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Liquid breathing
Liquid breathing is a form of respiration in which a normally air-breathing organism breathes an oxygen-rich liquid (such as a perfluorocarbon), rather than breathing air.
Perfluorochemical (perfluorocarbon) molecules have very different structures that impart different physical properties such as respiratory gas solubility, density, viscosity, vapor pressure, and lipid solubility. Thus, it is critical to choose the appropriate PFC for a specific biomedical application, such as liquid ventilation, drug delivery or blood substitutes. The physical properties of PFC liquids vary substantially; however, the one common property is their high solubility for respiratory gases. In fact, these liquids carry more oxygen and carbon dioxide than blood.
In theory, liquid breathing could assist in the treatment of patients with severe pulmonary or cardiac trauma, especially in pediatric cases. Liquid breathing has also been proposed for use in deep diving〔(【引用サイトリンク】title=menfish )〕 and space travel. Despite some recent advances in liquid ventilation, a standard mode of application has not been established yet.
==Approaches==
Because liquid breathing is still a highly experimental technique, there are several proposed approaches.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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