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Published on: May 23, 2015
Elevated NT-proBNP levels should be interpreted in elderly patients presenting with dyspnea
Fabio Fabbian1, Alfredo De Giorgi, Marco Pala
1Department of Clinical and Experimental Medicine, University Hospital St. Anna, Corso Giovecca, 203, I-44100 Ferrara, Italy. f.fabbian@ospfe.it
In elderly patients with dyspnea, NT-proBNP levels are often elevated and influenced by factors beyond congestive heart failure, such as kidney disease and anemia. These findings suggest NT-proBNP may not reliably diagnose heart failure in this complex population.
Area of Science:
- Geriatric Medicine
- Cardiology
- Nephrology
Background:
- B-type natriuretic peptide (BNP) assays are standard for diagnosing dyspnea from congestive heart failure (CHF).
- However, numerous conditions can alter BNP levels, complicating its interpretation.
- This study focused on elderly patients presenting with dyspnea in an internal medicine setting.
Purpose of the Study:
- To investigate the factors influencing N-terminal pro-B-type natriuretic peptide (NT-proBNP) levels in elderly patients admitted for dyspnea.
- To assess the diagnostic utility of NT-proBNP in the presence of comorbidities.
Main Methods:
- NT-proBNP was measured in 132 elderly patients (mean age 80 years) presenting with dyspnea.
- Clinical, biochemical, and renal function parameters were collected; pulmonary diseases were analyzed.
- Statistical analysis compared patients with high NT-proBNP versus normal levels using the Januzzi cut-off.
Main Results:
- Elevated NT-proBNP levels (>normal reference) were observed in 68.7% of patients.
- NT-proBNP levels correlated with chronic kidney disease stages, lower hemoglobin, and higher prevalence of atrial fibrillation.
- Logistic regression identified hemoglobin and pulmonary diseases as independent predictors of NT-proBNP levels.
Conclusions:
- NT-proBNP plasma levels in elderly patients with dyspnea are significantly affected by conditions other than congestive heart failure.
- Pulmonary diseases and anemia independently influence NT-proBNP levels.
- NT-proBNP alone may not be sufficient for diagnosing dyspnea in elderly patients with multiple comorbidities.
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