Arterial blood gases

The blood gases in pulmonary arterial hypertension at rest show a normal or near-normal PaO2 but a low PaCO2 and a low HCO3-.  In pulmonary hypertension due to lung disease PaO2 at rest is frequently low.  Marked desaturation during exercise or at night is common in all forms of pulmonary hypertension.

 

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