Lesson 19 (Part 2) Flashcards Preview

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Flashcards in Lesson 19 (Part 2) Deck (28)
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1

What do valves do?

They prevent the back flow of blood

2

Where are valves located? (2)

1. Heart
2. Veins

3

Stenotic valves

Dont open enough

4

Insufficiency/regurgitation

Dont close the valves enough

5

Regurgitation

Having the valves not close properly and resulting in some back flow

6

What is hydrostatic pressure equivalent to?

The weight of a column of blood

7

What does hydrostatic pressure increase with?

Distance below the heart

8

What is the hydrostatic pressure in a patient that is supine?

0 mmHg

9

What is the hydrostatic pressure in a patient that is standing?

The pressure in veins is much higher
- 100mmHg

10

What happens to the diaphragm during inspiration?

It moves down

11

What happens to the thoracic volume during inspiration?

It increases

12

What happens to the thoracic pressure during inspiration?

It decreases

13

What does inspiration allow?

Air into the lungs

14

What happens to the abdominal volume during inspiration?

It decreases

15

What happens to the abdominal pressure during inspiration?

It increases

16

What does inspiration stop?

Venous return from the lungs
- the valves shut

17

What are examples of venous hemodynamic factors?

1. Hydrostatic pressure
2. Inspiration
3. Valsalva
4. Expiration

18

Valsalva

Patient can be asked hold their breath and ‘bear down

19

What happens to the abdominal pressure during valsalva?

It increases

20

What does valsalva stop?

Venous return from the legs

21

What happens to the diaphragm during expiration?

It moves up

22

What happens to the thoracic volume during expiration?

It decreases

23

What happens to the thoracic pressure during expiration?

It increases

24

What happens to the abdominal volume during expiration?

It increases

25

What happens to the abdominal pressure during expiration?

it decreases

26

What does expiration allow?

Venous blood return from the legs
- valves open

27

When are the valves closed?

During inspiration and valsalva

28

When are the valves open?

During expiration