Background: Daily variability of heart rate in 24-h Holter recordings in dogs with atrial fibrillation (AF) receiving antiarrhythmic drugs (AAD) is unknown and could influence medical decisions.
Hypothesis/objectives: Dogs with AF, Holter-derived mean heart rate (meanHRHolter) over 24 h is not significantly different from a subsequent, consecutive 24-h period.
Animals: Twenty-five dogs with AF.