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Old 02-24-2015
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Question Cardiac/Vascular Function Curves?

Hello everyone,

I have a question regarding the Cardiac/Vascular Function Curves.

In FA (page 269 in 2014 edition | page 275 in 2015 edition), it says in the second row in the table that "Changes in circulating volume or venous tone --> Altered RA pressure for a given CO".

However, according to my understanding, this should be replaced with "Altered VR for a given RA pressure".

Or maybe what they mean is the RA pressure will be altered for a given CO at the operating point of the heart (Equilibrium "steady state" point)!!

I thought I understood the concept behind these curves, but apparently I didn't.

I'm confused about this, could someone explain this to me, please?

Thanks in advance.

Have a good day
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Old 02-25-2015
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Quote:
Originally Posted by dr_awaheed View Post
Hello everyone,

I have a question regarding the Cardiac/Vascular Function Curves.

In FA (page 269 in 2014 edition | page 275 in 2015 edition), it says in the second row in the table that "Changes in circulating volume or venous tone --> Altered RA pressure for a given CO".

However, according to my understanding, this should be replaced with "Altered VR for a given RA pressure".

Or maybe what they mean is the RA pressure will be altered for a given CO at the operating point of the heart (Equilibrium "steady state" point)!!

I thought I understood the concept behind these curves, but apparently I didn't.

I'm confused about this, could someone explain this to me, please?

Thanks in advance.

Have a good day
If you are talking about the VR what is it ??
It is the amount of blood coming into the Rt side of the heart via SVC and IVC

So, if VR is that , definitely it should be effected by anything that dilates and/or constricts those TWO BIG VEINS (SVC & IVC)

I learned, dilating artery = more FLOW(Q) (Ref: Dr.Qudrath Lectures)
dilating vein = less FLOW(Q)

So, if we Veno-Dilate = LESS Q to the RT side of the Heart ! and vice versa

The other way you can change the volume (circulatory Volume) is by infusing volume (increases volume) or hemorrhage where you decrease the volume

Now, coming to whats written in FA and your question
Changes in circulating volume or venous tone leads to altered RA pressure

My Question WHY NOT ???
The Pressure coming in RA is definitely because of venous tone (SVC & IVC) and the circulating volume in those veins

Hope it helps !
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