Which of the following is markedly decreased in restrictive lung disease -
Ans. is 'a' i.e., FVC Pulmonary function studies in Restrictiv e lung diseaseo Forced vital capacity (FVC)-Decreased (more than obstruction)o Forced expiratory volume in 1 second (FEV1)-Decreased in proportion to FVCo FEV1/FVC-Near normal or increasedo Forced mid expiratory flow rate-Reducedo Total lung capacity-Decreasedo Residual volume-Generally decreasedo Functional residual capacity7-Decreased
FVC
FEVl
FEV1/FVC
RV
Respiratory