<prompt> In upper airway obstruction, all of the following changes are seen exceptDecreased maximum breathing capacityRV decreasedDecreased FEVDecreased vital capacity  <response>: Changes in lung function tests in obstructive lung diseases- Eg: EmphysemaTLC- IncreaseRV- IncreaseFRC- IncreasePeak expiratory flow rate- DecreaseFEV1- Decreased out of proportion to FVC Forced vital capacityForced expiratory vital capacity FEVC- Normal to slightly decreasedFEV1FEVC- Decreased May decrease as low as 20-30 Changes in lung function tests in restrictive lung diseasesTLC- DecreasedRV- DecreasedFRC- DecreasedForced mid-expiratory flow rate- DecreaseFEV1- Decreased in proportion to FVC Forced vital capacityForced vital capacity FVC- Decreased FEV1FEVC- Near-normal or increased.Lung compliance- decreasedDiffusion capacity- decreased 