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Amino-terminal pro-brain natriuretic peptide as a predictor of outcome in patients admitted to intensive care. A prospective observational study
Linköping University, Department of Medicine and Care, Anaesthesiology. Linköping University, Department of Medical and Health Sciences. Linköping University, Faculty of Health Sciences.
Linköping University, Department of Clinical and Experimental Medicine, Occupational and Environmental Medicine. Linköping University, Faculty of Health Sciences.
Linköping University, Department of Medical and Health Sciences, Anesthesiology. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Anaesthetics, Operations and Specialty Surgery Center, Department of Anaesthesiology and Intensive Care in Norrköping.
2012 (English)In: European Journal of Anaesthesiology, ISSN 0265-0215, E-ISSN 1365-2346, Vol. 29, no 6, 275-279 p.Article in journal (Refereed) Published
Abstract [en]

Context: Amino-terminal pro-brain-type natriuretic peptide is known to predict outcome in patients with heart failure, but its role in an intensive care setting is not yet fully established. Objective: To assess the incidence of elevated amino-terminal pro-brain natriuretic peptide (NT-pro-BNP) on admission to intensive care and its relation to death in the ICU and within 30 days. Design: Prospective, observational cohort study. Setting: A mixed noncardiothoracic tertiary ICU in Sweden. Patients and main outcome measures NT-pro-BNP was collected from 481 consecutive patients on admission to intensive care, in addition to data on patient characteristics and outcome. A receiver-operating characteristic curve was used to identify a discriminatory level of significance, a stepwise logistic regression analysis to correct for other clinical factors and a Kaplan-Meier analysis to assess survival. The correlation between Simplified Acute Physiology Score (SAPS) 3, Sequential Organ Failure Assessment score (SOFA) and NT-pro-BNP was analysed using Spearmans correlation test. Quartiles of NT-pro-BNP elevation were compared for baseline data and outcome using a logistic regression model. Results: An NT-pro-BNP more than 1380 ng l(-1) on admission was an independent predictor of death in the ICU and within 30 days [odds ratio (OR) 2.6; 95% confidence interval (CI), 1.5 to 4.4] and was present in 44% of patients. Thirty-three percent of patients with NT-pro-BNP more than 1380 ng l(-1), and 14.6% of patients below that threshold died within 30 days (log rank P 0.005). NT-pro-BNP correlated moderately with SAPS 3 and with SOFA on admission (Spearmans rho 0.5552 and 0.5129, respectively). In quartiles of NT-pro-BNP elevation on admission, severity of illness and mortality increased significantly (30-day mortality 36.1%; OR 3.9; 95% CI, 2.0 to 7.3 in the quartile with the highest values, vs. 12.8% in the lowest quartile). Conclusion: We conclude that NT-pro-BNP is commonly elevated on admission to intensive care, that it increases with severity of illness and that it is an independent predictor of mortality.

Place, publisher, year, edition, pages
Lippincott, Williams and Wilkins / Wiley-Blackwell , 2012. Vol. 29, no 6, 275-279 p.
Keyword [en]
brain natriuretic peptide, intensive care, survival rate
National Category
Medical and Health Sciences
URN: urn:nbn:se:liu:diva-78569DOI: 10.1097/EJA.0b013e32835470a8ISI: 000304436100005OAI: diva2:534176
Available from: 2012-06-15 Created: 2012-06-15 Last updated: 2015-11-20Bibliographically approved
In thesis
1. Cardiac dysfunction in septic shock: Observational studies on characteristics and outcome
Open this publication in new window or tab >>Cardiac dysfunction in septic shock: Observational studies on characteristics and outcome
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Background: Cardiac dysfunction is a well-known complication of sepsis, but its characteristics and consequences, especially on a longer term, remain unclear. The aim of this thesis was to study the characteristics and the implications of cardiac dysfunction for outcome in intensive care unit (ICU) patients with septic shock.

Purpose: First, to assess the ability of a cardiac biomarker to predict outcome in ICU patients. Second, to characterise cardiac dysfunction in septic shock using speckle tracking echocardiography. Third, to investigate the reliability of echocardiographic methods used to describe cardiac dysfunction in septic shock. Fourth, to study long-term cardiac outcome in severe sepsis and septic shock patients.

Materials and methods: The cardiac biomarker amino-terminal pro-brain natriuretic peptide (NTproBNP) was collected in 481 patients on ICU admission and its ability to predict death was assessed. In 50 patients with septic shock, echocardiography was performed on ICU admission and was repeated during and after ICU stay. Measurements of cardiac strain using speckle tracking echocardiography were assessed in relation to other echocardiographic function parameters, NT-proBNP and severity of illness scores, and their change over time was analysed. Echocardiograms from patients with septic shock were independently evaluated by two physicians and the results analysed regarding measurement variability. A nationwide-registry-based open cohort of 9,520 severe sepsis and septic shock ICU patients discharged alive from the ICU was analysed together with a non-septic control group matched for age, sex and severity of illness. In patients who died after ICU discharge, information on causes of death was collected.

Results: A discriminatory level of significance of NT-proBNP on ICU admission was identified at ≥1,380 ng/L, above which NT-proBNP was an independent predictor of death. With increasing levels of NT-proBNP, patients were more severely ill, had a longer ICU stay and were more often admitted with septic shock. Cardiac strain was frequently impaired in septic shock patients but was not superior to other echocardiographic measurements in detecting cardiac dysfunction. Cardiac strain correlated with other echocardiographic function parameters and with NT-proBNP, and was the least user-dependent echocardiographic parameter in septic shock patients. Cardiac strain remained unchanged over time, did not differ between survivors and non-survivors and could not predict an increased risk of death. During a follow-up of up to nearly 6 years after ICU discharge, 3,954 (42%) of sepsis patients died, 654 (17%) with cardiac failure as the cause of death. With increasing severity of illness on admission, the risk of death with cardiac failure as the cause of death after ICU discharge increased. In comparison to other ICU patients with similar severity of illness, however, the risk of death due to cardiac was not increased in patients with severe sepsis or septic shock.

Conclusions: Laboratory or echocardiographic signs of cardiac dysfunction are commonly seen in ICU patients in general and in septic shock patients in particular. The assessment of cardiac dysfunction in patients with septic shock is, however, complicated by pre-existing comorbidities, by treatment given in the ICU and by critical illness in itself. Signs of cardiac dysfunction, and the increasing risk of death related to cardiac failure seen after remission of sepsis, may therefore be reflections of critical illness per se, rather than of sepsis.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2015. 50 p.
Linköping University Medical Dissertations, ISSN 0345-0082 ; 1485
National Category
Anesthesiology and Intensive Care Cardiac and Cardiovascular Systems Clinical Medicine
urn:nbn:se:liu:diva-122759 (URN)10.3384/diss.diva-122759 (DOI)978-91-7685-938-4 (print) (ISBN)
Public defence
2016-01-22, Berzeliussalen, Campus US, Linköping, 09:00 (Swedish)
Available from: 2015-11-20 Created: 2015-11-20 Last updated: 2015-11-23Bibliographically approved

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De Geer, LinaFredrikson, MatsOscarsson Tibblin, Anna
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AnaesthesiologyDepartment of Medical and Health SciencesFaculty of Health SciencesOccupational and Environmental MedicineAnesthesiologyDepartment of Anaesthesiology and Intensive Care in Norrköping
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European Journal of Anaesthesiology
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