<prompt> Lung functions in Emphysema reveal all of the following , ExceptDecreased vital capacityIncreased diffusion capacity for carbon monoxide DLCOIncreased Total Lung capacityDecreased FEV  <response>: Answer is B Increased diffusion capacity for carbon monoxide DLCO: Emphysema is associated with a decreased diffusion capacity for carbon monoxide Lung Function Tests in Emphysema TLC : Normal or Increased FEV : Decreased 80 predicted Decreased out of propoion to FVC FVC : Decreased FEV1 FVC : Decreased 0.7 FEF25 - 75 : Decreased DLCO : Decreased Note that DLCO is normal in other obstructive lung diseases like chronic bronchitis Diffusion capacity for carbon monoxie DLCO Diffusion capacity is altered in disease affecting the functional integrity of the alveolar capillary membrane. In Emphysema, alveolar walls are destroyed, so the surface area of alveolar-capillary bed is diminished resulting in diminished DLCO. Three main disoders are associated with lowerd DLCO Emphyseinae Interstitial Lung Diseasee Pulmonary vascular disease Recurrent Pulmonary emboli or Primary Pulmonary HypeensionQ 