentration, mean arterial pressure, and cardiac output decreased slightly but insignificantly. In contrast, body weight, heart rate, blood volume, uterine blood flow, uterine O2 flow, uteroplacental O2 uptake, and the concentrations of catecholamines and cortisol remained relatively constant. Thus both pregnant and nonpregnant sheep experience relatively minor cardiovascular and hematologic responses in response to long-term hypoxemia of moderate severity.

Oxygen, glucose, and lactate uptake by fetus and placenta during prolonged hypoxemia

1995 ◽  
Vol 268 (2) ◽  
pp. R303-R309 ◽  
Author(s):  
S. B. Hooper ◽  
D. W. Walker ◽  
R. Harding
Keyword(s):  
Blood Flow ◽  
Glucose Uptake ◽  
Lactate Clearance ◽  
Gravid Uterus ◽  
Uterine Blood Flow ◽  
Fetal Circulation ◽  
Umbilical Blood ◽  
Pregnant Sheep ◽  
Lactate Uptake ◽  
Arterial O2 Saturation

Our aim was to compare the effects of short (4 h) and prolonged (24 h) periods of reduced uterine blood flow (RUBF) on fetal and placental uptake of O2, glucose, and lactate. In pregnant sheep, uterine and umbilical blood flows were measured under normal conditions and after 4 and 24 h of RUBF. A 50% reduction in uterine blood flow caused a 56% reduction in fetal arterial O2 saturation (SaO2). Umbilical blood flow increased from 325 +/- 33 to 378 +/- 32 ml.min-1.kg-1 (P < 0.05) after 4 h but was not different from pre-RUBF values after 24 h. O2 uptake by the gravid uterus was not altered by RUBF, due to an increase (84%) in uterine O2 extraction. Similarly, uteroplacental and fetal O2 consumptions and fetal glucose uptake were not affected by RUBF, whereas uteroplacental glucose uptake was significantly reduced after 4 h (by 42%) and 24 h (by 58%) of RUBF. Fetal lactate uptake was greatly reduced from 78.7 +/- 15.5 to -167 +/- 57 mumol.min-1.kg-1 after 4 h and to -198 +/- 80 mumol.min-1.kg-1 after 24 h of RUBF; negative values indicate placental lactate uptake from the fetal circulation. Thus, although RUBF significantly reduced fetal SaO2, fetal and uteroplacental O2 consumptions did not change. In addition, although fetal glucose uptake was not altered by RUBF, during RUBF the placenta became a major site of lactate clearance from the fetal circulation.

scholarly journals Local Over-Expression of VEGF-DΔNΔC in the Uterine Arteries of Pregnant Sheep Results in Long-Term Changes in Uterine Artery Contractility and Angiogenesis

PLoS ONE ◽  
2014 ◽  
Vol 9 (6) ◽  
pp. e100021 ◽  
Author(s):  
Vedanta Mehta ◽  
Khalil N. Abi-Nader ◽  
Panicos Shangaris ◽  
S. W. Steven Shaw ◽  
Elisa Filippi ◽  
...  
Keyword(s):  
Uterine Artery ◽  
Over Expression ◽  
Uterine Arteries ◽  
Pregnant Sheep ◽  
Long Term Changes

Contemporary aspects of pathogenetically substantiated therapy of adenomyosis

2016 ◽  
Vol 7 (3) ◽  
pp. 92-97 ◽  
Author(s):  
Arutyun F Arutyunyan ◽  
Sergey N Gaydukov ◽  
Vitaly N Kustarov
Keyword(s):  
Blood Flow ◽  
Conservative Treatment ◽  
Survey Data ◽  
Clinical Symptoms ◽  
Uterine Blood Flow ◽  
Uterine Arteries ◽  
Group 3 ◽  
Group 2 ◽  
Pathogenic Effects ◽  
Group 1

The purpose of our study was to assess the effectiveness of the use of drugs containing indole-3-carbinol and epigallocatechin-3 gallate in combination with effective natural methods (TES-therapy and hirudotherapy) depending on the degree of morphological adenomyosis. The study involved 205 women with diffuse adenomyosis. Based on survey data from 205 women surveyed in 67 verified adenomyosis first degree (Group 1), 79 - second degree adenomyosis (group 2), and 59 - third degree adenomyosis (group 3). Doppler results showed that in patients with adenomyosis first degree nizkorezistentny uterine blood flow was observed. Improvement of clinical symptoms of the disease, increasing the numerical values of R & D in the uterine arteries at the first degree adenomyosis indicates pathogenic effects of the proposed treatment. At the same time in patients with adenomyosis II-III degree was observed with highly bloodstream, indicating the deterioration of blood flow in the uterine vascular basin, as evidenced by some of hemostasis. Thus, studies have provided credible evidence pathogenesis mediated relations between the characteristics of the circulation of the uterus, the processes of neoangiogenesis, proliferation in the myometrium and the extent of spread of the disease, which will choose the appropriate methods of conservative treatment. Using drugs and Indinol epigallat affecting the basic pathogenetic mechanisms of adenomyosis, opens a new direction in the treatment of this disease, and effective natural methods - new opportunities in the treatment of adenomyosis.

scholarly journals Uterine blood flow responses to ICI 182 780 in ovariectomized oestradiol-17β-treated, intact follicular and pregnant sheep

2005 ◽  
Vol 565 (1) ◽  
pp. 71-83 ◽  
Author(s):  
Ronald R. Magness ◽  
Terrance M. Phernetton ◽  
Tiffini C. Gibson ◽  
Dong-bao Chen
Keyword(s):  
Blood Flow ◽  
Uterine Blood Flow ◽  
Pregnant Sheep

Distribution of uterine blood flow in the pregnant sheep

1968 ◽  
Vol 101 (3) ◽  
pp. 409-412 ◽  
Author(s):  
E.L. Makowski ◽  
G. Meschia ◽  
W. Droegemueller ◽  
F.C. Battaglia
Keyword(s):  
Blood Flow ◽  
Uterine Blood Flow ◽  
Pregnant Sheep
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