In myasthenia gravis, which two pulmonary function values are the most sensitive in detecting respiratory muscle weakness?
1. TLC and VC
2. PImax and PEmax
3. VC and expired volume per unit time (VE)
4. VC and tidal volume (VT)
a. 1 and 4 only
b. 1 and 2 only
c. 3 and 4 only
d. 2 and 3 only
ANS: B
PImax and PEmax are more sensitive markers of early respiratory muscle weakness.
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