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Almost always, single skipped heartbeats, irrespective of cause, are benign. Typically, the shorter the episode of fast heartbeats, the less concerning they are to doctors. But brief “flutters” that are long enough might require treatment, particularly if they make you lightheaded or cause you to pass out. Any palpitations that cause lightheadedness or loss of consciousness should always be brought to the attention of your doctor and should be evaluated.