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Electrophysiological basis of ventricular late potentials
N el-Sherif1, W B Gough, M Restivo
1Department of Medicine, State University of New York Health Science Center, Brooklyn 11203.
Pacing and Clinical Electrophysiology : PACE
|December 1, 1990
Summary
Late potentials on body surface recordings correlate with delayed heart activation but may miss reentrant circuits. High-resolution, beat-to-beat recordings are needed for better detection of arrhythmogenic substrates.
Area of Science:
- Cardiology
- Electrophysiology
- Biomedical Engineering
Background:
- Late potentials on body surface recordings are linked to ventricular activation maps in postinfarction models.
- These potentials correlate with delayed myocardial activation, indicating potential arrhythmogenic substrates.
Purpose of the Study:
- To investigate the correlation between body surface late potentials and ventricular activation maps in reentrant circuits.
- To understand the limitations of late potentials in detecting reentrant excitation and explore improved recording techniques.
Main Methods:
- Utilized a postinfarction canine model to study reentrant excitation.
- Correlated body surface late potentials with ventricular activation maps.
- Assessed the impact of reentrant circuit characteristics (cell mass, conduction velocity) on late potential detection.
Main Results:
- Late potentials correlate with delayed myocardial activation.
- Complete diastolic activity on body surface recordings may not be detected if the electrically active cell mass is small or conduction is very slow.
- Myocardial zones generating late potentials during basic rhythms may differ from critical zones during reentrant activation.
Conclusions:
- Late potentials are valuable but have limitations in detecting all reentrant circuits, especially those with low amplitude potentials.
- Dynamic changes in late potentials require high-resolution, beat-to-beat recording techniques, not temporal signal averaging.
- A deeper understanding of late potential electrophysiological limitations can improve clinical utilization and guide new methods for detecting arrhythmogenic substrates.