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Figure 6 End-tidal CO₂ pressure (PETCO₂) and arterial PCO₂ (PaCO₂) at rest and during exercise in 53 cardiac patients and 15 normal control subjects. There was a significant difference in the change between PaCO₂ and PETCO₂ variables and interaction with time in both the patients (variables p = 0.0001, interaction p = 0.0001, by ANOVA) and control subjects (variables p = 0.0001, interaction p = 0.0001, by ANOVA). Peak indicates peak exercise. Values are mean ± SE. *; p < 0.05 versus normal controls. ; p < 0.05 versus PaCO₂.

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