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Dispersion of ventricular activation and refractoriness in patients with idiopathic dilated cardiomyopathy
J L Dinerman1, R Berger, M C Haigney
1Department of Medicine, The Johns Hopkins Hospital, Baltimore, Maryland, USA.
Insights
Idiopathic dilated cardiomyopathy patients show abnormal heart electrical activity, increasing risks for ventricular arrhythmias and sudden cardiac death. These findings highlight electrophysiologic abnormalities as key factors in disease progression.
Area of Science:
- Cardiology
- Electrophysiology
- Heart Failure Research
Background:
- Idiopathic dilated cardiomyopathy (IDCM) is a significant cause of heart failure.
- Ventricular arrhythmias and sudden cardiac death (SCD) are major complications in IDCM patients.
- Understanding the underlying electrophysiologic substrate is crucial for risk stratification and management.
Purpose of the Study:
- To investigate the electrophysiologic abnormalities associated with ventricular arrhythmias and SCD in patients with IDCM.
- To compare electrophysiologic parameters between IDCM patients and healthy controls.
Main Methods:
- Electrophysiologic studies were conducted in patients with IDCM and a control group.
- Measurements included activation times, dispersion of activation and recovery, and monophasic action potential duration (MAPD) at 70% and 90% repolarization.
Main Results:
- Patients with IDCM exhibited significantly prolonged activation times compared to controls.
- Increased dispersion of activation and recovery was observed in the IDCM group.
- A prolonged duration of monophasic action potential recordings at 70% repolarization was found in IDCM patients, but not at 90%.
Conclusions:
- Electrophysiologic abnormalities, including prolonged activation and dispersion, are present in IDCM.
- Altered repolarization dynamics, specifically at 70% repolarization, may contribute to arrhythmogenesis in IDCM.
- These findings underscore the importance of electrophysiologic assessment in managing IDCM patients at risk for sudden cardiac death.
Abstract:
We sought to evaluate the electrophysiologic substrate for ventricular arrhythmias and sudden cardiac death in patients with idiopathic dilated cardiomyopathy. When compared with controls, patients with cardiomyopathy had prolonged activation times, increased dispersion of activation and recovery, and prolonged duration of monophasic action potential recordings at 70%, but not at 90%, of repolarization.