In an emphysematous patient with bullous leison which is the best investigation to measure lung volumes?
Correct Answer: Body plethysmography
Description: RV ,FRC,TLC cannot measured by spirometry. This are measured by using the helium dilution technique/ body plethysmographY. In patients with severe COPD,and with large bullae in paicular,body plethysmography is preferred because the use of helium may underestimate lung volumes. Reference:Davidson's Medicine -22nd edition,page no:675
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