Open-label Extension Study to Evaluate Long-term Safety of Sacubitril/Valsartan in Pediatric Patients With HF

Inclusion Criteria: * Signed informed consent * On study drug at PANORAMA-HF Part 2 EOS visit. Does not have any significant safety issue Exclusion Criteria: * Subject only participated in PANORAMA-HF Part 1 or was a SF in PANORAMA-HF or permanently discontinued study drug in PANORMA-HF Part 2 * Use of investigational drugs within 5 half-lives of enrollment or within 30 days (longer duration); with the exception of PANORAMA-HF study drug (requires \>/=36-hour washout before baseline visit) * History of hypersensitivity or allergy to study treatment, its excipients or drugs of similar chemical class, ACEIs, ARBs, or NEP inhibitor and known/suspected contraindications to sacubitril/valsartan * Renal vascular hypertension (including renal artery stenosis) * Significant renal estimated glomerular filtration rate disorder (eGFR calculated using modified Schwartz formula \<30% mean GFR for age); hepatic disorder (serum aspartate aminotransferase or alanine aminotransferase \> 3 times upper limit of normal); gastrointestinal disorder or biliary disorder * History of angioedema * Parents or legal guardians of subject who do not give consent or allow the child to give assent, or inability of patient or parents/legal guardians to follow instructions or comply with follow-up procedures * Any medical condition(s) that may put the patient at risk in the investigator's opinion or that the investigator deems unsuitable for the study * Other protocol defined inclusion/exclusion criteria may apply