The Effects of IL-1 Blockade on Inotrope Sensitivity in Patients With Heart Failure (AID-HEART)

Heart failure (HF) represents a leading cause of morbidity and mortality worldwide. Despite improvements in treatments and widespread efforts to implement guideline directed medical therapies, a growing population of patients with end-stage HF has limited treatment options to improve their quality and quantity of life. When patients reach this point in their disease, the only treatments known to prolong life are cardiac transplantation or left ventricular assist devices. In patients who do not qualify for these options, intravenous (IV) drugs that directly stimulate increased cardiac output ("inotropes") are frequently used to offer symptomatic relief. Inotropes exert their pharmacologic effects through direct activation of the beta-adrenergic receptors in the heart that increase heart rate and contractility. Unfortunately, however, the relief of symptoms from inotropes is accompanied by dose-dependent increased risks of progressive adverse cardiac remodeling, arrhythmias, and sudden death. There is therefore an urgent need to develop treatments that minimize the dosing requirements for inotropes or improve responsiveness to these agents.

Inflammation has been recognized as a major pathophysiological contributor to HF. Interleukin (IL)-1 is a potent apical inflammatory cytokine that is abundant in HF patients and correlates with disease severity. Preclinical data have shown that IL-1 is sufficient to induce cardiac dysfunction, desensitize beta-adrenergic receptors (impaired responsiveness to inotropes), and reduce exercise capacity. Among the observed effects of IL-1 in these models of HF, the impaired responsiveness to inotropes showed the greatest signal-to-noise ratio, suggesting a large potential effect size for IL-1 blockade to translated to human subjects. In a 12-week pilot clinical trial in stable HF patients not receiving IV inotropes, daily administration of an IL-1 antagonist (anakinra) improved exercise capacity. However, IL-1 blockade has not yet been evaluated in patients with more advanced HF requiring inotrope therapy.

Inclusion criteria

• Primary diagnosis for the clinic visit is stage D heart failure being on chronic stable dose of inotrope therapy (dobutamine or milrinone for the previous 28 days)
• Prior documentation of impaired left ventricular systolic function (ejection fraction <50%) at most recent assessment by any imaging modality (within 12 months)
• Stable dose of inotrope treatment without a recent hospitalization within the previous month
• Age ≥21 years and willing/able to provide written informed consent
• The patient is willing and able to comply with the protocol (i.e. self administration of the treatment, and exercise protocol).
• Screening plasma C-reactive protein levels >2 mg/L

Exclusion criteria

• Concomitant clinically significant comorbidities including (but not limited to) acute coronary syndromes, uncontrolled hypertension or orthostatic hypotension, tachy- or brady-arrhythmias, acute or chronic pulmonary disease or neuromuscular disorders affecting respiration that would interfere with the execution, interpretation, or completion of the study
• Recent (previous 3 months) or planned resynchronization therapy (CRT), or valve surgeries
• Previous or planned implantation of left ventricular assist devices or heart transplant within the next 3 months
• Recent (<14 days) use of immunosuppressive or anti-inflammatory drugs (including oral corticosteroids at a dose of prednisone equivalent of 0.5 mg/kg/day but not including inhaled or low dose oral corticosteroids or non-steroidal anti-inflammatory drugs)
• Chronic inflammatory disorder (including but not limited to rheumatoid arthritis, systemic lupus erythematosus)
• Active infection (of any type), including chronic/recurrent infectious disease (including HBV, HCV, and HIV/AIDS) - but excluding HCV+ with undetectable plasma RNA
• Prior (within the past 5 years) or current malignancy on targeted treatment - excluding carcinoma in situ [any location] or localized non-melanoma skin cancer
• Stage V kidney disease or on renal-replacement therapy
• Neutropenia (<1,500/mm3 or <1,000/mm3 in African-American patients)
• Pregnancy or breastfeeding
• Angina, hypertension, arrhythmias, electrocardiograph (ECG) changes, or other non-cardiac limitations that limit 6MWD obtained during the baseline testing
• Hypersensitivity to anakinra or to E. coli derived products