A Study of CLR325 in Chronic Stable Heart Failure Patients.

Key Inclusion Criteria:

Male and female patients >18 years of age
Body weight between 50 kg and 140 kg
Cardiac ejection fraction of ≤ 45% assessed within the last 6 months
For PA catheter cohorts, patients who are planned to have a clinically indicated pulmonary artery catheter in place prior to randomization
In the opinion of the investigator, heart failure patients who do not require a change in their dose of acetylcholinesterase (ACE), angiotensin receptor blocker (ARB), β-blocker, mineralocorticoid receptor antagonist, or diuretic for 24 h after randomization.
At Baseline, vital signs (systolic and diastolic blood pressure and pulse rate) assessment in the supine position after the subject has rested for at least five minutes.

Key Exclusion Criteria:

Impaired renal function as indicated by clinically significant abnormal creatinine values (Estimated glomerular filtration rate (eGFR) < 30 mL/min/1.73m2 calculated using the Modification of Diet in Renal Disease Study (MDRD) equation)
History of chronic hepatitis of any non-cardiac etiology
History of any active or clinically significant cardiac tachyarrhythmia (such as recurrent atrial fibrillation with rapid ventricular response within the last year) and patients with chronic atrial fibrillation with a pulse rate ≤ 100 bpm
Patients who received an i.v. infusion of a cardiac inotrope (e.g., dobutamine or milrinone) in the last 24 h prior to randomization
Patients with any significant change in their dose of their ACE, ARB, mineralocorticoid receptor antagonist, diuretic, or β-blocker within the last 12 h

Patients with known significant valvular heart diseases indicated by the following:

severe aortic stenosis (aortic valve area < 1.0 cm2 or peak gradient > 50 mm Hg as determined by echocardiography)
severe mitral stenosis
History of acute coronary syndrome within the last 60 days as determined by both clinical and enzymatic criteria
For echocardiography-based cohorts only, patients admitted to an inpatient setting for acute decompensated heart failure within the last 30 days
For PA catheter cohorts, patients with a pulmonary capillary wedge pressure of <10 mm Hg at Baseline. For echocardiographic cohorts, patients with a lateral E/E' ratio of < 7 on their baseline echocardiogram. For patients in whom a lateral E/E' ratio cannot be determined (e.g., patients in atrial fibrillation), a central venous pressure of < 5 mm Hg on baseline echocardiogram as determined by inferior vena cava criteria.