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The purpose of this study is to determine whether mechanical alternans (alternating strong and weak heart beats with a constant beat-to-beat interval), can be used to predict malignant ventricular arrhythmias, requiring defibrillation or appropriate ICD therapies, and to predict progression of heart failure and death.
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Ages Eligible for Study:
18 Years and older (Adult, Senior)
Sexes Eligible for Study:
Accepts Healthy Volunteers:
Patients with structural heart disease, ischemic or non-ischemic cardiomyopahty