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The Repex (repetitive exposure) method, developed in 1988, allows oxygen toxicity dosage to be calculated using a single dose value equivalent to 1 minute of 100% oxygen at atmospheric pressure called an Oxygen Tolerance Unit (OTU), and is used to avoid toxic effects over several days of operational exposure.
Oxalic acid has an oral LD Lo (lowest published lethal dose) of 600 mg/kg. [65] It has been reported that the lethal oral dose is 15 to 30 grams. [66] The toxicity of oxalic acid is due to kidney failure caused by precipitation of solid calcium oxalate. [67] Oxalate is known to cause mitochondrial dysfunction. [68]
The maximum benefit of oxygen availability is a balance between necessity and toxicity along a continuum. [1] Cumulative oxygen dose is determined by a combination of exposure time, ambient pressure, and the oxygen fraction of the inhaled gas. The latter two factors can be combined as the partial pressure of inhaled oxygen in the alveoli.
In toxicology, the lethal dose (LD) is an indication of the lethal toxicity of a given substance or type of radiation. Because resistance varies from one individual to another, the "lethal dose" represents a dose (usually recorded as dose per kilogram of subject body weight) at which a given percentage of subjects will die.
The diagram above can also be used as an alternative way to convert any substance concentration (not only the normal or optimal ones) from molar to mass units and vice versa for those substances appearing in both scales, by measuring how much they are horizontally displaced from one another (representing the molar mass for that substance), and ...
An arterial blood gas (ABG) test, or arterial blood gas analysis (ABGA) measures the amounts of arterial gases, such as oxygen and carbon dioxide.An ABG test requires that a small volume of blood be drawn from the radial artery with a syringe and a thin needle, [1] but sometimes the femoral artery in the groin or another site is used.
Threshold dose is the minimum dose of drug that triggers minimal detectable biological effect in an animal. [1] At extremely low doses, biological responses are absent for some of the drugs. The increase in dose above threshold dose induces an increase in the percentage of biological responses. [ 2 ]
The consequence of oxygen deprivation in tissues is a switch to anaerobic metabolism at the cellular level. As such, reduced systemic blood flow may result in increased serum lactate. [80] Serum lactate levels have been correlated with illness severity and mortality in critically ill adults and in ventilated neonates with respiratory distress. [80]