Purpose: Occult hypoperfusion is associated with increased mortality in patients with sepsis. We sought to determine the practice patterns and outcomes of patients with sepsis-related occult hypoperfusion and introduce a potential method for risk stratification.
Materials and methods: Single-center retrospective study of normotensive patients presenting to an urban tertiary care emergency department with lactate greater than or equal to 4 mmol/L and suspected infection. χ(2) Testing, Spearman, and Wilcoxon coefficients were used to compare binary, parametric, and nonparametric data, respectively. Patients were divided into 4 groups based on lactate clearance (<4 mmol/L) and the presence of respiratory distress while in the emergency department; outcomes were compared using χ(2) test and analysis of variance.
Results: Median initial lactate was 4.7 mmol/L (interquartile range, 4.2-6.4), and 34 (45.2%) of 73 exhibited respiratory distress. Hyperlactatemia resolved in 67.1% (49/73) of patients. Mortality was 23.3% (17/73), and 19.1% (14/73) required vasopressors. In patients with lactate clearance and without respiratory distress (n = 27), mortality was 0%, and none required vasopressors. In patients with persistent hyperlactatemia and/or respiratory distress (n = 46), 30.4% required vasopressors, and the mortality was 37.0% (P < .01 and P < .01, respectively).
Conclusions: Patients defined as having occult hypoperfusion comprise a heterogeneous group with a varied degree of illness severity. Identifying those with low risk of clinical deterioration may be important for titration of care.
Keywords: Lactate clearance; Mortality; Occult hypoperfusion; Sepsis; Vasopressor.
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