Abstract：Objective To investigate the value of blood lactic acid (BLA) in evaluating disease severity and prognosis in children with sepsis. Methods A total of 484 children with sepsis were enrolled and divided into common sepsis group (n = 310), severe sepsis group (n = 105), and septic shock group (n = 69). BLA level was measured before treatment, and the results of BLA re-examination after early fluid resuscitation were collected for children with septic shock and a BLA level of >2 mmol/L. Results The BLA level increased with the increasing severity of sepsis. The analysis of the receiver operating characteristic curve showed that the cut-off value of BLA for the diagnosis of septic shock was 2.25 mmol/L, with a sensitivity of 82.6% and a specificity of 79.8%. The fatality rates in the BLA ≤1 mmol/L, BLA 1.1-2 mmol/L, BLA 2.1-4 mmol/L, and BLA >4 mmol/L groups were 8.5%, 9.4%, 27.2%, and 67.6%, respectively, and the risk of death in the BLA >4 mmol/L group was 22.4 times that in the BLA ≤1 mmol/L group. In children with septic shock who had a BLA level of >2 mmol/L before treatment and whose BLA levels were ≤2 mmol/L or >2 mmol/L
after resuscitation, the fatality rates were 33.3% and 69.2%, respectively. Conclusions BLA can be used to evaluate disease severity and prognosis in children with sepsis, and a BLA level of 2.25 mmol/L has a high value in diagnosing septic shock. Early resuscitation helps BLA level return to normal and can improve the prognosis of children with septic shock.
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