Phys 6

Question 1

As afterload ___ velocity ___

Answer 1

increases, decreases

Question 2

what is pre-load? after load?

Answer 2

1. LV end diastolic volume

2. pressure required to open aortic valve

Question 3

Stroke Volume =

Answer 3

EDV - ESV

Question 4

Ejection Fraction =

Answer 4

SV/EDV

*typically 55%

Question 5

Cardiac Output =

Answer 5

SV x HR

Question 6

Frank Startling Relationship states

Answer 6

the volume of blood ejected by the ventricle depends on the volume present in the ventricle at the end of diastole

Question 7

With increased pre load: what happens to EDV, afterload, and contractility?

Answer 7

EDV increases; the other two remain constant

Question 8

With increased after load: what happens to pressure, SV, and EF%?

Answer 8

you need a greater pressure; and the other two are reduced

Question 9

With increased contractility: what happens to SV and EF%?

Answer 9

they both increase (less blood left in the heart)

Question 10

Glycosides have a positive ____ effect

Answer 10

inotropic

Question 11

What is: volume work? pressure work? minute work> stroke work?

Answer 11

1. cardiac output
2. aortic pressure (most important clinically)
3. CO x aortic pressure
4. SV x aortic pressure (area within pressure volume loop)

Question 12

The Fick principle

Answer 12

CO = O2 consumption - (O2 in pulmonary v - O2 in pulmonary a)