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Late potentials

159 bytes added, 21:59, 22 January 2008
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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.
{| styleclass="Wikitablewikitable"! Criteria for late potentials on a signal averaged ECG<cite>simson</cite><cite>Breithardt</cite>
| * filtered QRS duration > 114ms
* terminal (last 40ms) QRS root means square (RMS ) voltage in the terminal 40ms < 20 µV* low amplitude singal (<40 µV) signal (LAS) duration > 38ms
* Noise should be minimal with a standard deviation of the TP segment of < 1 µV
#simson pmid=7249291
#Breithardt pmid=2007727

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