Hemodynamic Assessment of underLying myocyTe Function in Right Heart Failure

This study assesses heart function in detail using specialized cardiac monitoring in adults with reduced heart pumping function (heart failure with reduced ejection fraction) to better understand what is happening at the cellular level in the right side of the heart. **You may be eligible if...** - You are 18–90 years old with a confirmed diagnosis of heart failure with reduced ejection fraction (left ventricle pumps 40–50% or less) - You can safely pause blood-thinning medications for 48 hours before the procedure **You may NOT be eligible if...** - Your blood thinners cannot be safely paused (especially vitamin K antagonists with an INR above 1.5) - You are pregnant - You were hospitalized or had a flare-up of heart failure within the past 2 weeks - You are currently in another drug trial - You cannot lie flat - You have unstable blood pressure or circulation at rest Talk to your doctor to see if this trial is right for you.