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Blood gases and ventilatory efficiency

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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The arterial partial pressure of carbon dioxide, PaCO2 reflects alveolar ventilation and in most cases may be used as an index of ventilatory efficiency.

It is raised i.e. greater than 6.5 kPa, with hypoventilation and decreased i.e. less than 4.5 kPa, during hyperventilation.

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