Document Detail

Oxygen uptake efficiency slope correlates with brain natriuretic peptide in patients with heart failure.
MedLine Citation:
PMID:  20690091     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Cardiopulmonary exercise testing is a well-established tool for clinical and prognostic assessment of patients with chronic heart failure (CHF). Recently, a new parameter of this examination--oxygen uptake efficiency slope (OUES)--has been described and proposed as a new prognostic factor in patients with CHF. Brain natriuretic peptide (BNP) is an established prognostic factor in CHF. The purpose of the study was to assess OUES in patients with CHF in relation to other cardiopulmonary parameters and BNP levels.
METHODS: The study group consisted of 42 patients with CHF and left ventricular ejection fraction (LVEF) < 45% (mean age 50.2 +/- 9.3 years, mean ejection fraction 26.1 +/- 8.1% and NYHA functional class - 2.5 +/- 0.8) and eight healthy controls (age 43.6 +/- 14.7 years). Coronary artery disease was diagnosed in 16 patients (38%). All underwent maximal cardiopulmonary exercise treadmill test. BNP level was measured using Abbott AxSYM Immunoassay system.
RESULTS: There were significant (p < 0.001) differences between the patients and controls in BNP levels (350 +/- 520 vs 14 +/- 19 pg/mL), OUES (1.7 +/- 0.4 vs 2.7 +/- 0.5), peak VO(2) (17.1 +/- +/- 5.1 vs 36.9 +/- 4.9 mL/kg/min), O(2) pulse (10.9 +/- 3.3 vs 15.9 +/- 2.7) and VE/VCO(2) slope (35.7 +/- 7.8 vs 25.7 +/- 2.7). In patients, OUES was significantly (p < 0.001) correlated with LVEF (r = 0.54), BNP levels (r = -0.49), peak VO(2) (r = 0.80), VO(2) AT (r = 0.65) and VE/VCO(2) slope (r = -0.59). BNP was independently related to OUES in multivariate regression analysis.
CONCLUSIONS: Oxygen uptake efficiency slope is significantly reduced in patients with CHF and correlates with peak VO(2) and other parameters of cardiopulmonary exercise treadmill test. It is not related to age. BNP is an independent marker of OUES in patients with CHF.
Ewa Straburzyńska-Migaj; Adrian Gwizdała; Andrzej Siniawski; Romuald Ochotny; Stefan Grajek
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Cardiology journal     Volume:  17     ISSN:  1897-5593     ISO Abbreviation:  Cardiol J     Publication Date:  2010  
Date Detail:
Created Date:  2010-08-06     Completed Date:  2010-11-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101392712     Medline TA:  Cardiol J     Country:  Poland    
Other Details:
Languages:  eng     Pagination:  362-6     Citation Subset:  IM    
1st Department of Cardiology, University School of Medical Sciences, Długa 1/2, Poznań, Poland.
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MeSH Terms
Biological Markers / blood
Case-Control Studies
Chi-Square Distribution
Chronic Disease
Exercise Test*
Exercise Tolerance*
Heart Failure / blood,  diagnosis*,  physiopathology
Middle Aged
Multivariate Analysis
Natriuretic Peptide, Brain / blood*
Oxygen / metabolism*
Oxygen Consumption*
Predictive Value of Tests
Pulmonary Ventilation
Regression Analysis
Stroke Volume
Ventricular Function, Left
Reg. No./Substance:
0/Biological Markers; 114471-18-0/Natriuretic Peptide, Brain; 7782-44-7/Oxygen

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