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Time to cardioversion as a function of the cumulative duration of atrial fibrillation. Time to cardioversion (in min) was log transformed and plotted against the cumulative duration of self‐sustained atrial fibrillation (AF) for all flecainide infusions in horses with AF. Linear regression revealed a slope of 0.04 (95% CI 0.02, 0.05) with a coefficient of determination of 0.80
