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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. Such a recording is called a Signal Averaged ECG (SAECG). | ||
The ARVD taskforce has published a document with [http://arvd.org/SAECG%20protocol.pdf recommended settings] to record an SAECG in ARVD. | |||
{| | [[Image:late_potentials.png|thumb]] | ||
! Criteria for late potentials on a signal averaged ECG | {| class="wikitable" | ||
! Criteria for late potentials on a signal averaged ECG <cite>simson</cite><cite>Breithardt</cite> | |||
|- | |- | ||
| * filtered QRS duration > 114ms | | | ||
* RMS voltage | * filtered QRS duration > 114ms | ||
* low amplitude | * terminal (last 40ms) QRS root means square (RMS) voltage < 20 µV | ||
* 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> | |||