Flashcards in hemodynamics 2 Deck (30)

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1

## systolic pressure

### peak aortic pressure

2

## diastolic pressure

### minimun aortic pressure

3

## blood pressure is expressed as

### systolic/diastolic

4

##
Pulse pressure =

### Psys – Pdias = 120 – 80 = 40 mmHg

5

## Mean arterial pressure (MAP)=

###
~ Pdias + ⅓(Psys – Pdias) = 80 + ⅓(40) = 93 mmHg

(approximate because it depends on heart rate)

6

## Pulse pressure, mean pressure, and velocity all _____ through the vasculature.

### decrease

7

## C (vascular compliance) =

###
C= ΔV / ΔP

C= compliance

V is volume

P is pressure

8

## compliance represents the

### elastic properties of the vessels or chambers

9

## compliance of arteries

### absorbs energy and transforms pulsatile flow to continuous flow

10

## ____ are more compliant

### veins are more compliant that arteries

11

## compliance is determined by

### relative properties of elastin versus smooth muscle and collagen in vessel walls

12

## arteriosclerosis

###
when vessels lose compliance with age

older people have higher systolic pressure and higher pulse pressure than younger people

13

## Law of LaPlace represents the

### relationship between wall tension and transmural pressure

14

## Law of LaPlace equation

###
T = (ΔP x r) / u

T is wall stress/tension

P is Transmural pressure

r is radius

u is wall thickness

15

## tension in the wall increases as

### pressure and radius increase

16

## walls of larger vessels are subject to

### greater tension

17

## hypertension increases

### stress on walls of vessels and chambers

18

## an aneurysm increases

### the radius of the vessel and thus increases the stress on the wall. This is why it can lead to a rupture or dissection

19

## Law of LaPlace in the heart chambers

###
1. decreased wall thickness causes an increased tension

2. increased radius causes an increased tension

20

## Cardiovascular transport occurs by

###
1. bulk transport

2. transcapillary transport

21

## Bulk transport

### refers to movement of a substance through the cardiovascular system from point A to point B

22

## Transcapillary transport

### describes the movement of a substance between capillaries and tissue

23

## bulk transport equation

###
x = Q • [x]

x = rate of transport of substance x

Q= flow

[x]= concentration of substance x

24

## how much O2 carried to a muscle in a minute?

### Delivery in ml O2/min = cardiac output x O2 concentration

25

## Fick's principle is the

###
application of the bulk transport idea to substrate consumption by a capillary bed, a tissue, or the whole body.

simple conversion of mass: amount used is the amount in minus the amount out

26

## Fick's equation

###
Xused = Xi - Xo

Xused = (Q •[x]i) - (Q •[x]o)

Xused= Q ([x]i - [x]o)

27

## Q is constant through

### CV system, so it is the same for initial and final conditions.

28

## Fick’s Principle is commonly used to determine

###
cardiac output and myocardial O2 consumption

29

## Ficks equation for myocardial oxygen consumption

###
mVo2 = CO ([O2]a - [O2]v)

mVo2 = myocardial oxygen consumption (ml/min)

CO = cardiac output (L/min)

[O2]a = arterial O2 concentration

[O2]v = venous O2 concentration

30