Clarify - cardiac & vascular Function curve FApg 252

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Chutku

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Cardio - pg 252 FA
Three major things can change the cardiac and vascualr function curves -
Inotropes
Cardiac Output
TPR

I am OK with the first two but BRS Physio says that changes in TPR do not change the mean Systemic Pressure. There is a counter-clockwise rotation of the venous return curve for increased TPR because of decrease venous return; the CO curve changes because there is decreased CO. However the RA pressure does not change.
FA shows the venous return curve for hemmorhage to be parallel to the venous return curve (correct) but the increased TPR curve should not be the same (??) since it does not reach the same Mean systemic pressure.

WTF ?? am I just loosing it?
on the other hand if there is hemmorhage then decreased blood volume and TPR would increase - just the end point of the curve does not make much sense.

Any ideas...

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I don't think that increased TPR would affect this. Mean systemic pressure is a venous value, and TPR has to do with arterioles. I think the graph in FA just sucks.

Maybe I'm wrong. I haven't really given it much thought.
 
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