When we first meet Dory, she's just swimming around minding her own business when suddenly she bumps into Marlin and instantly offers to help him hunt down his son.
Chronic obstructive pulmonary disease (COPD) is a leading cause of death and disability internationally. Alveolar hypoxia and consequent hypoxemia increase in prevalence as disease severity increases.
Common causes of hypoxemia include: 1  A blocked airway. 2  Anemia. 3  ARDS (acute respiratory distress syndrome). 4  Certain medications, such as narcotics and anesthetics, which depress breathing. 5  Congenital heart disease â heart defects that are present at birth. 6  COPD (chronic obstructive pulmonary disease). 7  Emphysema. 8  High altitudes.