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Cyanosis: Differentiation 1212.e1
Cyanosis: Differentiation
VetBooks.ir SaO 2 PaO 2 PaCO 2 * PaO 2
Problem Room Air* Room Air* Room Air* Response to 100% O 2
Peripheral cyanosis Normal † Normal † Normal (−)
Right-to-left intracardiac shunt ↓↓ ↓↓ Normal (−)
Pulmonary parenchymal disease ↓↓ ↓↓ ↑ ↑
Hypoventilation ↓ ↓ ↑↑ ↑
Systemic hypoperfusion ↓ ↓ Normal/↑ ↑
Ventilation/perfusion mismatch ↓ ↓ Normal/↓ ↑
Methemoglobinemia ↓ Normal Normal (−)
*Normal SaO 2 (room air) = ≈97%; normal PaO 2 (room air) = ≈100 mm Hg; normal PaCO 2 (room air) = ≈40 mm Hg.
† Unless blood drawn from affected area.
↓, Decreased; ↓↓, markedly decreased; ↑, increased; ↑↑, markedly increased; (−), no response.
From Ettinger S, Feldman E: Textbook of veterinary internal medicine, ed 5, St. Louis, 2000, Saunders.
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