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  • Atrial Fibrillation 
    Atrial Fibrillation: A continuous and chaotic arrhythmia of the left and right atria. Paroxysmal (intermittent) atrial fibrillation is usually associated with normal hearts; chronic atrial fibrillation is associated with heart disease. Approximately 80% of atrial fibrillation originates in the left atrium of the heart. Symptoms of atrial fibrillation include dizziness and weakness.