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59235 Medicine

In non-rheumatic atrial fibrillation, true is?

AParoxysmal atrial fibrillation is associated with a lower risk of stroke
BThe risk of stroke ii less than in atrial fibrillation due to rheumatic valve disease (Correct Answer)
CExcess alcohol intake is an unlikely cause
DCardioversion may be performed without anticoagulation if a transthoracic echocardiogram is normal