drhouse
Forum Senior
Topics: 21
Posts: 192
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Goljan says.
Atelectesis is an example of Ventilation without perfusion and pulmonary embolism is an example of perfusion without ventilation.
now i dont understand this.
in atelectesis there will be loss of surface area, how there could be ventilation, and in pulmonary embolism, how ther could be perfusion.....
pl somebody explain me
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| bioguy
Forum Guru
Topics: 47
Posts: 841
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yeah, you are right. goljan sir might have made a mistake! do you mean his lectures? because i just checked the Rapid Review and its correctly written in it. "Pulmonary embolism - No O2 exchange in lungs that are ventilated but not perfused".
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| faraym
Forum Addict
Topics: 23
Posts: 793
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Drhouse ,
In his lectures he says that ARDS is a ventilation defect and pul.embolism is a perfusion defect.
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| drduck
Forum Guru
Topics: 82
Posts: 529
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i think its the other way around....
pulm embolism leads to defect in perfusion but the lung is still ventilated properly...so venti is normal and perfusion is defective or decreased
other case is of atelect. here the lung has lost its ventila capacity ....but is still perfused normally...so perfusion is normal but ventil has decreased.
in either case we have a VENTILATION PERFUSION MISMATCH.
only thing is how to find it out....
in cases where lungs is not perfused totaly as in PE, if we give 100% O2 the patient will improve as....less blood carries more O2...which is possible....
but in cases of ventilation defects or shunting....no improvement occours even if supplied with 100% O2....as part of that lung is not ventilating....
hope that gives u some idea...
donno about goljan
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| drhouse
Forum Senior
Topics: 21
Posts: 192
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thanks bioguy and farayam for the correction
its written in goljan systemic patho. page no. 79.. (i think edition is 2004)
i have not checked rapid review and i might have missed it in the lecture....
i think i need to listen it again..
thanks anyway
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