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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 dyspnoic patients does not prove cardiac decompensation indunced by atrial fibrillation. Also other causes (e.g. cardiac ischemia, pneumonia) should be considered. Previous ECG registrations could provide additional information.
 
Example: new atrial fibrillation. Atrial fibrillation occurs in ten percent of elderly people (>70 year) without clinical symptoms. Therefore atrial fibrillation in acute dyspnoic patients does not prove cardiac decompensation indunced by atrial fibrillation. Also other causes (e.g. cardiac ischemia, pneumonia) should be considered. Previous ECG registrations could provide additional information.
 
==Frequency==
 
==Frequency==
Example: bradycardia. New sinusbradycardia of 50 beats per minute (bpm) may cause dizziness, however, long existing bradycardias are often without symptoms. It is important to know about someones previous frequency.
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Example: bradycardia. New sinusbradycardia of 50 beats per minute (bpm) may cause dizziness, however, long existing bradycardias are often without symptoms. Therefore it is important to know about someones normal frequency.
    
==Conduction time==
 
==Conduction time==

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