Intrathoracic Vascular Pressures Flashcards Preview

AP: Cumulative > Intrathoracic Vascular Pressures > Flashcards

Flashcards in Intrathoracic Vascular Pressures Deck (26):
1

List some of the intrathoracic vascular pressures

PA
CVP
R. Atrial
R. Ventricular
L. Atrial

2

Define compliance

Change in volume / change in pressure

3

How do you calculate lung compliance?

Vt / P

4

How do you calculate thoracic compliance?

Vt / P pleural

5

How do you calculate total compliance?

Vt / Paw

6

What are the normal values for lung compliance, thoracic compliance, and total compliance?

CL= 200 mL/cmH2O
CT= 200 mL/cmH2O
CLT= 100 mL/cmH2O**

7

How do lung, thoracic, and total compliance mathematically relate to each other?

Ohm's law

Lungs and chest wall in series
Lungs in parallel with each other

8

What is the difference between dynamic compliance and static compliance?

Dynamic compliance is measured while the patient is breathing

Static compliance is measured at equilibrium and is easily reproduced

9

When during a spontaneous respiratory cycle do you make hemodynamic measurements?

End expiration

10

Why do you make hemodynamic measurements during end expiration of a ventilatory cycle?

Because the patient spends the most time in expiration

Also, It is the point at which Long's tendency to collapse and Chestwall's tendency to expand our equal

11

Define transmural filling pressure

Pressure across the vessel wall

Normal= 5-8

12

If the lung compliance and thoracic compliance are normal what is the percent transmission of IVP?

50%

13

If the lung compliance is normal and the thoracic compliance is increased what is the percent transmission for IVP?

<50%

14

What is an example of when the lung compliance would be normal but the thoracic compliance would be increased?

Thoracotomy or laparotomy

15

When the lung compliance is normal in the thoracic compliance is decreased what is the percent transmission of IVP?

>50%

16

What is an example of when the lung compliance would be normal in the thoracic compliance would be decreased?

Stiffer chest wall (swollen neonate ex)

17

When the lung compliance is Increased in the thoracic compliance is normal what is the percent transmission of IVP?

>50%

18

What is an example of when the long compliance would be increased but the thoracic compliance would be normal?

Emphysema

19

When the lung compliance is decreased in the thoracic compliance is normal what is the percent transmission of IVP?

<50%

20

What is an example of a condition where the lung compliance would be decreased in the thoracic compliance would be normal?

Fibrosis

21

When the lung compliance is increased in the thoracic compliance is decreased what is the percent transmission of IVP?

>>50%

22

What is an example of a condition where the lung compliance would be increased in the thoracic compliance would be decreased?

Advanced emphysema

23

How would you change your ventilation settings in a patient with increased lung compliance and decreased thoracic compliance?

Decrease inspiratory pressure
Increase expiratory time
Decrease flows

24

Winlong compliance is decreased and thoracic compliance is increased what is the percent transmission of IVP?

<<50%

25

What happens to the percent transmission of IVP when both lung compliance and thoracic compliance are increased together or decreased together?

Depends

26

What happens to lung compliance and thoracic compliance in infant respiratory distress syndrome (IRDS)?

Both decreased