CAMBRIDGE, Mass.--(BUSINESS WIRE)--Biogen Idec (Nasdaq: BIIB) today announced the initiation of a Phase III clinical trial of intravenous (IV) ADENTRI® (BG9928), an adenosine A1 receptor antagonist, for acute decompensated heart failure (ADHF) patients with renal insufficiency. The trial will evaluate ADENTRI, which is being developed under a licensing agreement with CV Therapeutics (Nasdaq: CVTX), or placebo in addition to standard of care in approximately 900 patients in 21 countries globally, including the United States.