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Late potentials in idiopathic dilated cardiomyopathy
G Iannucci1, M Villani, N Alessandri
1IV Clinica Medica, Università degli Studi La Sapienza di Roma.
Insights
Late ventricular potentials indicate a higher risk of ventricular tachycardia in idiopathic dilated cardiomyopathy patients. However, their role in predicting sudden cardiac death remains uncertain.
Area of Science:
- Cardiology
- Electrophysiology
Background:
- Idiopathic dilated cardiomyopathy (IDCM) is a significant cause of heart failure.
- Identifying patients at risk for ventricular tachycardia (VT) and sudden cardiac death (SCD) is crucial for management.
Purpose of the Study:
- To investigate the role of late ventricular potentials (LVPs) as potential markers for VT and SCD in IDCM patients.
- To assess the correlation between LVPs, ejection fraction, and clinical outcomes.
Main Methods:
- Twenty-five IDCM patients underwent Holter monitoring and analysis of LVPs.
- Patients were categorized based on the presence of VT and LVPs.
- Follow-up data included heart transplantation, pacemaker implantation, and mortality.
Main Results:
- VT was detected in 9 patients, all exhibiting LVPs (mean length 37.22 ms, mean voltage 5.62 µV).
- LVPs were found in only 2 of 16 patients without VT.
- No significant differences in ejection fraction were observed between groups.
- Sensitivity, specificity, and predictive accuracy for VT were 100%, 87%, and 81%, respectively.
Conclusions:
- Late ventricular potentials are strong indicators of susceptibility to ventricular tachycardia in patients with idiopathic dilated cardiomyopathy.
- The prognostic value of LVPs for sudden cardiac death in this population requires further investigation.
Abstract:
Twenty-five patients with idiopathic dilated cardiomiopathy were investigated in order to evaluate the role of late ventricular potentials as possible markers of ventricular tachycardia or sudden cardiac death. Holter monitoring showed ventricular tachycardia in 9 patients (group A) all of whom had late ventricular potentials, (mean +/- SD length 37.22 +/- 15.83 ms and mean +/- SD voltage 5.62 +/- 2.78 microV). Mean +/- SD ejection fraction in this group was 20 +/- 9.39%. In 16 patients (group B), without ventricular tachycardia, means +/- SD ejection fraction 27.5 +/- 8.17%; late ventricular potentials were recorded in 2 patients. During the follow-up period (means +/- SD 11.53 +/- 7.19 months), 3 patients underwent heart transplantation, 2 patients underwent pace-maker implantation and 2 patients from the ventricular tachycardia group died one from sudden cardiac death and the other from progressive heart failure. No significant differences were found in the ejection fraction either between the ventricular tachycardia and the non-ventricular tachycardia group, or between the late ventricular potentials and the non-late ventricular potential groups. Negative data were also obtained when we tried to find a correlation between the ejection fraction and late ventricular potential length and/or voltage. Good results were observed with regard to sensitivity (100%), specificity (87%) and predictive accuracy (81%) but follow-up data did not specify a definite prognostic value for late ventricular potentials. The Authors conclude that late ventricular potentials are markers of patients with idiopathic dilated cardiomyopathy who are prone to ventricular tachycardia. However, the role of late ventricular potentials in sudden cardiac death is still uncertain.