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The correlation between the log‐transformed B‐type natriuretic peptide (BNP) level and the difference of mean R‐R interval between night and day (DIFF) (A), standard deviation of the mean of all R‐R intervals for all 5‐minute segments (SDARR) (B), and ratio of E velocity to early diastolic velocity (E/e′) (C) and the correlation between DIFF and E/e′ (D) in patients with atrial fibrillation.
