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Atrial fibrillation
Atrial fibrillation
(
AF
or
A-fib
) is an
abnormal heart rhythm
characterized by rapid and irregular beating. Often it starts as brief periods of abnormal beating which become longer and possibly constant over time. Most episodes have
no symptoms
. Occasionally there may be
heart palpitations
,
fainting
,
shortness of breath
, or
chest pain
. The disease increases the risk of
heart failure
,
dementia
, and
stroke
. It is a type of
supraventricular tachycardia
.
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