<unk>  is a respiratory problem caused by increased resistance in the bronchioles (usually from a decreased radius of the bronchioles) that reduces the amount of air inhaled in each breath and the oxygen that reaches the pulmonary arteries. It is different from<unk>  restriction (which prevents air from diffusing into the pulmonary arteries because of some kind of blockage in the lungs).
Airway obstruction
Respiratory losses
Pulmonary aspiration
Air trapping
Air embolism
Trapped lung
Hypoxic pulmonary vasoconstriction
Diaphragmatic paralysis