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Old 07-22-2013
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Default ventillation perfusion

can anyone explain me some of this concept i know that perfusion is higher in lower lobes since the effect of gravity
why ventillation also higer is lower lobe? its due to gravity? what is the effect of gravity on intrapleural pressure?
other question kaplan say that if transmural pressure is positive so there is no collapse but uworld consider the opposite i am confused
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Old 07-22-2013
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Originally Posted by cage92 View Post
can anyone explain me some of this concept i know that perfusion is higher in lower lobes since the effect of gravity
why ventillation also higer is lower lobe? its due to gravity? what is the effect of gravity on intrapleural pressure?
other question kaplan say that if transmural pressure is positive so there is no collapse but uworld consider the opposite i am confused
Yes the perfusion in lower lobes is higher and so is the ventilation but ventilation is not enough for the amount of blood.... So shunting is occuring.... In the upper lobes the ventilation is high relative to perfusion so there is a dead space....
Dont confuse this with changes in pleural pressure... Those are due to opposing forces i.e - pressure exerted by chest walll to expand and positive pressure of elastic lungs...
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Old 07-22-2013
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Originally Posted by aman_j View Post
Yes the perfusion in lower lobes is higher and so is the ventilation but ventilation is not enough for the amount of blood.... So shunting is occuring.... In the upper lobes the ventilation is high relative to perfusion so there is a dead space....
Dont confuse this with changes in pleural pressure... Those are due to opposing forces i.e - pressure exerted by chest walll to expand and positive pressure of elastic lungs...
okk but why ventilation is higher at the basee?
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Old 07-22-2013
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Originally Posted by cage92 View Post
okk but why ventilation is higher at the basee?
Its a relative value... Acc to kaplan its due to the effect of gravity
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Old 07-22-2013
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ok really thanks for explanation
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