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Scatter plot between cardiac index and mixed venous-to-arterial carbon dioxide difference. All patients at Time 0 (T0) and 6 hours (T6), 12 hours (T12) and 24 hours (T24) later. Pearson correlation: 0.16; r2 = 0.025; P <0.01. CI, confidence interval; Pv-aCO2, mixed venous-to-arterial carbon dioxide difference.
