Electrophysiologic and Morphologic Assessment of the Substrate to Guide Implantation of Defibrillators in Dilated Cardiomyopathy (EMOSIDD)
Recruitment status was: Recruiting
Primary Prevention of Sudden Cardiac Death
Implantable Cardioverter Defibrillator
|Study Design:||Observational Model: Case Control
Time Perspective: Prospective
- Arrhythmic Event [ Time Frame: 2 years ] [ Designated as safety issue: No ]ICD shock on rapid sustained ventricular tachycardia or ventricular fibrillation or effective antitachycardia pacing.
- Change in Arrhythmogenic Substrate [ Time Frame: 2 years ] [ Designated as safety issue: No ]Change in the arrhythmogenic substrate in patients who will experience an arrhythmic event compared to a matched control group who will remain free from arrhythmic event.
- Heart failure events [ Time Frame: 2 years ] [ Designated as safety issue: No ]Hospitalization for heart failure events
- Death [ Time Frame: 2 years ] [ Designated as safety issue: No ]All-cause mortality
|Study Start Date:||November 2009|
A correct identification of patients at high risk of sudden cardiac death is crucial for a rational clinical management, since the demonstrated effectiveness of implantable cardioverter-defibrillators on the reduction of sudden cardiac death. Basing on the results of multiple clinical trials, left ventricular systolic function, measured as ejection fraction, is currently the only recommended tool to identify patients at higher risk of sudden death that would benefit from a prophylactic defibrillator. However, the systematic implementation of current recommendations results in a substantial number of inappropriate defibrillator implantations, while failing to prevent the majority of sudden deaths occurring in the general population. Unfortunately, at present time we have no other way to identify patients at higher risk of sudden cardiac death, since other proposed risk markers have not been consistently demonstrated of incremental value. Recent data suggest that several substrate markers, either assessed morphologically with magnetic resonance imaging, or electrophysiologically with invasive mapping procedures, may be helpful to identify subgroup of patients at higher arrhythmic risk. However, previous studies have been largely conducted on few patients, most were retrospective or with short follow-up.
We will submit patients with dilated cardiomyopathy undergoing implant of an implantable cardioverter defibrillator to a morphologic and electrophysiologic substrate evaluation including cardiac magnetic resonance with gadolinium contrast-enhancement study, and electroanatomic mapping with bipolar electrogram voltage and morphological analysis. The electroanatomic mapping and cardiac magnetic resonance will be repeated at the time of the first arrhythmic event.
We expect to define the role of anatomical and electrophysiological substrate abnormalities in determining malignant ventricular arrhythmias in patients with dilated cardiomyopathy, thus allowing a better risk stratification and prevention of sudden death.
Please refer to this study by its ClinicalTrials.gov identifier: NCT01378572
|United States, Texas|
|Texas Cardiac Arrhythmia Institute, St. David's Medical Center|
|Austin, Texas, United States, 78705|
|Centro Cardiologico Monzino|
|Milan, Italy, 20138|
|Policlinico "A. Gemelli"|
|Rome, Italy, 00168|