oxygen tension

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oxygen tension

the partial pressure of oxygen molecules dissolved in a liquid, such as blood plasma.


a chemical element, atomic number 8, atomic weight 15.999, symbol O. See Table 6. It is a colorless and odorless gas that makes up about 20% of the atmosphere. In combination with hydrogen, it forms water; by weight, 90% of water is oxygen. It is the most abundant of all the elements of nature. Large quantities of it are distributed throughout the solid matter of the earth, because the gas combines readily with many other elements. With carbon and hydrogen, oxygen forms the chemical basis of much organic material. Oxygen is essential in sustaining all kinds of life.

oxygen analyzer
an instrument that measures the concentration of oxygen in a gas mixture.
oxygen deficiency
significant cause of losses in cultivated finfish in enclosed dams, but also in rivers and estuaries, caused by lack of natural aeration of the water or to heavy algal blooms, bushfire ash deposits and overcast conditions leading to respiration rather than photosynthesis or a high concentration of organic matter and leading to the development of a bacterial bloom; a high temperature exacerbates the development.
oxygen flux equation
a calculation that determines the rate at which oxygen is made available to tissues, based on cardiac output and arterial oxygen content.
oxygen-hemoglobin dissociation curve
a graphic explanation of the release and acquisition of oxygen from and to the hemoglobin in the blood in varying circumstances of oxygen partial pressure in the environment.
oxygen regulator
see reducing valve.
oxygen saturation
the amount of oxygen bound to hemoglobin in the blood expressed as a percentage of the maximal binding capacity.
oxygen saturation curve
graphical representation describing the relationship (usually curvilinear) between fraction of oxygen-binding sites (of a protein) that have oxygen bound to them and the partial pressure (concentration) of free oxygen.
oxygen tank
the heavy metal cylinder in which medical gases are compressed at high pressure. Called also oxygen cylinder.
oxygen tension
see tension (2).
oxygen tent
an enclosed space or plastic canopy used for oxygen therapy, humidity therapy or aerosol therapy.
oxygen therapy
supplemental oxygen administered for the purpose of relieving hypoxemia and preventing damage to the tissue cells as a result of oxygen lack (hypoxia). Companion animals are usually placed in a special cage with oxygen piped to it. A mask is used for short-term administration. Large animals can be supplied by a nasal tube taped in place to deliver oxygen into the pharynx.
oxygen toxicity
tissue damage may occur with exposure to high concentrations of oxygen for long periods. See also retrolental fibroplasia.
oxygen-transfer chain
a functional chain describing the transfer of oxygen from the external environment to the metabolizing tissue; includes uptake in the respiratory system, binding to hemoglobin, transport through the circulatory system, diffusion and dissociation in tissues and utilization in mitochondria, i.e. oxidatable substrates and enzymes.
oxygen transport
process of transfer of oxygen around the body either attached to hemoglobin or myoglobin.
References in periodicals archive ?
A clinical study of the oxygen tension of the urine and renal structures.
The therapeutic potential of oxygen tension manipulation via hypoxia inducible factors and mimicking agents in guided bone regeneration.
Cartilage is in a permanent state of low oxygen tension in the body, so this tissue is not perfused.
Cohort study of transcutaneous oxygen tension and the incidence and severity of retinopathy of prematurity.
Clostridial gas gangrene infection occurs with tissue inoculation in a low oxygen tension environment.
Guidelines from the American Thoracic Society and British Thoracic Society (Thorax 2002;57:289-304) recommend that patients with chronic lung disease be able to maintain an arterial oxygen tension greater than 50 mm Hg or 6.
VHL is commonly lost in ccRCC, leading to a state of 'pseudohypoxia,' in which cellular processes activated during low oxygen tension become continuously active.
Therefore, once tissue oxygen tension decreases to 10 mm HG there is no angiogenesis, which leads to further oxygen deficiency, preventing tissue granulation and blocking tissue healing.
Hb S (Hb a2b2s) is insoluble and forms crystals when exposed to low oxygen tension.
The effect of upper gas-trointestinal endoscopy on arterial oxygen tension in smok-ers and nonsmokers with and without premedication.