The purpose of this study is to find out more about how an investigational study drug called omecamtiv mecarbil, works in people with heart failure. Omecamtiv mecarbil is also known as AMG 423. Omecamtiv mecarbil is an investigational medicine that increases the heart?s ability to pump. In this study, omecamtiv mecarbil will be compared to placebo.
Heart failure often causes fluid to accumulate in the body, leading to congestion and swelling. However, some people who have had heart failure for a long time seem to have very little congestion or swelling, even when the heart failure is poorly treated. We think that this is because lymphatic vessels are able to grow and remove fluid to prevent congestion. We do not know how lymphatic vessels grow. This study will investigate the blood levels of various proteins to see if we can figure out how the lymph vessels of people with long-standing heart failure might grow.