scholarly journals OP22.02: Distribution of cardiac output and vessel diameters in growth restricted fetuses: is the fetal brain really protected?

2012 ◽  
Vol 40 (S1) ◽  
pp. 119-120
Author(s):  
E. Mullins ◽  
L. Story ◽  
T. Prior ◽  
S. Kumar
Keyword(s):  
Cardiac Output ◽  
Fetal Brain ◽  
Distribution Of Cardiac Output

Distribution of cardiac output during induced isometric exercise in dogs

1979 ◽  
Vol 236 (2) ◽  
pp. H218-H224 ◽  
Author(s):  
S. C. Crayton ◽  
R. Aung-Din ◽  
D. E. Fixler ◽  
J. H. Mitchell
Keyword(s):  
Blood Flow ◽  
Cardiac Output ◽  
Adrenergic Receptor ◽  
Isometric Exercise ◽  
Peripheral Resistance ◽  
Minute Volume ◽  
Adrenergic Blockade ◽  
Limb Muscles ◽  
Anesthetized Dogs ◽  
Distribution Of Cardiac Output

Studies were designed to characterize the distribution of cardiac output during induced isometric exercise in anesthetized dogs. The response to isometric exercise involved significant increases in heart rate (+12 +/- 3%(SE)), mean arterial pressure (+13 +/- 2%), cardiac output (+26 +/- 8%), and respiratory minute volume (+75 +/- 26%); total peripheral resistance did not change significantly. Significant changes in blood flow were observed during isometric exercise in kidneys (-18 +/- 6%) and contracting limb muscles (+453 +/- 154%). Flow to liver (hepatic artery), spleen, brain, and myocardium remained near control values. Section of spinal dorsal roots L6-L7 abolished the responses to isometric exercise except for the increase in flow to exercising limb muscles. Alpha-adrenergic receptor blockade abolished the decrease in renal blood flow during isometric exercise; however, the increase in flow to exercising limb muscles was not affected by either alpha- or beta-adrenergic blockade.

Cardiac output and organ blood flow in warm- and cold-acclimated rats exposed to cold

1968 ◽  
Vol 46 (4) ◽  
pp. 653-659 ◽  
Author(s):  
L. Jansky ◽  
J. S. Hart
Keyword(s):  
Blood Flow ◽  
Cardiac Output ◽  
Skeletal Muscles ◽  
Organ Blood Flow ◽  
Internal Organs ◽  
Exposure To Cold ◽  
Brown Adipose ◽  
Production Increase ◽  
Distribution Of Cardiac Output ◽  
Fractional Distribution

Cold acclimation increased the cardiac output of unanesthetized rats when measured at 30 °C. After exposure to 9 °C for 70 min cardiac output further increased by 46% in both warm- and cold-acclimated rats. From the changes in the fractional distribution of cardiac output after cold exposure it was shown that the blood flow increased significantly in muscular organs (heart, diaphragm, skeletal muscles) and in the adrenals of warm-acclimated rats. In cold-acclimated rats the blood flow to the brown and white adipose tissues, pancreas, kidney, intestine, liver, and other internal organs was also increased in a cold environment, and accounted for 65% of the increase in blood flow during exposure to cold compared with only 36% in warm-acclimated rats. It is estimated that the extramuscular thermogenesis can account for a greater proportion of the total nonshivering thermogenesis in cold-acclimated rats. The contribution of brown adipose tissue is estimated not to exceed about 6% of the total heat production increase in cold-acclimated rats during exposure to cold.

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