In which of the following conditions is total lung capacity (TLC) always reduced?
a. Restrictive lung disease
b. Obstructive lung disease
c. Combined restrictive and obstructive dis-ease
d. Acute airways obstruction
ANS: A
The TLC is always reduced in restrictive lung diseases because of a loss of lung volume; the RV and functional residual capacity are often reduced proportionately.
Carbon monoxide (CO) is the gas normally used to measure the DL.
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