hemodynamics (heximer) Flashcards Preview

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Flashcards in hemodynamics (heximer) Deck (26):
1

what determines pressure generation in heart (laplace)

stress (force/area)*thickness of wall/radius

2

what are 2 main diffs between R and L vents.

L has smaller r and thicker walls

3

what factors does heart try to keep fixed

wall pressure

4

what happens @ beginning of systole

AV valve closes

5

what occurs after AV closes

isovolumic contraction

6

what ends isovolumic contraction

aortic valve opens

7

what ends isovolumic relaxation

AV valve closes

8

what does a PV loop measure

LV volume vs. pressure

9

what is ESV and where on loop

end systolic vol - least V, most P

10

what is EDV and where on loop

end distolic vol. - least P, most V

11

when does mitral valve open

low P, low, V

12

when does filling occur

between mitral opening and closing (EDV)

13

what is stroke vol calculation

EDV-ESV

14

what changes P-V loops

pre and pos load

15

what is ESPVR a measure of

heart function (contractility)

16

what is EDPVR a measure of

diastolic heart compliance

17

how to calculate CO

stroke vol * HR

18

what are 2 types of factors to influence CO

1. intrinsic - hemodynamics
2. extrinisic - autonomic

19

how much can CO be changed by intrinsic during excercise

5-15L/min

20

based on starling, what will change CO

venous return (EDV)

21

what controls vent. filling (2)

venous pressure
vent compliance

22

6 factors affecting P veins

1. blood volume
2. vein compliance - symp.
3. muscle activity
4. venous contraction with valves
5. neg thoroacic pressure
6. gravity

23

how can ESV affect CO

1. lower ESV - more forceful contraction

24

what determines ESV

1. afterload (aortic pressure)
2. contraction strength

25

what P-V loop with be seen with aortic stenosis

tall thin loop to the R

26

what does direction of ESPVR indicate

left - stronger, R- weaker

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