Systolic Heart Failure Clinical Trial
The purpose of this study is to determine if udenafil improves exercise tolerance in patients with systolic heart failure.
Udenafil (Zydena), a newly developed PDE-5 inhibitor, has been proved to have similar efficacy and safety profile, compared with other PDE-5 inhibitors. Also, laboratory data showed that udenafil inhibits ventricular hypertrophy and fibrosis in rat heart failure model. Based on these results, the investigators hypothesized that udenafil would improve symptom, exercise capacity and hemodynamic status in patients with systolic heart failure. In this 12-week, randomized, double-blind, placebo-controlled trial, patients with systolic heart failure will be enrolled according to the eligibility criteria. After randomization, study participants will be assigned to receive either 50mg of udenafil or placebo two times a day for 4 weeks, and then the dosage will be doubled to 100mg two times a day for next 8 weeks. Participants will attend study visits at baseline and weeks 4 and 12. Physical examination, medical history review, blood sample collection and electrocardiogram will be conducted on each study visits. At baseline and week 12, participants will undergo cardiopulmonary exercise test and exercise echocardiography. At every study visits,researchers will collect health information. ;
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