Hemodynamic Concepts

Question 1

what is SV dependent on?

Answer 1

preload, afterload, contractility

Question 2

CO =

Answer 2

HR * SV

Question 3

normal CO?

Answer 3

4-8L/min

Question 4

CI

Answer 4

more meaningful than CO
2.5-4 L/min/m^2

Question 5

if CO is low, what is the first sign?

Answer 5

increased HR, happens before BP drops

Question 6

SV

Answer 6

Left ventricular ejected volume, 50-100mL/beat

Question 7

What are each ventricles preload measurements?

Answer 7

Right- CVP
Left- PAOP

Question 8

What is preload?

Answer 8

the volume/pressure in the ventricle at the END of diastole, after the AV valves close

Question 9

What is afterload?

Answer 9

the pressure against which the ventricle must pump to open the pulmonic and aortic valve

Question 10

What are each ventricles afterload measurements?

Answer 10

Right- pulmonary vascular resistance PVR
Left- systemic vascular resistance SVR

Question 11

What measurements change when preload increases?

Answer 11

SV and CO increase to a point

Question 12

What measurements change when afterload increases?

Answer 12

SV and CO decrease

Question 13

What measurements change when contractility increases?

Answer 13

SV and CO increase

Question 14

MAP formula

Answer 14

DBP + 1/3(SBP-DBP)

Question 15

CI formula

Answer 15

CO / BSA

Question 16

stroke index

Answer 16

25-45 mL/beat/m^2, SV + BSA

Question 17

CVP normal

Answer 17

3-8 cm H20

Question 18

pulmonary artery pressure normal

Answer 18

20/8-30/15 mmHg

Question 19

pulmonary artery occlusion pressure

Answer 19

8 - 12 mmHg

Question 20

systemic vascular resistance

Answer 20

800-1200 dynes/s/cm^-5

Question 21

pulmonary vascular resistance

Answer 21

50-250 dynes/s/cm^-5

Question 22

mixed venous oxygen saturation (Sv02)

Answer 22

60-75%

Question 23

central venous oxygen saturation (Scv02)

Answer 23

> 70%

Question 24

arterial oxygen saturation (Sa02)

Answer 24

95-99%