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Old 04-25-2015
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Default Pulm Physio question : Restrictive Lung Disease

A 78 Y/o male, comes C/O progressive shortness of breath x 7 mths.
O/E - B/L basal crackles, drum-stick like fingers.
PFT - Decreased FVC, Subnormal FEV1/FVC ratio, Increased exp flow rates.
Increased Flow rates are best explained by an INCREASE in :

A. Physioloical dead space
B. Outward chest recoil
C. Lung compliance
D. Radial Traction on airway walls
E. Wall thickness of airways
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Old 04-25-2015
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D increased traction due to fibrotic lung
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Quote:
Originally Posted by Hassan8 View Post
D increased traction due to fibrotic lung
Can you explain, please?
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Old 04-25-2015
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In restrictive lung diseases there is fibrosis of the lung tissue which puts traction on the small airways leading to decreased resistance and increased expiratory flow rates. Now one may ask then why isnt the inspiratiry flow rate increased, well my explanation would be that the lung in restrictive diseases the compliance of the lung is low due to the increaed recoil so not much air can get into lungs due to it.
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