CLINICAL RESEARCH: HEART FAILURE
Brain natriuretic peptide and n-terminal brain natriuretic peptide in the diagnosis of heart failure in patients with acute shortness of breath
John G. Lainchbury, MD*,*,
Elizabeth Campbell, BSc (Hons)*,
Christopher M. Frampton, PhD*,
Timothy G. Yandle, PhD*,
M. Gary Nicholls, MD, FACC* and
A. Mark Richards, MD, PhD*
* Department of Medicine, Christchurch School of Medicine, University of Otago, Christchurch, New Zealand
Manuscript received February 4, 2003;
revised manuscript received March 27, 2003,
accepted May 12, 2003.
* Reprint requests and correspondence: Dr. John G. Lainchbury, Department of Medicine, Christchurch Hospital, Riccarton Avenue, P. O. Box 4345, Christchurch, New Zealand. john.lainchbury{at}chmeds.ac.nz
OBJECTIVES: This study sought to compare the utility of measurement of plasma brain natriuretic peptide (BNP) and N-terminal brain natriuretic peptide (N-BNP) in the diagnosis of heart failure (HF) in patients with acute dyspnea.
BACKGROUND: Plasma BNP is useful in differentiating HF from other causes of dyspnea in the emergency department. The N-terminal component of BNP has a longer half-life, and in HF increases in plasma N-BNP are proportionately greater.
METHODS: We studied 205 patients (average age 70 ± 14 years) presenting to the emergency department with acute dyspnea. Brain natriuretic peptide was analyzed using a point-of-care test and two locally developed radioimmunoassays. N-terminal BNP was measured using a locally developed radioimmunoassay and a commercially available assay. Final diagnosis of HF was adjudicated by two cardiologists.
RESULTS: Patients with HF (n = 70) had higher mean levels of both hormones by all assays (p < 0.001 for all). Results with all assays correlated closely (r values between 0.902 and 0.969). Subjects with left ventricular (LV) dysfunction or left-sided valvular disease but no HF had intermediate levels of BNP and N-BNP (lower than subjects with HF, and higher than subjects without HF with no LV dysfunction or left-sided valvular disease) (p < 0.01 for all). Using optimum cut-offs, specificity for the diagnosis of HF ranged between 70% and 89% (highest for the N-BNP assays). Sensitivity ranged between 80% and 94% (highest for the point-of-care BNP assay).
CONCLUSIONS: Measurement of BNP or N-BNP is useful in the diagnosis of HF in acute dyspnea. Commercially available assays compare favorably with well-validated laboratory assays. Differences in sensitivity and specificity may influence the assay choice in this setting.
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Abbreviations and Acronyms
| | BNP | | brain natriuretic peptide | | CNP | | C-type natriuretic peptide | | HF | | heart failure | | LV | | left ventricular | | N-BNP | | N-terminal brain natriuretic peptide |
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