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. | ||
{| | {| 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> | ||
|- | |- | ||
| * filtered QRS duration > 114ms | | * filtered QRS duration > 114ms | ||
* RMS voltage | * terminal (last 40ms) QRS root means square (RMS) voltage < 20 µV | ||
* low amplitude | * 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> | |||
Revision as of 21:59, 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 [1][2] |
|---|
* filtered QRS duration > 114ms
|
References
- Simson MB. Use of signals in the terminal QRS complex to identify patients with ventricular tachycardia after myocardial infarction. Circulation. 1981 Aug;64(2):235-42. DOI:10.1161/01.cir.64.2.235 |
- Breithardt G, Cain ME, el-Sherif N, Flowers NC, Hombach V, Janse M, Simson MB, and Steinbeck G. Standards for analysis of ventricular late potentials using high-resolution or signal-averaged electrocardiography: a statement by a task force committee of the European Society of Cardiology, the American Heart Association, and the American College of Cardiology. J Am Coll Cardiol. 1991 Apr;17(5):999-1006. DOI:10.1016/0735-1097(91)90822-q |