Assertion: atrial fibrillation | /r/CreatedBy | cardiac surgery
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text: Atrial fibrillation is caused by various cardiac conditions like hypertension, coronary artery disease, valvular heart disease, congestive heart failure, cardiomyopathy, congenital heart disease, cardiac surgery and non-cardiac conditions like chronic obstructive pulmonary disease, acute pulmonary embolism, obstructive sleep apnoea and hyperthyroidism.