rman
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15. The graph shows an isovolumetric pressure-flow curve obtained at 25% of total lung capacity. An increase in which of the following is most likely to increase the plateau value of the expiratory flow rate?
A) Airway resistance
B) Amount of surfactant in the alveolar space
C) Ciliary beating frequency
D) Expiratory effort
E) Lung volume
F) Parasympathetic activity of fibers innervating the airways
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Edited by rman on 06/24/06 - 05:11 PM
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| rman
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Anyone?
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| mjl1717
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d- expiratory effort- but i thought for more than 1 minute
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| rman
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I think volume; increase in volume will further decrease pleural pressure causing an increase in flow. also, this appears to be a case of restrictive lung disease (25% capacity). increasing effort makes less sense to me but also could be right...
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| nadiabarati
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D
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| rman
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Explanation??
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| rman
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The questions is at 25% total lung capacity. I'm not sure increasing effort would help all that much...
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| docarchana
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i think D. but is it right?
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| muzammil
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isnt it the case that max expirtory flow rate is effort inipendent?
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| fox
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I think its A...sorry no explanation right now but will get back with one
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| mohelgamal
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Fox increase air way resistence will decrease flow rate.
incresing effort I think is wrong answer because the platea is the part of the curve st which the flow will not increase even with increasing the respiratory effort.
I think the correct answer is increase lung volume
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| fox
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Mohelgamal....thanks for correcting an old post. Sorry I answered A thinking about DECREase in airway resistance ....didnt really pay attention to the Q. BTW..this Q has been beautifully explained by Leopard in yesterday's post. You are rite. The answer is lung volume.
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| ManuNastai
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D
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| ssrpk
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agree with muzammil, as the max. expiratory flow rate is effort independent! why is tht? well! the main resistance to flow rate is due to the collapse of brochioles due to higher pleural pressure, therefore increasing the expiratory effort due to inc. pleural pressure will further collapse the bronchioles!
on the other hand increasing the lung volume should keep those brochioles patent, as pressure of the flowing air thru the bronchioles wud counteract the pleural pressure and the keep it from collapsing! [ever wonder why patients with COPD breathe with pursed lips]
this is just a normal lung with its flow measured at 25% of total lung capacity!
if expiratory flow rate were to be measured at 100% of total lung capacity, the plateau wud definitely be raised!
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