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Natriuretic peptides are routinely quantified to diagnose heart failure (HF). Their concentrations are also elevated in atrial fibrillation (AF). To clarify their value in predicting future cardiovascular events, we measured natriuretic peptides in unselected patients with cardiovascular conditions and related their concentrations to AF and HF status and outcomes.

Consecutive patients with cardiovascular conditions presenting to a large teaching hospital underwent clinical assessment, 7‐day ECG monitoring, and echocardiography to diagnose AF and HF. NT‐proBNP (N‐terminal pro‐B‐type natriuretic peptide) was centrally quantified. Based on a literature review, four NT‐proBNP groups were defined (<300, 300–999, 1000–1999, and ≥2000 pg/mL). Clinical characteristics and NT‐proBNP concentrations were related to HF hospitalization or cardiovascular death. Follow‐up data were …