Study of the Wearable Defibrillator in Heart-Failure Patients

Inclusion Criteria:

Patients with NYHA class III or IV during the past month and one or more of the following:

hospitalization for cardiac decongestion and stabilization,
advanced heart failure receiving intravenous diuretics/inotropics in an outpatient clinic, or
awaiting cardiac transplantation

Patients with left ventricular ejection fraction ≤ 35% and either one of the following:

coronary revascularization within 3 calendar months prior to enrollment, or
heart failure of non-ischemic origin diagnosed within 3 calendar months prior to enrollment.
Patients awaiting ICD re-implantation following device explantation or lead extraction,
Patients hospitalized with acute myocardial infarction and Killip Class III/IV.

Exclusion Criteria:

The presence of an implantable cardioverter defibrillator prior to enrollment.
Advanced cerebrovascular disease.
Non-cardiac terminal illness associated with reduced likelihood of survival for the duration of the study.
Use of supplemental oxygen in an outpatient setting requiring an external oxygen tank.
Pregnancy.