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Figure 2 Receiver-operating characteristic curve for various cutoff levels of B-type natriuretic peptide in differentiating between dyspnea due to acute heart failure and dyspnea due to other causes in patients with and without atrial fibrillation. The area under the curve was 0.84 (95% confidence interval 0.78 to 0.89) and 0.91 (95% confidence interval 0.89 to 0.93) for those with and without atrial fibrillation, respectively.
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