Objective:To evaluate the prognostic value of thromboelastography maximum amplitude(MA)and arterial blood lactate levels for sepsis in elderly patients.Methods:A retrospective analysis was performed on clinical data of 63 sepsis patients(≥60 years old)admitted to the Intensive Care Unit(ICU)of Bethune Hospital of Shanxi Province from December 2018 to February 2020.MA values, white blood cell counts, lymphocyte counts, platelets, acute physiology and chronic health evaluation Ⅱ(APACHE Ⅱ)scores, sequential organ failure assessment(SOFA)scores, underlying diseases, body mass index, laboratory test results and other related treatments were analyzed.The subjects were divided into the survival group and the death group according to the 28-day survival outcome.Differences in MA, APACHE Ⅱ scores, SOFA scores and laboratory test results between the two groups were analyzed, and the correlations of MA with infection parameters and age were examined.Influencing factors of survival outcomes were analyzed using multivariate Logistic regression.The receiver operating characteristic curve(ROC)was used to calculate the prognostic value of MA and arterial lactate for sepsis in elderly patients.Results:The main sources of infections were pulmonary and abdominal(79.4%, 50/63)in 63 elderly patients with sepsis.The incidences of positive blood cultures and deaths were 15.9%(10/63)and 66.7%(42/63), respectively.There existed significant differences in lymphocyte counts, arterial lactate levels, MA and lengths of stay in the ICU between the survival group and the death group( t=3.847, 2.153, 2.745, -3.574, respectively, all P<0.05).MA was correlated with arterial lactate, SOFA score and survival outcome( r=-0.498, -0.506, and -0.358, respectively, all P<0.05).Multivariate Logistic regression analysis showed that MA and arterial lactate were independent factors for the survival outcome( OR=1.626, 0.766, all P<0.05).The area under the ROC curve(AUC, 95% CI)for the combination of MA and arterial lactate was larger than that of either MA or arterial lactate alone(0.89, range: 0.763-0.846; 0.58, range: 0.574-0.730; 0.77, range: 0.521-0.832; all P<0.05). Conclusions:The combination of thromboelastography maximum amplitude and lactate in arterial blood has important clinical value in assessing the prognosis of elderly patients with sepsis.