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Arrhythmias - What Is an Arrhythmia? | NHLBI, NIH
https://www.nhlbi.nih.gov/health/arrhythmias
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An arrhythmia is a problem with the rate or rhythm of your heartbeat. Your heart may beat too fast, too slowly, or with an irregular rhythm. Learn about the causes, symptoms, and treatments for arrhythmia.
