Hey guys, I have something that I can't seem to find well-explained. Venous return and cardiac output curves use right atrial pressure on the X-axis. Costanzo says that it is used as a proxy for end diastolic volume but does not explain why right atrial pressure can be used instead in this instance. BRS Costanzo, firecracker/FA, internet don't explain it either. I had a TA say that it can be used because the pressure difference between the right atrium and the ventricle is the driving force for blood to fill the ventricle, but I want to get confirmation of this from a more reliable resource. Has anyone heard this explanation/read it before? Thanks!
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Cardiac Physio- Right atrial pressure as a proxy for EDV
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