Difference between revisions of "Late potentials"

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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.
[[Image:late_potentials.svg|thumb]]
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[[Image:late_potentials.png|thumb]]
 
{| class="wikitable"  
 
{| class="wikitable"  
 
! Criteria for late potentials on a signal averaged ECG <cite>simson</cite><cite>Breithardt</cite>
 
! Criteria for late potentials on a signal averaged ECG <cite>simson</cite><cite>Breithardt</cite>

Revision as of 22:20, 22 January 2008

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.png
Criteria for late potentials on a signal averaged ECG [1][2]
  • filtered QRS duration > 114ms
  • 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

References

Error fetching PMID 7249291:
Error fetching PMID 2007727:
  1. Error fetching PMID 7249291: [simson]
  2. Error fetching PMID 2007727: [Breithardt]

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