What is the effect of rheumatoid arthritis on the lung?: (A) DLco normal, (B) CXR is normal, (C) Exudative pleural effusion, (D) Flow volume pattern showing an obstructive pattern
Answer is C. Ans. C. Exudative pleural effusionLung Disease in Rheumatoid Arthritis* Most common pulmonary manifestation is pleural involvement leading to pleural friction rub and effusion.* This is due to inflammatory breakdown of pulmonary nodules.* Pleural effusions tend to be exudative with increased numbers of monocytes and neutrophils.* Interstitial lung disease. Pulmonary function testing shows a restrictive pattern (e.g. reduced total lung capacity) with a reduced diffusing capacity for carbon monoxide (DLCO).* Caplan's syndrome is characterized by the development of nodules and pneumoconiosis following silica exposure.