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Lactate clearance as a simple bedside instrument to predict short-term mortality of severe septic patients
Critical Care volume 15, Article number: P43 (2011)
Severe sepsis is major health problem with a high mortality rate, and still its incidence continues to rise [1–5]. Lactate clearance, measurement of the lactate level at two consecutive times, is an inexpensive and simple clinical parameter that can be obtained by a minimally invasive means [6–8]. This parameter represents kinetic alteration of the anaerobic metabolism that makes it a potential parameter to evaluate disease severity and intervention adequacy. Lactate clearance early in the hospital course may indicate a resolution of global tissue hypoxia and is associated with improved outcome [7–9]. Nevertheless, the relationship between lactate clearance and short-term mortality in severe septic patients is still poorly understood. Understanding the presence of confounder factors is also important to strengthen the role of lactate clearance in the treatment of severe septic patients.
To evaluate the clinical course between lactate clearance groups, and determine the role of confounder variables that influence its relationship.
This is a prospective cohort study conducted in Ciptomangun-kusumo Hospital, from March to May 2011. Patients were categorized into the high lactate clearance group if there were differences in 6-hour lactate levels ≥10%, and conversely were categorized into the low lactate clearance group [7, 8]. Deaths were observed within the first 10 days. After data collection, the statistical methods were analyzed using survival analysis. Analysis of confounder variables was performed by multivariate Cox regression test.
During the research period there were 60 patients recruited, consisting of 30 patients grouped into high lactate clearance and the remainder grouped into low lactate clearance. The survival rates in high and low lactate clearance groups were 60.0% versus 26.7% (see Figure 1). In the low lactate clearance group the median survival was 3 days, while the mortality rate did not reach 50% in the high lactate clearance group. The first interquartile was 1 day and 4 days. The hazard ratio between groups was 2.87 (95% CI = 1.41 to 5.83). Steps taken to analyze the role of variables that potentially act as confounder factors were by using bivariate analysis, in which variables that influenced the occurrence of deaths (indicated by P < 0.25) underwent multivariate analysis subsequently. On multivariate analysis the presence of septic shock, degree of organ dysfunction, vasoactive drug usage, blood transfusion, and fluid resuscitation change the hazard ratio by no more than 10% (Table 1). For that reason, these parameters were not considered as confounders.
Severe septic patients with high lactate clearance have a better survival rate compared with the low lactate clearance group, and its relationship is not influenced by the presence of confounder variables.
Moss M: Epidemiology of sepsis: race, sex, and chronic alcohol abuse. Clin Infect Dis. 2005, 41 (Suppl 7): S490-S497.
Guidet B, Aegerter P, Gauzit R, Meshaka P, Dreyfuss D: Incidence and impact of organ dysfunctions associated with sepsis. Chest. 2005, 127: 942-951. 10.1378/chest.127.3.942.
O'brien JM, Ali NA, Abraham E: Year in review in critical care, 2004: sepsis and multi-organ failure. Crit Care. 2005, 9: 409-413. 10.1186/cc3728.
Ely EW, Kleinpell RM, Goyette RE: Advances in the understanding of clinical manifestations and therapy of severe sepsis: an update for critical care nurses. Am J Crit Care. 2003, 12: 120-133.
Angus DC, Linde-Zwirble WT, Lidicker J, Clermont G, Carcillo J, Pinsky MR: Epidemiology of severe sepsis in the united states: analysis of incidence, outcome, and associated costs of care. Crit Care Med. 2001, 29: 1303-1310. 10.1097/00003246-200107000-00002.
Nguyen HB, Loomba M, Yang JJ, Jacobsen G, Shah K, Otero RM, Suarez A, Parekh H, Jaehne A, Rivers EP: Early lactate clearance is associated with biomarkers of inflammation, coagulation, apoptosis, organ dysfunction and mortality in severe sepsis and septic shock. J Inflamm. 2010, 7: 6-17. 10.1186/1476-9255-7-6.
Nguyen HB, Rivers EP, Knoblich BP, Jacobsen G, Muzzin A, Ressler JA, Tomlanovich MC: Early lactate clearance is associated with improved outcome in severe sepsis & septic shock. Crit Care Med. 2004, 32: 1637-1642. 10.1097/01.CCM.0000132904.35713.A7.
Arnold RC, Shapiro NI, Jones AE, Schorr C, Pope J, Casner E, Parrillo JE, Dellinger P, Trzeciak S: Multicenter study of early lactate clearance as a determinant of survival in patients with presumed sepsis. Shock. 2009, 32: 35-39. 10.1097/SHK.0b013e3181971d47.
Jones AE, Shapiro NI, Trzeciak S, Arnold RC, Claremont HA, Kline JA: Lactate clearance vs central venous oxygen saturation as goals of early sepsis therapy. JAMA. 2010, 303: 739-746. 10.1001/jama.2010.158.
The authors thank the nurses and administrative staff in the Division of Tropical Medicine and Infectious Diseases, Department of Internal Medicine, Faculty Medicine, University of Indonesia for their assistance in this study.
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Hambali, W., Chen, K., Widodo, D. et al. Lactate clearance as a simple bedside instrument to predict short-term mortality of severe septic patients. Crit Care 15, P43 (2011). https://doi.org/10.1186/cc10412
- Severe Sepsis
- Confounder Variable
- Lactate Level
- Major Health Problem
- Vasoactive Drug