Study to Evaluate Safety, Tolerability, Pharmacokinetics and Pharmacodynamics of LCZ696 Followed by a 52-week, Double-blind Study of LCZ696 Compared With Enalapril in Pediatric Patients With Heart Failure

Multicenter, Open-label Study to Evaluate Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of LCZ696 Followed by a 52-week Randomized, Double-blind, Parallel Group, Active-controlled Study to Evaluate the Efficacy and Safety of LCZ696 Compared With Enalapril in Pediatric Patients From 1 Month to < 18 Years of Age With Heart Failure Due to Systemic Left Ventricle Systolic Dysfunction

This study consists of two parts (Part 1 and Part 2). The purpose of Part 1 is to evaluate the way the body absorbs, distributes, metabolizes and removes the drug LCZ696. This will help determine the proper dose of LCZ696 for Part 2 of the study.

The purpose for Part 2 is to compare the effectiveness and safety of LCZ696 with enalapril in a double-blind manner, in pediatric heart failure patients over 52 weeks of treatment.

This study consists of two parts (Part 1 and Part 2). The purpose of Part 1 is to evaluate the way the body absorbs, distributes, metabolizes and removes the drug LCZ696. This will help determine the proper dose of LCZ696 for Part 2 of the study.

The purpose for Part 2 is to compare the effectiveness and safety of LCZ696 with enalapril in a double-blind manner, in pediatric heart failure patients over 52 weeks of treatment.

Key Inclusion Criteria:

• Chronic heart failure (CHF) resulting from left ventricular systolic dysfunction, and receiving chronic HF therapy (if not newly diagnosed)
• New York Heart Association (NYHA) classification II-IV (older children: 6 to <18 years old) or Ross CHF classification II-IV (younger children: < 6 years old)
• Systemic left ventricular ejection fraction ≤ 45% or fractional shortening ≤22.5%
• For Part 1 study: Patients must be treated with an angiotensin converting enzyme inhibitor (ACEI) or angiotensin receptor blockers (ARB) prior to screening. Patients in Group 1 and 2 must be currently treated with the dose equivalent of at least enalapril 0.2 mg/kg prior to the LCZ696 3.1 mg/kg administration. Group 3 patients will participate in LCZ696 0.8 mg/kg and not LCZ696 3.1 mg/kg.
• Biventricular physiology with systemic left ventricle

Key Exclusion Criteria:

• Patient with single ventricle or systemic right ventricle
• Patients listed for heart transplantation (as United Network for Organ Sharing status 1A) or hospitalized waiting for transplant (while on inotropes or with ventricular assist device)
• Sustained or symptomatic dysrhythmias uncontrolled with drug or device therapy
• Patients that have had cardiovascular surgery or percutaneous intervention to palliate or correct congenital cardiovascular malformations within 3 months of the screening visit. Patients anticipated to undergo corrective heart surgery during the 12 months after entry into Part 2
• Patients with unoperated obstructive or severe regurgitant valvular (aortic, pulmonary, or tricuspid) disease, or significant systemic ventricular outflow obstruction or aortic arch obstruction
• Patients with restrictive or hypertrophic cardiomyopathy
• Active myocarditis
• Renal vascular hypertension (including renal artery stenosis)
• Moderate-to severe obstructive pulmonary disease
• Serum potassium > 5.3 mmol/L
• History of angioedema
• Allergy or hypersensitivity to ACEI / ARB