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What is In moderate severity obstructive lung disease, the expected abnormalities include the following except- and explain in detail?
In moderately severe obstructive lung diseases,FEV1/FVC ratio will be less than 0.7 and FEV1 will be 50-80% predicted.TLC will be increased,FRC is more severely elevated due to loss of lung elastic recoil & dynamic hyperinflation.RV is very severely elevated due to airway closure.Vital capacity will be decreased.So FRC/TLC will be increased in obstructive lung diseases. Reference:Harrison's Medicine-20TH edition