<prompt> On spirometry decreased fevl normal FVC, increased TLC , decreased DLco2 diagnosis isBronchial asthmaEmphysemaRespiratory muscle paralysisPulmonary fibrosis  <response>: B Emphysema 431 -A-K-Jain 5th 735-sembulingam 6th 653-Davidson 224How to interpret respiratory function abnormalities AsthmaChronic bronchitisEmphvsemaPulmonary fibrosisFEV1VC-FEV1VC-TL co--K co---TLC-RV-RVResidual Volume; see text for other abbreviationsBronchial Asthma -Residual volume andfunctional residual capacity FRC are increased There is reduction in1. Tidal volume2. Vital capacity3. Forced expiratory volume in 1 second FEVj4. Alveolar ventilation5. Partial pressure of oxygen in blood Carbon dioxide accumulates, resulting in acidosis, dyspnea and cyanosisDiffusing capacity DLco useful for assessing disease affecting the alveolar-capillary bed or pulmonary vascular 1591-92-H 17thA. Decreased DLco1. Interstitial lung disease2. Emphysema3. Pulmonary vascular disease recurrent pulmonary emboli or primary pulmonary hypertensionB. Increased DLco1. Congestive heart failure2. Alveolar haemorrhage in good pasture syndromePulmonary compliance increased in express the distensibility expensibility of the lung and chest wall Emphysema Ageing Increased surfactants surface tension Dead space measured by- Nitrogen washout method Measurement of functional Residual capacity FRCA. Open circuit method-Nitrogen washout methodB. Closed circuit method- Helium Dilution Technique Diffusion capacity of lung Is measured by- carbon monoxide method 