4. Treatment of CHF with stable and optimal pharmacological therapy according to Chinese guidelines for treatment of CHF. In general, optimal treatment will include a beta-blocker and an ACE inhibitor and/or an angiotensin receptor blocker, unless not tolerated. Medical therapy is defined as stable, if the subject has not started a new CHF drug class and the dose of drugs taken have not been changed during the 3 months prior to screening and randomization.