Venous Pooling

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Venous Pooling is also called as Venous distension.  It is the distension 
on the venous side of circuit due to the difference of the resistance and 
the fluid volume within each vessels.

For example, let's consider there are U shpe tubes as vessels.  In a U 
tubes with a distensible section at the bend, inflow and outflow pressures
are the same but the resistance to flow and the fluid volume contained in 
each tube vary with the orientation of the tube.  Especially, if the tube is
oriented with its bend downward increases the flow.  It is because the 
cardiovascular system we have is a closed circuit of constant blood, as contrast
to U-tube which is an open circuit with a fluid of unlimitedvolume.  In the 
dependent regions of the cardiovascular system, the distension will occur more 
on the venous than on the arterial side of the circuit, because the venous 
compliance is so much greater than the arterial compliance.  Such case can be 
explained when the arms are allowed to hang down the venous pooling is readily
observed on the back of hands.
This venous distension represents those caused by the hemorrhage of an equivalent 
volume of blood from the body. 
 



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Sample Problems:






Why does the distension occur more on the venous than the arterial side 
of the circuit? 




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Answers:





Because the venous compliance is much greater than the arterial compliance.
 




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For more information on this topic, please refer to Berne & Levy , Pages 214-216

Also, check out the following links that may be helpful:

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No!
Please don't make me go to any of those pages!
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This page was written by Sang Ho Ma, #612-58-5771 shma@scf.usc.edu , a student in this course.

BME 403 Pages maintained by the T.A., Douglas Miles.