that the alveolar and arterial partial pressures are equal Carbon dioxide (CO 2) in the alveolar gas is in equilibrium with the arterial blood i.e.Inspired and alveolar gases obey the ideal gas law.Nitrogen (and any other gases except oxygen) in the inspired gas are in equilibrium with their dissolved states in the blood.Inspired gas contains no carbon dioxide (CO 2).The equation relies on the following assumptions: The alveolar gas equation allows the calculation of the alveolar partial pressure of oxygen from data that is practically measurable. However, it is not practical to take a sample of gas from the alveoli in order to directly measure the partial pressure of oxygen. The partial pressure of oxygen (pO 2) in the pulmonary alveoli is required to calculate both the alveolar-arterial gradient of oxygen and the amount of right-to-left cardiac shunt, which are both clinically useful quantities. The alveolar air equation is not widely used in clinical medicine, probably because of the complicated appearance of its classic forms. The equation is used in assessing if the lungs are properly transferring oxygen into the blood. The alveolar gas equation is the method for calculating partial pressure of alveolar oxygen (P AO 2).
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