Factors affecting mixed venous CO2 tension

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NORMAL VALUES: PvCO2 45mmHg         CO2 content 52ml CO2/100ml blood

MEASUREMENT: sampled from a pulmonary artery catheter.

1. Alveolar ventilation

2. Increased CO2 production 

3. Carbonic anhydrase inhibitors i.e. acetazolamide

4. Tissue blood flow

5. Haldane Effect

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