The purpose of the study is to evaluate if formoterol fumarate is effective in treating patients with diabetic kidney disease. Study participants will be randomly assigned to either receive formoterol fumarate (in addition to their current standard of care treatment) or standard of care treatment only. Study participants will have a 50% chance of receiving formoterol fumarate and a 50% chance of not receiving formoterol fumarate. Both groups will continue their standard of care treatment during the study.

Patients suspected of having compromised heart function often require invasive right heart catheterization for diagnosis and management. This study is testing the Cardiac Performance System (CPS), a non-invasive device that uses sensors and electrocardiogram (ECG) electrodes to measure heart function. The purpose of this study is to determine if the CPS provides pulmonary pressure assessment similar to that obtained through right heart catherization.