Depression of uterine blood flow in response to cord compression in sheep

1982 ◽  
Vol 60 (6) ◽  
pp. 825-829 ◽  
Author(s):  
M. K. W. Cottle ◽  
G. R. Van Petten ◽  
P. van Muyden
Keyword(s):  
Blood Flow ◽  
Fluid Pressure ◽  
Cardiovascular Effects ◽  
Cord Compression ◽  
Tissue Fluid ◽  
Uterine Blood Flow ◽  
Fetal Hypoxia ◽  
Third Trimester ◽  
The Third ◽  
Stimulation Of

Seven conscious chronically cannulated ewes and their fetuses were studied in the third trimester of pregnancy. Compression of the umbilical cord for 4 min, to a degree simulating the occurrence in clinical obstetrics, not only produced the expected fetal hypoxia, acidemia, and cardiovascular effects but also significantly reduced uterine blood flow. In a ewe with twin fetuses, compression of the cord to only one fetus decreased the flow to that horn and had no effect on flow to the other horn. It is postulated that the reduction in uteroplacental flow was due to stimulation of α-adrenoceptors in the maternal placental vasculature by catecholamines of fetal origin, or the effects of increased tissue-fluid pressure in the fetal placenta, or a combination of these mechanisms.

scholarly journals Collateral Uterine Blood Flow in Holstein Cows during the Third Trimester of Pregnancy

2006 ◽  
Vol 52 (5) ◽  
pp. 663-668 ◽  
Author(s):  
Takehiro NISHIDA ◽  
Kenji HOSODA ◽  
Hiroki MATSUYAMA ◽  
Motohiko ISHIDA
Keyword(s):  
Blood Flow ◽  
Holstein Cows ◽  
Uterine Blood Flow ◽  
Third Trimester ◽  
The Third

scholarly journals Effect of Lying Behavior on Uterine Blood Flow in Cows During the Third Trimester of Gestation

2004 ◽  
Vol 87 (8) ◽  
pp. 2388-2392 ◽  
Author(s):  
T. Nishida ◽  
K. Hosoda ◽  
H. Matsuyama ◽  
M. Ishida
Keyword(s):  
Blood Flow ◽  
Uterine Blood Flow ◽  
Third Trimester ◽  
The Third

Cardiovascular effects of dobutamine during exercise in dogs

1989 ◽  
Vol 257 (3) ◽  
pp. H954-H960
Author(s):  
G. C. Haidet ◽  
T. I. Musch ◽  
D. B. Friedman ◽  
G. A. Ordway
Keyword(s):  
Skeletal Muscle ◽  
Heart Rate ◽  
Blood Flow ◽  
Adrenergic Receptors ◽  
Adrenergic Receptor ◽  
Maximal Exercise ◽  
Cardiovascular Effects ◽  
Receptor Reserve ◽  
Concomitant Reduction ◽  
Stimulation Of

To test the hypothesis that stimulation of adrenergic receptors in the heart is maximal during maximal exercise, and to determine whether generalized stimulation of adrenergic receptors during strenuous exercise produces significant alterations in the normal regional distribution of blood flow that occurs during exercise, we evaluated the cardiovascular effects of the infusion of dobutamine (40 micrograms.kg-1.min-1) in mongrel dogs during treadmill running. During maximal exercise, the dobutamine infusion resulted in a significant (P less than 0.05) increase in heart rate. Exercise capacity, total body O2 consumption (VO2), and maximal arteriovenous O2 difference, however, each were reduced during the infusion of this drug. A concomitant reduction in maximal blood flow to locomotive skeletal muscle occurred. The infusion of dobutamine also resulted in an increase in heart rate at a strenuous level of submaximal exercise. However, unlike during maximal exercise, VO2 was unchanged. Blood flow to locomotive skeletal muscle increased, and there was a concomitant reduction in arteriovenous O2 difference. Blood flow reductions that normally occur in splanchnic circulations during strenuous and during maximal exercise were generally somewhat attenuated during the infusion of this drug. Thus, dobutamine, a sympathomimetic agent, produces significant cardiovascular effects when infused in high doses during exercise. Our results demonstrate that beta-adrenergic receptor reserve exists in the heart during maximal exercise in dogs. In addition, the peripheral responses that occur during the infusion of the drug provide additional evidence that different degrees of adrenergic receptor reserve normally appear to be present within different regional circulations during strenuous and during maximal exercise.

Effect of coffee intake on blood flow and maternal stress during the third trimester of pregnancy

2005 ◽  
Vol 92 (1) ◽  
pp. 19-22 ◽  
Author(s):  
H. Tsubouchi ◽  
K. Shimoya ◽  
S. Hayashi ◽  
M. Toda ◽  
K. Morimoto ◽  
...  
Keyword(s):  
Blood Flow ◽  
Maternal Stress ◽  
Third Trimester ◽  
Coffee Intake ◽  
The Third

Study of retinal blood flow in pregnant women with diabetes mellitus

2021 ◽  
pp. 117-120
Author(s):  
N.V. Pomytkina ◽  
◽  
E.L. Sorokin ◽  
Y.E. Pashentsev ◽  
◽  
...  
Keyword(s):  
Diabetes Mellitus ◽  
Blood Flow ◽  
Optical Coherence Tomography ◽  
Pregnant Women ◽  
Main Group ◽  
Retinal Blood Flow ◽  
Control Group ◽  
Vascular Density ◽  
Third Trimester ◽  
The Third

Purpose. To investigate changes in retinal blood flow in pregnant women with diabetes mellitus (DM) using optical coherence tomography in angiography (OCTA) mode. Material and methods. 60 pregnant women were examined. The main group consisted of 24 women with DM type 1 and type 2. The control group was represented by 36 healthy women with physiological pregnancy. Women underwent OCTA on an Optovue RTVue XR Avanti device (Optovue Inc., USA) using the HD Angio Retina 6.0 mm scanning protocol. The total vascular density (TVD), foveal vascular density (FVD), and the area of the foveal avascular zone (AFAZ) in the superficial retinal plexus were studied. The survey was carried out in all trimesters of pregnancy in the main group, in the control group – in the third trimester. Results. When conducting a comparative analysis, no significant differences in the values of TDV and AFAZ were found between the main group and the control group. FVD values in pregnant women with diabetes were statistically significantly lower relative to the control group (p=0.001). There were no significant differences in FVD values in the subgroups of pregnant women with diabetic retinopathy (DR) and with diabetes and the absence of DR in the third trimester (p=0.114). However, AFAZ indices in patients with DR were significantly higher (p=0.039), and TDV – significantly lower in comparison with pregnant women with diabetes and no DR (p=0.035). Conclusions. 1. In pregnant women with diabetes in the third trimester, a statistically significant decrease in FPS in the superficial retinal plexus was revealed in comparison with healthy women with physiological pregnancy, in the absence of significant differences in TDV and AFAZ. 2. In pregnant women with DR in the third trimester, a statistically significant expansion of AFAZ with a decrease in TDV in the superficial plexus was revealed in comparison with pregnant women with DM and no DR. Key words: diabetes mellitus, diabetic retinopathy, optical coherence tomography in angiography mode, retinal blood flow.

scholarly journals Prenatal Ambient Air Pollutants Influence Fetal Blood Flow and Shunting to the Brain in the Third Trimester

2020 ◽  
Vol 2020 (1) ◽  
Author(s):  
C.V. Breton ◽  
A. Peterson ◽  
R. Habre ◽  
F. Lurmann ◽  
M. Amin ◽  
...  
Keyword(s):  
Blood Flow ◽  
Air Pollutants ◽  
Ambient Air ◽  
Fetal Blood ◽  
Third Trimester ◽  
The Third ◽  
Ambient Air Pollutants ◽  
The Brain
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