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The relationship between VCO2A and PACO2 is linear. The slope of this line is proportional to the pulmonary blood flow. An intersecting line can be drawn from the origin following the relationship VA = VCO2 × PACO2/713. The steady state point (A) for PACO2 and VCO2A is produced by the balance of CO2 diffusion into the alveoli and the flow of blood into the pulmonary capillaries.
