Atrial fibrillation is considered as a common complications of<unk>  cardiomyopathy. Prevalence of atrial fibrillation among<unk>  cardiomyopathy patients has been estimated as 20% in a 9 year follow up period. However it's prevalence in patients with<unk>  cardiomyopathy older than 70 years old is estimated as high as 40%.<unk>  cardiomyopathy patients with atrial fibrillation has a worse prognosis, compared to those without atrial fibrillation, even in when risk factors are corrected. Evidences of left atrial dysfunction based on echocardiography and electrocardiogram are associated to atrial fibrillation development in<unk>  cardiomyopathy patients. Heart failure and mortality as a result of it, stroke and serious functional impairment are some of the consequences of concurrent atrial fibrillation and<unk>  cardiomyopathy. The medical management of patients with<unk>  cardiomyopathy involves minimizing diastolic dysfunction, reducing left ventricular outflow tract obstruction, optimizing heart failure management, maintaining sinus rhythm, rate control and anticoagulation in the presence of atrial fibrillation.
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