NT-proBNP for Risk Assessment in Patients with Atrial Fibrillation: Insights from the ARISTOTLE trial.

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NT-proBNP for Risk Assessment in Patients with Atrial Fibrillation: Insights from the ARISTOTLE trial.

J Am Coll Cardiol. 2013 Apr 3;

Authors: Hijazi Z, Wallentin L, Siegbahn A, Andersson U, Christersson C, Ezekowitz J, Gersh BJ, Hanna M, Hohnloser S, Horowitz J, Huber K, Hylek EM, Lopes RD, McMurray JJ, Granger CB

Abstract
OBJECTIVE: To assess the prognostic value of N-terminal pro-B-type natriuretic peptide (NT-proBNP) in patients with atrial fibrillation (AF) enrolled in the ARISTOTLE trial, and the treatment effect of apixaban according to NT-proBNP levels. BACKGROUND: Natriuretic peptides are associated with mortality and cardiovascular events in several cardiac diseases. METHODS: In the ARISTOTLE trial, 18,201 patients with AF were randomized to apixaban or warfarin. Plasma samples at randomization were available from 14,892 patients. The association between NT-proBNP concentrations and clinical outcomes was evaluated using Cox proportional hazard models, after adjusting for established cardiovascular risk factors. RESULTS: Quartiles of NT-proBNP were Q1:≤363, Q2:364-713, Q3:714-1250 and Q4:>1250 ng/L. During 1.8 years the annual rates of stroke or systemic embolism ranged from 0.74% in the bottom NT-proBNP quartile to 2.21% in the top quartile, adjusted hazard ratio (HR) 2.35 (95% CI 1.62-3.40, p<0.0001. Annual rates of cardiac death ranged from 0.86% in Q1 to 4.14% in Q4, adjusted HR 2.50 (1.81-3.45), p<0.0001. Adding NT-proBNP levels to the CHA2DS2VASc score improved C-statistics from 0.62 to 0.65 (p=0.0009) for stroke or systemic embolism and from 0.59 to 0.69 for cardiac death (p<0.0001). Apixaban reduced stroke, mortality, and bleeding regardless of the NT-proBNP level. CONCLUSIONS: Levels of NT-proBNP are often elevated in AF and independently associated with an increased risk for stroke and mortality. NT-proBNP improves risk stratification beyond the CHA2DS2VASc score and might be a novel tool for improved stroke prediction in AF. The efficacy of apixaban compared to warfarin is independent of the NT-proBNP level.

PMID: 23563134 [PubMed - as supplied by publisher]

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