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Brain natriuretic peptide and left ventricular dysfunction in chagasic cardiomyopathy
Andre Talvani1, Manoel O C Rocha, John Cogan
1Departamento de Bioquímica e Imunologia, Instituto Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, 31270-901, Belo Horizonte, MG, Brazil.
Memorias Do Instituto Oswaldo Cruz
|November 24, 2004
Summary
Brain natriuretic peptide (BNP) can effectively identify left ventricular (LV) systolic dysfunction in Chagas disease patients. Low BNP levels indicate a low likelihood of severe cardiac issues, potentially reducing the need for echocardiography.
Area of Science:
- Cardiology
- Infectious Diseases
- Biomarkers
Background:
- Global left ventricular (LV) systolic dysfunction is a key predictor of morbidity and mortality in Chagas disease.
- Echocardiography, the gold standard for LV dysfunction detection, is often unavailable in endemic regions.
- Brain natriuretic peptide (BNP) is a recognized marker for heart failure, offering a simpler diagnostic approach.
Purpose of the Study:
- To evaluate the utility of BNP as a diagnostic marker for LV systolic dysfunction in Chagas disease.
- To assess the correlation between BNP levels and echocardiographic findings in chagasic patients.
- To determine the prognostic value of BNP in identifying patients at risk for cardiac complications.
Main Methods:
- Prospective recruitment of 63 Chagasic patients and 18 healthy controls.
- Clinical examination, echocardiography, and 24-h Holter monitoring.
- Plasma BNP measurement using the Triage BNP test.
Main Results:
- Elevated BNP levels correlated with depressed LV ejection fraction, increased LV end-diastolic diameter, and LV premature complexes.
- A BNP concentration of ≥60 pg/ml demonstrated 91.7% sensitivity and 82.8% specificity for detecting LV dysfunction (LV ejection fraction < 40%).
- High negative predictive value (98%) suggests low risk of severe cardiac involvement with low BNP levels.
Conclusions:
- BNP measurement is a promising, cost-effective tool for identifying LV dysfunction in chagasic cardiomyopathy.
- Low plasma BNP levels in Trypanosoma cruzi infected individuals indicate a very low likelihood of severe cardiac involvement.
- BNP testing may help triage patients, potentially reducing the need for echocardiography in certain cases.