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Significance of accelerated idioventricular rhythm in idiopathic dilated cardiomyopathy
1Department of Cardiology, Hospital of the Philipps-University of Marburg, Germany.
Insights
In idiopathic dilated cardiomyopathy patients, accelerated idioventricular rhythm did not impact outcomes. However, nonsustained ventricular tachycardia was linked to more major arrhythmic events and reduced transplant-free survival.
Area of Science:
- Cardiology
- Electrophysiology
- Heart Failure Research
Background:
- Idiopathic dilated cardiomyopathy (IDCM) is a significant cause of heart failure.
- Ventricular arrhythmias are common in IDCM but their prognostic implications require further clarification.
Purpose of the Study:
- To investigate the prognostic value of specific ventricular arrhythmias detected by Holter monitoring in patients with IDCM.
- To compare the incidence of major arrhythmic events and transplant-free survival based on the presence of accelerated idioventricular rhythm (AIVR) and nonsustained ventricular tachycardia (NSVT).
Main Methods:
- Holter monitoring was conducted in 202 patients diagnosed with IDCM.
- Patients were prospectively followed for a mean of 32 months.
- Outcomes assessed included major arrhythmic events and transplant-free survival.
Main Results:
- Accelerated idioventricular rhythm (AIVR) was identified in 8% of patients, with no significant difference in outcomes compared to those without AIVR.
- Nonsustained ventricular tachycardia (NSVT) was detected in 35% of patients.
- Patients with NSVT exhibited a significantly higher rate of major arrhythmic events and a lower transplant-free survival rate.
Conclusions:
- AIVR in IDCM patients does not appear to be associated with adverse short-term outcomes.
- NSVT in IDCM is a significant predictor of poor prognosis, associated with increased arrhythmic events and reduced survival.
- Holter monitoring and identification of NSVT are crucial for risk stratification in IDCM management.
Abstract:
Holter monitoring was performed in 202 patients with idiopathic dilated cardiomyopathy, which revealed accelerated idioventricular rhythm in 16 patients (8%) and nonsustained ventricular tachycardia in 70 patients (35%). During 32 +/- 15-month prospective follow-up, no significant difference was observed for major arrhythmic events and transplant-free survival between patients with and without accelerated idioventricular rhythm, whereas patients with nonsustained ventricular tachycardia had a significantly higher incidence of major arrhythmic events and a lower transplant-free survival rate.