Persistent hyperlactatemia-high central venous-arterial carbon dioxide to arterial-venous oxygen content ratio is associated with poor outcomes in early resuscitation of septic shock

Abstract Objective Several studies reported Pv-aCO 2 /Ca-vO 2 ratio as a surrogate of VCO 2 /VO 2 to detect global tissue hypoxia. The present study aimed to evaluate the prognostic value of Pv-aCO 2 /Ca-vO 2 ratio combined with lactate levels during the early phases of resuscitation in septic shock. Methods A retrospective study was conducted in 144 septic shock patients in a 30-bed mixed ICU. A Pv-aCO 2 /Ca-vO 2 ratio>1.4 was considered abnormal. Patients were classified into four predefined groups according to lactate levels and Pv-aCO 2 /Ca-vO 2 ratio after the first 6h of resuscitation. Sequential Organ Failure Assessment (SOFA) score at day 3 was assessed. A Kaplan-Meier curve showed the survival probabilities at day 28 using a log-rank test to evaluate the differences between groups. A receiver operating characteristics (ROC) curve evaluated the ability of lactate, Pv-aCO 2 /Ca-vO 2 ratio and Pv-aCO 2 /Ca-vO 2 ratio combined with lactate to predict mortality at day 28. Results Combination of hyperlactatemia and high Pv-aCO 2 /Ca-vO 2 ratio was associated with poor SOFA scores and low survival rates at day 28 ( P 2 /Ca-vO 2 ratio and lactate at T6 were independent predictors of mortality at day 28. The area under the ROC curve of the Pv-aCO 2 /Ca-vO 2 ratio combined with lactate for predicting mortality at day 28 was highest and superior to that of lactate and Pv-aCO 2 /Ca-vO 2 ratios. Conclusion Combination of Pv-aCO 2 /Ca-vO 2 ratio and lactate at early stages of resuscitation of septic shock can better predict the prognosis of patients. The Pv-aCO 2 /Ca-vO 2 ratio may become a useful parameter supplementary to lactate in the resuscitation of septic shock.