- Participants must have an episode of decompensated heart failure (index event) requiring (a) an overnight stay [that is, staying past midnight] in a hospital, emergency department, or medical facility with the capability of treating with intravenous medications and observing heart failure patients before randomization or (b) an unscheduled outpatient visit to a heart failure management center, where parenteral therapy is required for heart failure stabilization. An episode of decompensated heart failure is defined as symptoms of worsening dyspnea or fatigue, objective signs of congestion such as peripheral edema or ascites, and/or adjustment of pre-hospitalization/outpatient visit heart failure medications. Participants are eligible for randomization at discharge from the facility treating the index event and up to 30 days after discharge if they are in stable condition