cardiac function curves

Question 1

what is mean circ filling pressure

Answer 1

pressure in the circulation system when there is no flow. reflects total blood volume and compliance of the entire system

Question 2

what is a cardiac function curve

Answer 2

Increase in right atrial pressure increases cardiac output.

Question 3

how does increased afterload affect cardiac function curve

Answer 3

increase afterload, decrease CO and increase RAP (down to the right) - someone in heart failure who cant overcome afterload will have reduced CO and RAP will be elevated

Question 4

how does dec afterload affect cardiac function curve

Answer 4

decrease afterload, increase SV, up to the left. (easier to get blood out)

Question 5

what is a venous return curve

Answer 5

Curve that shows the relationship between atrial pressure, mean systemic filling pressure, and resistance to blood flow.

Question 6

how does increased blood volume affect the venous return curve

Answer 6

inc BV, inc mean systemic filing pressure, shift hinge point to the right. dec volume, decrease mean systemic filling pressure, shift hinge point to the left

Question 7

how does increased compliance changes affect venous return

Answer 7

inc compliance, (dec vascular ton), decrease volume (venous return). decrease RAP

Question 8

how does decreased compliance changes affect venous return

Answer 8

dec compliance (inc vasular tone), increase volume (venous return) . increase RAP

Question 9

____ SVR, increase CO and RAP

Answer 9

decrease

Question 10

an increase in SVR will cause

Answer 10

decrease in volume.. a decrease in the slope while keeping the same mean circulation filling pressure.

Question 11

a decrease in SVR will

Answer 11

allow twice as much flow of blood, causing increase in slope and keeping the same mean circulatory filling pressure. incase RAP and CO

Question 12

what things will change the mean circulatory filling pressure

Answer 12

volume and venous compliance

Question 13

when does cardiac output equal venous return

Answer 13

steady state - frank starling

Question 14

what is the intersection of the cardiac function and venous return curves

Answer 14

equilibrium point. CO of 5 and RAP of 0

Question 15

why is the venous return curve horizontal as RAP becomes negative

Answer 15

negative pressure in the chest will cause the veins to collapse until it reaches a pressure of 0mmHg

Question 16

CO and RAP are both increased by ___ BV, ___ compliance, ____ SVR

Answer 16

increased, dec, dec

Question 17

mean circulation filling pressure is increased by ___ venous compliance, ___ in BV

Answer 17

decrease, increase