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a decrease in the oxygen content of the blood as a result of disruption of blood circulation, increased tissue requirements for oxygen (due to excessive muscular exertion, for example), decreased exchange of gases in the lungs when they are diseased, decreased hemoglobin content of the blood (for example, in anemias), and decreased partial pressure of oxygen in inhaled air (altitude sickness). The consequence of hypoxemia is hypoxia.

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Effect of long-term oxygen therapy on survival in patients with chronic obstructive pulmonary disease with moderate hypoxaemia.
Inhaled aerosolized prostacyclin as a selective pulmonary vasodilator for the treatment of severe hypoxaemia.
Outcome of COPD patients with mild daytime hypoxaemia with or without sleep related oxygen desaturation.
2002) found that even at four litres per minute, the maximum available with demand device used in the trial, correction of hypoxaemia was only achieved in 54% of patients and this factor did not predict short term response.
Atrial right-to-left shunting causing severe hypoxaemia despite normal right-sided pressures: Report of 11 consecutive cases corrected by percutaneous closure.
2) Ventilation-perfusion mismatch is increased, causing hypoxaemia, as the blood from unventilated portions of the lungs returns to the systemic circulation without fresh oxygen.
The procedure induces noxious stimuli often associated with adverse physiological events such as raised intracranial pressure, [1] hypoxaemia and cardiovascular instability.
The consequences depend on the volume aspirated and its acidity, but at its most severe, aspiration can result in profound hypoxaemia, bronchospasm, respiratory distress syndrome and death.
The progression of metabolic changes after septic shock may lead to hypoxaemia and metabolic acidosis with a high risk of respiratory acidosis, especially in small infants who may become exhausted.
All night PSG studies simultaneously record several physiological variables (EEG, EMG, EOG, EKG, airflow at the nose and mouth, respiratory effort and oxygen saturation) and are important in confirming the diagnosis of OSAS as well as documenting the severity of sleep apnoea, hypoxaemia and sleep fragmentation.
9] Fetal cardiac contractility and output are adversely affected by hypoxaemia resulting from uteroplacental insufficiency.
But oxygen is a medication designed for people suffering from hypoxaemia or low oxygen; it does not treat breathlessness.