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==Change in rhythm==
 
==Change in rhythm==
Example: new atrial fibrillation. Atrial fibrillation occurs in ten percent of elderly people (>70 year) without clinical symptoms. Therefore atrial fibrillation in acute dyspneic patients does not prove atrial fibrillation-induced cardiac decompensation. Also other causes (e.g. cardiac ischemia, pneumonia) should be considered. Previous ECGs could provide additional information.
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Example: New atrial fibrillation. Atrial fibrillation occurs in ten percent of elderly people (>70 year) without clinical symptoms. Therefore atrial fibrillation in acute dyspneic patients does not prove atrial fibrillation-induced cardiac decompensation. Also other causes (e.g. cardiac ischemia, pneumonia) should be considered. Previous ECGs could provide additional information.
    
==Frequency==
 
==Frequency==
Example: bradycardia. New sinus bradycardia of 50 beats per minute (bpm) may cause dizziness; however, long-existing bradycardias are often without symptoms. Therefore it is important to know the patient's normal frequency.
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Example: Bradycardia. New sinus bradycardia of 50 beats per minute (bpm) may cause dizziness; however, long-existing bradycardias are often without symptoms. Therefore it is important to know the patient's normal frequency.
    
==Conduction time==
 
==Conduction time==
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