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.
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The diagnostic criteria for HPS are: "Partial oxygen pressure < 80 mmHg or oxygen alveolar-arterial gradient [greater than or equal to] 15 mmHg while breathing room air, positive findings in the contrast, portal hypertension (more common) with or without cirrhosis.
Hepatopulmonary syndrome consists of a triad of hepatic dysfunction and/or portal hypertension, intrapulmonary vascular dilatations and hypoxemia/ widened alveolar-arterial gradient.
His lactate dehydrogenase level was 245 [micro]/l(<201 [micro]/l), and arterial blood gas revealed an elevated alveolar-arterial gradient of 31 mmHg.
13) Patients presenting with hypoxia, defined as partial pressure of arterial oxygen less than 70 mm Hg breathing room air, or alveolar-arterial gradient greater than 35 benefit from corticosteroid therapy.
Arterial oxygenation and alveolar-arterial gradients in termpregnancy.
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