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OBJECTIVES The purpose of this study was to assess the safety and efficacy of recombinant human neuregulin-1rhNRG-1)in chronic heart failure(CHF)patients.Background Neuregulin-1 plays important roles in maintaining cardiomyocyte structure and cardiac pumping functionality and physiology.Previously,rhNRG-1 was proven to be effective in treating heart failure in animals by reducing enddiastolic volume(EDV)and end-systolic volume(ESV)and increasing left ventricular ejection fraction(LVEF%).