Hypoxia (medical)
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Hypoxia is a pathological condition in which the body as a whole (generalized hypoxia) or region of the body (tissue hypoxia) is deprived of adequate oxygensupply.
Hypoxia is often associated with high altitudes, where it is called altitude sickness. Hypoxia can also occur while diving underwater, especially with closed-circuit rebreathersystems that control the amount of oxygen in the air breathed in.
Symptoms of generalized hypoxia depend on its severity and speed of onset. They include headaches, fatigue, shortness of breath, nausea, unsteadiness, and sometimes even seizuresand coma. Severe hypoxia induces a blue discoloration of the skin (deoxygenated blood cells lose their bright red color in favor of a dark blue/red color).
Categories of hypoxia
- Cerebral hypoxiain which the brain is deprived of oxygen despite normal blood flow.
- Hypoxic hypoxiawhen there's an inadequate supply of oxygen (as caused by high altitudes).
- Anemic hypoxiain which arterial oxygen pressure is normal, but total oxygen content of the blood is reduced.
- Hypemic Hypoxiawhen there's an inability of the blood to carry oxygen.
- Intrauterine hypoxiawhich is an unchallenged cause of perinatal death
- Ischemic, or stagnant hypoxiain which blood flow to the tissues is not adequate.
- Histotoxic hypoxiain which quantity of oxygen reaching the cells is normal, but the cells are unable to effectively use the oxygen.
See also
- Asphyxia
- Drowning
- Hypoxic tumor
- Hyperoxia
- Time of Useful Consciousnessda:Hypoxia
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Categories: Articles to be merged| Pulmonology| Diving medicine| Aviation medicine
This article is licensed under the GNU Free Documentation License. It uses material from the http://en.wikipedia.org/wiki/Hypoxia+%28medical%29 Wikipedia article Hypoxia (medical).
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