A a Gradient

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A a Gradient

A measure of the difference between alveolar and arterial oxygen, which is equal to PAO2 - PaO2, and is a value of use in determining whether hypoxia is intrapulmonary or extrapulmonary.
References in periodicals archive ?
Arterial blood gas analysis revealed hypercapnic respiratory failure with normal alveolar-arterial gradient on room air (pH: 7.33, P[O.sub.2]: 65 mmHg, pC[O.sub.2]: 50 mmHg, HC[O.sub.3]: 26 mEq/L, PA[O.sub.2]-Pa[O.sub.2]: 10 mmHg).
Arterial blood gas on room air showed respiratory alkalosis with metabolic alkalosis, normal lactate, and normal alveolar-arterial gradient, adjusted for age.
Arterial blood gas analysis revealed an alveolar-arterial gradient of 15 mmHg, consistent with gas transfer defect.
Hepatopulmonary syndrome consists of a triad of hepatic dysfunction and/or portal hypertension, intrapulmonary vascular dilatations and hypoxemia/ widened alveolar-arterial gradient. (6)
His lactate dehydrogenase level was 245 [micro]/l(<201 [micro]/l), and arterial blood gas revealed an elevated alveolar-arterial gradient of 31 mmHg.
His alveolar-arterial gradient (A-a gradient) was 60 torr.
Arterial oxygenation and alveolar-arterial gradients in termpregnancy.
Mean alveolar gases and alveolar-arterial gradients in pulmonary patients.
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