Heart Failure Optimization Study

Inclusion Criteria:

Part 1

Patients (≥18 years old) who were prescribed the WCD ≤ 10 days post-discharge after hospitalization for a primary reason of new onset HF (≤30 days since first HF hospitalization), with ischemic or nonischemic cardiomyopathy, and have used the WCD for no more than 30 days.
Patients who had an EF ≤ 35% during index hospitalization (must be last measurement if performed multiple times).

Part 2

Patients (≥18 years old) who were prescribed the WCD ≤ 10 days post-discharge after hospitalization for a primary reason of new onset HF (≤30 days since first HF hospitalization), with ischemic or nonischemic cardiomyopathy, and have already used a WCD for 90 ± 14 days.
Patients who had an EF ≤ 35% during index hospitalization (must be last measurement if performed multiple times). Of note, EF at 90 ± 14 days post-hospitalization does not need to be low to be included in the study.

Exclusion Criteria:

Patients under 18 years old.
Patients who have an active unipolar pacemaker.
Patients with a physical or mental condition that could impair their ability to properly interact with the device.
Patients currently participating in another clinical study.
Patients with any skin condition that would prevent wearing the device.
Patients with an advanced directive prohibiting resuscitation.
Patients who are indicated for cardiac resynchronization therapy or have a QRS duration of ≥135 ms.
Patients with recent myocardial infarction or coronary revascularization (since start of WCD wear; i.e. 0-90 days of WCD wear).