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# frequent atrial or ventricular premature beats
 
# frequent atrial or ventricular premature beats
 
# fascicular blocks
 
# fascicular blocks
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==ECG markers of increased risk of ventricular arrhythmias in ICD patients==
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In a recent study several ECG risk markers were found to be associated with appropiate therapy in ICD patients<cite>Shi</cite>:
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* depressed heart rate variability (HRV) [HR 2.7]
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* BBB with large QRS dispersion of > 39 msec (difference between maximal and minimum QRS across 12 leads) [HR 2.9]
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* Reduced maximal T wave amplitude (<0.4 msec in patients without BBB) [HR 3.8]
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* History of atrial arrhythmias [HR 2.3]
    
==References==
 
==References==
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#novacode pmid=9682893
 
#novacode pmid=9682893
 
#Denes pmid=17341712
 
#Denes pmid=17341712
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#Shi pmid=23118007
 
</biblio>
 
</biblio>

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