alveolar air

The nitrogen concentration in the blood and the alveolar air is about the same.

Several possible equations exist to calculate the alveolar air.

The fluid coating is produced by the body in order to facilitate the transfer of gases between blood and alveolar air.

The alveolar air equation is not widely used in clinical medicine, probably because of the complicated appearance of its classic forms.

The alveolar air equation is the following formula, used to calculate the partial pressure of alveolar gas:

The oxygen contained in the alveolar air is directly proportional to its fractional composition in air.

Just as dead space wastes a fraction of the inhaled breath, dead space dilutes alveolar air during exhalation.

(2) Pulmonary barotrauma : extra alveolar air noted as pneumothorax, pneumomediastinum, subcutaneous emphysema or pneumoperitoneum.

When such blood is added to blood from well ventilated alveoli, the mix has a lower oxygen partial pressure than the alveolar air, and so the A-a difference develops.

End expiratory breath samples were collected at baseline before intake of the meal and then every 15 minutes for up to five hours using a commercially available double bag designed to collect alveolar air.

Likewise, because the concentration of carbon dioxide is higher in the blood that's entering the capillaries than it is in the alveolar air, carbon dioxide passes from the blood to the alveoli.

It expresses the fact that the concentration of an inert gas in the alveolar air depends on the mixed venous concentration , the substance-specific blood:air partition coefficient , and the ventilation-perfusion ratio .

The nitrogen concentration is initially zero because the subject is exhaling the dead space oxygen they just breathed in (does not participate in alveolar exchange), and climbs as alveolar air mixes with the dead space air.

The American Medical Association concludes in its Manual for Chemical Tests for Intoxication (1959): "True reactions with alcohol in expired breath from sources other than the alveolar air (eructation, regurgitation, vomiting) will, of course, vitiate the breath alcohol results."