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Correlation analysis. (A,B) Lactate and threonine were positively correlated with PVR; (C–E) Lactate and threonine were positively correlated with NT−proBNP, while alanine was negatively correlated with NT−proBNP; (F,G) Lactate and threonine were negatively correlated with Cp; (H) Lactate was negatively correlated with SaO2.
