How many Zones of the lung are there?
what is zone 1 called?
(b/c alveolar pressure collapses arterial)
what is zone 2 called?
what is zone 3 called
what is zone 4 called
what is the ideal Zone?
state the pressures in each zone
- PA > Pa >Pv
- Pa > PA > Pv
- Pa > Pv > PA
- Pa> Pisf > Pv > PA
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
Pa pressure exceeds PA pressure
after blood passes through the alveoli is "falls" into the venous system
Blood flow is proportional to Pulm Artery pressure minus the pulmonary vein pressure.
it's a pathological zone that normally is not present. it is present with Pulmonary edema
the tip of the swan should be placed in what zone?
West's zones describe the _____ in the lungs
west's zones are not "fixed" zones they are varible function zones. what does that mean
they are dependent on body position
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