What is true for restrictive lung disease?: (A) FEV1/FVC decreased, compliance normal, (B) FEV1/FVC increased, compliance increased, (C) FEV1/FVC decreased, compliance increased, (D) FEV1/FVC increased, compliance decreased
Answer is D. In Restrictive lung disease, parenchymal involvement will lead to pulmonary fibrosis and hence it will be difficult to inflate the lung leading to the reduction in lung compliance. The FEV1/ FVC ratio is increased in restrictive lung disease because the numerator and denominator in the ratio are both reduced in restrictive lung disease, with FVC decreasing dispropoionately.