Late potentials: Difference between revisions

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Late potentials are thought to be caused by early afterdepolarizations of cells in the right ventricle (in [[ARVD]]). Their amplitude is often too small to show up on a normal ECG. However, when multiple QRS recordings (typically 250 consecutive QRS complexes) are averaged, random noise is filtered out and late potentials can show up.
Late potentials are thought to be caused by early afterdepolarizations of cells in the right ventricle (in [[ARVD]]). Their amplitude is often too small to show up on a normal ECG. However, when multiple QRS recordings (typically 250 consecutive QRS complexes) are averaged, random noise is filtered out and late potentials can show up.


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{| class="wikitable"  
! Criteria for late potentials on a signal averaged ECG
! Criteria for late potentials on a signal averaged ECG <cite>simson</cite><cite>Breithardt</cite>
|-
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| * filtered QRS duration > 114ms
| * filtered QRS duration > 114ms
* RMS voltage in the terminal 40ms < 20 µV
* terminal (last 40ms) QRS root means square (RMS) voltage < 20 µV
* low amplitude singal (LAS) duration > 38ms
* low amplitude (<40 µV) signal (LAS) duration > 38ms
* Noise should be minimal with a standard deviation of the TP segment of < 1 µV
* Noise should be minimal with a standard deviation of the TP segment of < 1 µV
|}
|}
==References==
<biblio>
#simson pmid=7249291
#Breithardt pmid=2007727
</biblio>