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Above approximately 4,300 m (14,000 ft) oxygen-rich breathing mixture is required to approximate the oxygen available in the lower atmosphere, [4] while above 12,000 m (40,000 ft) oxygen must be provided under positive pressure. Above 15,000 m (49,000 ft), respiration is not possible because the pressure at which the lungs excrete carbon ...
Supplemental oxygen is needed for flying more than 30 minutes at cabin pressure altitudes of 12,500 feet (3,800 m) or higher, pilots must use oxygen at all times above 14,000 feet (4,300 m) and each occupant must be provided supplemental oxygen above 15,000 feet (4,600 m).
Oxygen therapy, also referred to as supplemental oxygen, is the use of oxygen as medical treatment. [1] Supplemental oxygen can also refer to the use of oxygen enriched air at altitude. Acute indications for therapy include hypoxemia (low blood oxygen levels), carbon monoxide toxicity and cluster headache .
The minimum required flight crew must be on supplemental oxygen if the plane spends any time above an equivalent effective cabin altitude of 4,300 m (14,000 ft), and even the passengers must be provided with supplemental oxygen above an equivalent effective cabin altitude of 4,500 m (15,000 ft). [8]
Only brief trips above 6,000 metres (20,000 ft) are possible and supplemental oxygen is needed to avert sickness. As altitude increases, the available amount of oxygen to sustain mental and physical alertness decreases with the overall air pressure, though the relative percentage of oxygen in air, at about 21%, remains practically unchanged up ...
A nasal cannula is generally used wherever small amounts of supplemental oxygen are required, without rigid control of respiration, such as in oxygen therapy. Most cannulae can only provide oxygen at low flow rates—up to 5 litres per minute (L/min)—delivering an oxygen concentration of 28–44%.
Oxygen therapy is the use of supplemental oxygen as medical therapy. [46] Acute indications for therapy include hypoxemia (low blood oxygen levels), carbon monoxide toxicity, cluster headache and decompression illness. It may also be prophylactically given to maintain blood oxygen levels during the induction of anesthesia. [47]
These masks are removed from packaging and plugged into the socket for oxygen supply. [citation needed] On the Boeing 777-300ER and Boeing 787, oxygen masks only consist of the mask and tube. Passengers breathe into the mask to start oxygen flow, and there are no side straps, as the mask adjusts automatically. [clarification needed] [citation ...