Difference between revisions of "Late potentials"

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m (New page: 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...)
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Revision as of 21:56, 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.

Criteria for late potentials on a signal averaged ECG
* filtered QRS duration > 114ms
  • RMS voltage in the terminal 40ms < 20 µV
  • low amplitude singal (LAS) duration > 38ms
  • Noise should be minimal with a standard deviation of the TP segment of < 1 µV