FUSION I Assesses Safety and Tolerability of Two Doses of NATRECOR (Nesiritide) Administered to Patients With Worsening Congestive (Decompensated) Heart Failure Who Are Concurrently Receiving Their Usual Cardiac Medications and Are at High Risk for Hospitalization.

The purpose of this study is to assess the safety and tolerability of two doses of nesiritide (a recombinant form of the natural human peptide normally secreted by the heart in response to heart failure) when administered serially as a treatment to outpatients with worsening congestive heart failure (decompensated CHF) who are receiving their usual cardiac medications and are at high risk for hospitalization.