phuluong2k
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A patient's airway pressure is being measured while he is breathing
into a spirometer. Which of the following lung volumes would be
associated with an airway pressure of +30 cm H2O?
A. Functional residual capacity
B. Minimal volume
C. Residual volume
D. Tidal volume
E. Total lung capacity
Plz give explanation
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| anatomy
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i think D. Tidal volume?
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| phuluong2k
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The given answer is E, but i don't have clear explanation
Any one can help
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| ssrpk
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well among the listed volumes total lung capacity has the largest volume... :arrow: greater inc. in pressure in the spirometer
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| mdwannabe
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It has to be Tot Lung Cap. B/c such positive presure can only be achieved in Inspitarion, so either TV or TLC, now TV is only about 500 to 700 ml, and 30mm H2O is quite a pressure, so it must be TLC, moreover, if you have ever seen a ventilator, the top pressure achieved is about 30mmH2O and that is at the end of inspiration, however such q seems unfair and a bit ambiguous.
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| ssrpk
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tht makes it a lot clear mdwannabe ... thnx
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| ssrpk
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it's true +30mmHg is quite a large pressure to be obtained in the spirometer so it must be some large volume and among the listed ones TD does'nt seem appropriate in front TLC
But,spirometer is unable to measure the residual volume(atleast directly) or any capacity tht has RV as it's component i.e. TLC or FRC (RV- requires helium dilution method .....not mentioned)
so this rules out A & E ..... i wud hv opted for fucntional vital capacity though but as it is not mentioned i will go with D- Tidal Volume
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| gooshipoh
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its E because its a closed system. if u know what a spirometry is u know what im talking about. if u have Pressure u can get volume of air from physics laws. it has nothing to do with how much pressure it is.
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