alveolar-arterial oxygen difference

al·ve·o·lar-·ar·te·ri·al ox·y·gen dif·fer·ence

the difference or gradient between the partial pressure of oxygen in the alveolar spaces and the arterial blood: P(A-a)02. Normally in young adults this value is less than 20 mm Hg.
See also: alveolar gas equation.

al·ve·o·lar-ar·te·ri·al ox·y·gen dif·fer·ence

(al-vē'ŏ-lăr-ahr-tēr'ē-ăl ok'si-jĕn dif'ĕr-ĕns)
The gradient between the partial pressure of oxygen in the alveolar spaces and the arterial blood: P(A-a)02. Normally, in young adults this value is less than 20 mmHg.
References in periodicals archive ?
in another meta-analysis compared PCV and VCV in 1643 patients in different positions (supine, lateral and prone)and conditions (one lung ventilation and laparoscopy) and showed that VCV is associated with decreased oxygenation index and increased alveolar-arterial oxygen difference.
The elevated alveolar-arterial oxygen difference demonstrates increased physiological shunting superimposed on chronic hypoventilation.
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