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There is a greater success with conversion in young horses and when conversion is attempted shortly following the onset of the arrythmia. If the arrythmia has been present for more than 4 months, therapeutic success is much less common and there is a higher recurrence rate.
 
There is a greater success with conversion in young horses and when conversion is attempted shortly following the onset of the arrythmia. If the arrythmia has been present for more than 4 months, therapeutic success is much less common and there is a higher recurrence rate.
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Horses can also develop atrial fibrillation secondary to '''cardiac disease''', such as [[Mitral Valve Dysplasia|mitral valve insufficiency]], [[Tricuspid Valve Dysplasia|tricuspid valve insufficiency]], or any acquired or congenital disease leading to atrial hypertrophy. Horses will usually develop '''congestive heart failure''' and have a resting tachycardia. These underlying conditions should be diagnosed and the congestive heart failure treated with diuretics and inotropes. These horses will have a poor prognosis for return to function and treatment is mainly to slow progression of disease.
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Horses can also develop atrial fibrillation secondary to '''cardiac disease''', such as [[Degenerative Mitral Valve Disease|mitral valve insufficiency]], [[Tricuspid Valve Dysplasia|tricuspid valve insufficiency]], or any acquired or congenital disease leading to atrial hypertrophy. Horses will usually develop '''congestive heart failure''' and have a resting tachycardia. These underlying conditions should be diagnosed and the congestive heart failure treated with diuretics and inotropes. These horses will have a poor prognosis for return to function and treatment is mainly to slow progression of disease.
    
===Cattle===
 
===Cattle===
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