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Scatterplot of atrial fibrillation cycle length (AFCL; milliseconds; mean ± SD) as a function of estimated atrial fibrillation duration on a logarithmic scale of horses with recurrence of atrial fibrillation (■) and those remaining in sinus rhythm (○) after successful transvenous electrical cardioversion. There is a significant negative correlation between mean AFCL and estimated duration of AF (Spearman's rank correlation coefficient −0.628; P = .005).
