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Intensive Care Medicine

, Volume 33, Issue 11, pp 1892–1899 | Cite as

Occult hypoperfusion and mortality in patients with suspected infection

  • Michael D. HowellEmail author
  • Michael Donnino
  • Peter Clardy
  • Daniel Talmor
  • Nathan I. Shapiro
Original

Abstract

Objective

To determine, in the early stages of suspected clinically significant infection, the independent relationship of the presenting venous lactate level to 28-day in-hospital mortality.

Design

Prospective, observational cohort study.

Setting

Urban, university tertiary-care hospital.

Patients

One thousand two hundred and eighty seven adults admitted through the emergency department who had clinically suspected infection and a lactate measurement.

Measurements and results

Seventy-three [5.7% (95% CI 4.4–6.9%)] patients died in the hospital within 28 days. Lactate level was strongly associated with 28-day in-hospital mortality in univariate analysis (p < 0.0001). When stratified by blood pressure, lactate remained associated with mortality (p < 0.0001). Normotensive patients with a lactate level ≥ 4.0 mmol/l had a mortality rate of 15.0% (6.0–24%). Patients with either septic shock or lactate ≥ 4.0 mmol/l had a mortality rate of 28.3% (21.3–35.3%), which was significantly higher than those who had neither [mortality of 2.5% (1.6–3.4%), p < 0.0001]. In a model controlling for age, blood pressure, malignancy, platelet count, and blood urea nitrogen level, lactate remained strongly associated with mortality. Patients with a lactate level of 2.5–4.0 mmol/l had adjusted odds of death of 2.2 (1.1–4.2); those with lactate ≥ 4.0 mmol/l had 7.1 (3.6–13.9) times the odds of death. The model had good discrimination (AUC = 0.87) and was well calibrated.

Conclusions

In patients admitted with clinically suspected infection, the venous lactate level predicts 28-day in-hospital mortality independent of blood pressure and adds significant prognostic information to that provided by other clinical predictors.

Keywords

Sepsis Infection Lactic acid/lactate Triage Prognosis Risk assessment 

Supplementary material

134_2007_680_MOESM1_ESM.doc (56 kb)
Electronic Supplementary Material (DOC 56K)

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Michael D. Howell
    • 1
    Email author
  • Michael Donnino
    • 2
  • Peter Clardy
    • 1
  • Daniel Talmor
    • 3
  • Nathan I. Shapiro
    • 2
  1. 1.Division of Pulmonary and Critical Care Medicine, Department of MedicineBeth Israel Deaconess Medical Center and Harvard Medical School, KB-23BostonUSA
  2. 2.Department of Emergency MedicineBeth Israel Deaconess Medical Center and Harvard Medical SchoolBostonUSA
  3. 3.Department of Anesthesia, Critical Care and Pain MedicineBeth Israel Deaconess Medical Center and Harvard Medical SchoolBostonUSA

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