Ed's Cardiac Output Lecture / Final Exam Prep Flashcards Preview

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1

Cardiac Output
Formula ?

C.O = HR X SV
ml/min = beats/min X ml/beat

2

Cardiac Output (resting range)

4 - 8 L/m

3

6 Factors affecting Cardiac Output

MOBGAP

- Metabolic rate
- Oxygen demand
- Body size / type
- Gender
- Age
- Posture

4

The most potent determinate of cardiac output is

metabolic oxygen demand

5

5 Things that increase metabolism:

- exercise
- sepsis
- strong emotion
- trauma/surgery
- temperature

6

C.O. of a female Vs. C.O. of a male?

female = 10% lower than a male of the same body size

7

In general, females have ____ skeletal muscle mass than males.

Smaller

8

How do we adjust for individual differences??

- Calculate cardiac index!
- Adjusts C.O. to a
defined measurement
Of body tissue
(BSA)

9

Cardiac Index formula ?

C.O. / BSA

10

Normal adult C.I. range?

2.5 - 4.2 L/min/m2

11

How do we calculate BSA??

(w^.425)(H^.725)(.007184)

12

Advantages of CI ?

Normalizes cardiac output relative to body surface area

13

Disadvantages of CI ?

The relationship of metabolism to surface area can be very different from patient to patient

14

When is CI at its highest?

Childhood

15

Neonates may have

X3 the CI as an adult

16

when a person stands up, what happen?

C.O. decreases

17

S.V. formula =

C.O. / HR X1000

18

DO2 (delivery) formula=

CaO2 X C.O. X 10

19

PVR formula =

80 X (MPAP-PAWP) /C.O.

20

SVR formula =

80 X (MAP - RAP) / C.O.

21

Stroke volume is a function of:

A. Preload (EDP)
B. Afterload (Pa)
C. Contractility

22

Normal S.V. =

60 - 100 ml/beat

23

E.F. Formula =

S.V. X 100 / EDV

24

Normal E.F. =

65%

25

Frank-Starling Law
describes what?

relationship between SV and cardiac performance

26

Preload definition = LVEDP
y = Press
X = Volume

the amount of -myocardial fiber
stretch &/or
- amount of volume in
the ventricle
at the end of diastole

27

Afterload definition =

resistance, impedance, pressure the ventricles must overcome
To eject its blood volume

28

Clinically the most sensitive measure of afterload is ?

SVR/PVR

29

SVR formula =

(MAP-RAP) X 80
_________________
C.O.

30

PVR formula =

(MPAP - PAWP) X 80
_________________
C.O.