Inclusion Criteria:
Children with severe (Ross or New York Heart Association) class IV HF despite optimal medical therapy (Interagency Registry for Mechanically Assisted Circulatory Support \[INTERMACS\] profile 1 or 2 for pediatrics) who require mechanical circulatory support as a bridge to transplant and meet all the criteria below:
1. Males and females with body weight between 8 kg, and 30 kg
2. Body surface area (BSA) between 0.4 m2 and 1.0 m2
3. Two-ventricle circulation, including cardiomyopathy, repaired structural heart disease (e.g., anomalous left coronary artery from the pulmonary artery \[ALCAPA\], aortic stenosis) or acquired heart disease (e.g., , Kawasaki disease) 4. INTERMACS Profile 1 or 2 as evidenced by: a. Inability to wean from extra-corporeal membrane oxygenation (ECMO) or other temporary circulatory support (TCS), OR b.Inability to wean from mechanical ventilator support, OR c. Inotrope-dependent,decompensatedHFANDmeetoneormoreofthe following severity criteria within 48 hours prior to implant (unless otherwise noted), attributed to decompensated HF despite optimal medical therapy: i. Urine output \<0.5 cc/kg/hour for 12hr ii. Creatinine level \>2 times the upper limit of normal (ULN) for age iii. Alanine aminotransferase (ALT) or total bilirubin level \>3 times the ULN for age (either qualifies the patient) iv. Mixed venous oxygen saturation (SvO2) \<55% (or arteriovenous oxygen difference \>45%) v. Acidosis: Base excess \>-5 vi. Inability to tolerate appropriate enteral calories vii. Inability to ambulate or participate in age-appropriate activities of daily living (ADLs) and/or cardiac rehabilitation/physical therapy
5\. LVAD support is intended for bridge-to transplant. Subject is listed for transplant or eligible (i.e., no medical or surgical contraindications) to be listed for cardiac transplant, United Network for Organ Sharing (UNOS) status 1A, or equivalent 6. Implant performed at a US or European site participating in the Jarvik 2015 IDE Pivotal Trial.
7\. Written consent of parent(s) or legally authorized representative (LAR) where appropriate.
Exclusion Criteria:1. Severe right ventricular (RV) dysfunction or significant arrhythmia where treatment with a durable RV assist device (RVAD) (i.e., biventricular assist device) is definite or highly likely. 2. Complex cardiac anatomy including but not limited to:
1. Single ventricle anatomy
2. Presence of a mechanical heart valve
3. Unrepairable severe aortic insufficiency 3. Stable inotrope dependence (INTERMACS profile 3) 4. Severe or irreversible renal dysfunction, liver dysfunction or pulmonary dysfunction. 5. Known contraindication to systemic anticoagulation (e.g., coagulopathy) 6. CPR with duration \>30 consecutive minutes within 48 hours prior to device implant or CPR with uncertain neurological status 7. ECMO use for \>10 consecutive days 8. Known cerebrovascular event within the past 30 days or uncertain neurological status 9. Unmanageable bleeding per judgment of the investigator 10. Ventricular dysfunction that is likely to recover (e.g., acute myocarditis, metabolic myopathy where LV dysfunction is present solely with intermittent acidosis/crises).
11\. A non-dilated LV as determined by a left ventricular end-diastolic dimension or left ventricular end-diastolic volume z score of \<+2.5 12. Systolic dysfunction that is not severe (LV ejection fraction of \>35%) (e.g., heart failure with preserved ejection fraction, aka primary diastolic dysfunction). 12. Unresolved malignancy 13. Active, systemic infection unresponsive to antimicrobials therapy 14. Currently participating in an interventional trial whose protocol prevents effective application of the Jarvik 2015 device, potentially has an independent effect on trial endpoints, or otherwise interferes with execution of the PumpKIN protocol
