PHYS 5 CO and venous return

Question 1

Cardiac function curve

what happens when venous return increases?

when that happens what happens to EDV?

and end diastolic fiber length?

this follows what mechanism?

Answer 1

• Right atrial pressure increases
• EDV and end diastolic fiber length increase
• via frank-starling mechanism

Question 2

right atrial pressure when it crosses line?

at equillibrium CO=?

Answer 2

Question 3

cardiac function curve represents what?

what would happen if we decreased inotropy?

Answer 3

Question 4

what will enhance the cardiac function curve?

depress?

Answer 4

Question 5

Vascular function curve

what will cause a complete up and right shift?

down and left?

what do either shift do to CO and right atrial pressure?

Answer 5

the up right shift would have a higher CO and right atrial pressure

while down and left would have lower CO and right atrial pressure

Question 6

what happens with change in resistance?

increase?

decrease?

Answer 6

Question 7

changes in inotropy and what happens to CO and right atrial pressure?

Answer 7

Question 8

Changes in blood volume and how it relates to CO and right atrial pressure

Answer 8

Question 9

Changes in TPR (or SVR) or afterload?

related to CO and right atrial pressure?

Answer 9

Question 10

In cardiac failure what happens?

Answer 10

Question 11

explain this graph

Answer 11