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Atrial fibrillation (AFib) is broadly defined as an irregular heartbeat, but that won't tell the whole story.

In fact, there are distinct forms of AFib, and your management plan will depend on which form you suffer from. Your prognosis could depend on that detail, too.

So, what differentiates the three forms of AFib? Two key factors are duration and frequency: that is, how long each AFib episode lasts, and what sort of intervention it takes to stop it.