Some of the main symptoms of heart rhythm problems are:

Skipped Heart Beats

Skipped or missed heart beats are a common complaint and represent one of the causes of palpitations. Usually these are caused by an extra heart beat called an extrasystole.
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Blackouts

In some cases a very rapid heart rate or a very slow heart rate can cause a loss of consciousness because in either case the heart is unable to deliver enough blood flow to the brain.
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Palpitations

Palpitations are a sensation of the heart beating fast in the chest and may suggest that there is an underlying heart rhythm disturbance.
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