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[Late ventricular potentials: significance, electrophysiology and clinical importance in coronary disease]
1Centre de cardiologie, Hôpital cantonal universitaire et Unité de cardiologie, Hôpital de La Tour, Genève.
Insights
Ventricular late potentials, abnormal heart signals, help identify patients at risk for dangerous arrhythmias after a heart attack. While their negative predictive value is high, their role in guiding individual treatment requires further definition.
Area of Science:
- Cardiology
- Electrophysiology
- Medical Diagnostics
Context:
- Ventricular late potentials (VLPs) are abnormal electrical signals detected on electrocardiograms.
- They indicate delayed myocardial activation, suggesting an arrhythmogenic substrate, particularly post-myocardial infarction.
- VLPs are linked to malignant ventricular arrhythmias.
Purpose:
- To summarize the diagnostic and prognostic significance of ventricular late potentials.
- To evaluate their role in risk stratification for post-myocardial infarction patients.
- To discuss their clinical utility in managing ventricular arrhythmias.
Summary:
- Ventricular late potentials are high-frequency, low-amplitude signals in the terminal QRS or ST segment, reflecting delayed myocardial activation.
- Their presence is a marker for arrhythmogenic substrates, especially after myocardial infarction, and is associated with malignant ventricular arrhythmias.
- Detection of VLPs is a noninvasive tool for initial risk stratification in post-MI patients, complementing other diagnostic methods.
Impact:
- VLPs have a high negative predictive value (93-98%) for malignant arrhythmias, aiding in identifying low-risk patients.
- Their positive predictive value is lower (6-19%), meaning not all patients with VLPs develop arrhythmias.
- Established prognostic value in post-MI patients, though their precise role in individual patient management remains under investigation.
Abstract:
Ventricular late potentials are high-frequency, low-amplitude abnormal electrical signals occurring in the terminal QRS complex or on the ST segment of the electrocardiogram during sinus rhythm. They are thought to represent delayed activation of some areas of a diseased myocardium and are therefore considered as a marker of an arrhythmogenic substrate, especially in patients after myocardial infarction. An association between the presence of ventricular late potentials and the occurrence of malignant re-entrant ventricular arrhythmias has been clearly demonstrated, and the prognostic value of late potentials after myocardial infarction has been confirmed by several large prospective trials. Because it is a simple and noninvasive technique, the detection of ventricular late potentials allows a first risk stratification of postmyocardial infarction patients, together with the Holter recording, the exercise stress test, the echocardiography and the radionuclide ventriculography. Such a risk stratification strategy is essential because the empirical use of antiarrhythmic drugs has been associated with an adverse prognosis and because significant advances have been made in the management of malignant ventricular arrhythmias. The clinical value of ventricular late potentials is mainly related to their negative predictive value (93 to 98%), and their positive predictive value has been shown to be low (6 to 19%). But even if the prognostic value of late potentials after myocardial infarction is now well established, their exact role for the management of individual patients still needs to be defined.