Zones of the Lung Flashcards Preview

► Med Misc 44 > Zones of the Lung > Flashcards

Flashcards in Zones of the Lung Deck (15)
1

How many Zones of the lung are there?

 

4

 

2

what is zone 1 called?

collapse

(b/c alveolar pressure collapses arterial)

3

what is zone 2 called?

waterfall

 

4

what is zone 3 called

 Distension

5

what is zone 4 called

Interstitial pressure

6

what is the ideal Zone?

zone 3

7

state the pressures in each zone

  1. PA > Pa >Pv
  2. Pa > PA > Pv
  3. Pa > Pv > PA
  4. Pa> Pisf > Pv > PA

8

Zone 1:

Explain it

Pulm artery pressure negigilble bc Alveolar pressure exceeds it, the distensible cappilieries in the alveolar wall are collapsed. There is NO blood flow in Zone 1

it is normally not present.. its a pathological  zone that develops with pulmonary HYPOtension

9

Zone 2:

explain it

Pa pressure exceeds PA pressure

after blood passes through the alveoli is "falls" into the venous system

 

10

 Zone 3:

explain it

Blood flow is proportional to Pulm Artery pressure minus the pulmonary vein pressure. 

11

 Zone 4:

explain it

it's a pathological zone that normally is not present. it is present with Pulmonary edema

12

the tip of the swan should be placed in what zone?

3

13

Must Know:

West's zones describe the _____ in the lungs

 

perfusion

14

Must Know:

west's zones are not "fixed" zones they are varible function zones. what does that mean

they are dependent on body position

15

Must Know:

why is zone 3 the best zone?

Zone 1 is found in the Non-dependent lung

Zone 3 is found in the dependent lung

hence zone 3 is better perfused and ventilated

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