A Clinical Trial to Evaluate the HeartWare™ Ventricular Assist System (ENDURANCE SUPPLEMENTAL TRIAL)

Inclusion Criteria: 1. Must be ≥18 years of age at consent 2. Body Surface Area (BSA) ≥ 1.2 m2 3. Patients with advanced heart failure symptoms (Class IIIB or IV) who are: (patient must meet one of the following)a. On optimal medical management, including dietary salt restriction and diuretics, for at least 45 out of the last 60 days and are failing to respond; or b. In Class III or Class IV heart failure for at least 14 days, and dependent on intra-aortic balloon pump (IABP) for 7 days and/or inotropes for at least 14 days 4. Left ventricular ejection fraction ≤ 25% 5. LVAD implant is intended as destination therapy 6. Must be able to receive either the HeartWare® HVAD or control LVAD 7. Patient must agree to participate in and comply with an improved blood pressure management program, including maintenance of a patient diary. 8. Female patients of childbearing potential must agree to use adequate contraceptive precautions (defined as oral contraceptives, intrauterine devices, surgical contraceptives or a combination of condom and spermicide) for the duration of the study. 9. The patient or legally authorized representative has signed the informed consent form Exclusion Criteria: 1. Body Mass Index (BMI) \> 40 2. Existence of any ongoing mechanical circulatory support (MCS) other than an intra-aortic balloon pump (IABP) 3. Prior cardiac transplant. 4. History of confirmed, untreated abdominal or thoracic aortic aneurysm \> 5 cm. 5. Cardiothoracic surgery within 30 days of randomization. 6. Acute myocardial infarction within 14 days of implant as diagnosed by ST or T wave changes on the ECG, diagnostic biomarkers, ongoing pain and hemodynamic abnormalities as described (Figure 2) in the guidelines published in ACC/AHA 2007 Guidelines for the Management of Patients with Unstable Angina/Non-ST-Elevation Myocardial Infarction ;. 7. Patients eligible for cardiac transplantation 8. On ventilator support for \> 72 hours within the four days immediately prior to randomization and implant. 9. Pulmonary embolus within three weeks of randomization as documented by computed tomography (CT) scan or nuclear scan. 10. Symptomatic cerebrovascular disease, stroke within 180 days of randomization or \> 80% stenosis of carotid or cranial vessels. 11. Uncorrected moderate to severe aortic insufficiency. Correction may include repair or bioprosthesis at the time of implant. 12. Severe right ventricular failure as defined by the anticipated need for right ventricular assist device (RVAD) support or extracorporeal membrane oxygenation (ECMO) at the time of screening/randomization or right atrial pressure \> 20 mmHg on multiple inotropes or right ventricular ejection fraction (RVEF) \<15% with clinical signs of severe right heart failure (e.g. Lower extremity edema, ascites or pleural effusions refractory to treatment with diuretics and two inotropic drugs). 13. Active, uncontrolled infection diagnosed by a combination of clinical symptoms and laboratory testing, including but not limited to, continued positive cultures, elevated temperature and white blood cell (WBC) count, hypotension, tachycardia, generalized malaise despite appropriate antibiotic, antiviral or antifungal treatment. 14. Uncorrected thrombocytopenia or generalized coagulopathy (e.g., platelet count \< 75,000, INR \> 2.0 or PTT \> 2.5 times control in the absence of anticoagulation therapy). 15. Intolerance to anticoagulant or antiplatelet therapies or any other peri- or postoperative therapy that the investigator may administer based upon the patient's health status. 16. Serum creatinine \> 3.0 mg/dL within 72 hours of randomization or requiring dialysis or ultrafiltration. 17. Specific liver enzymes \[AST (SGOT) and ALT (SGPT\] \> 3 times upper limit of normal within 72 hours of randomization. 18. A total bilirubin \> 3 mg/dl within 72 hours of randomization, or biopsy proven liver cirrhosis or portal hypertension. 19. Pulmonary vascular resistance is demonstrated to be unresponsive to pharmacological manipulation and the PVR \> 6 Wood units. 20. Patients with a mechanical heart valve. 21. Etiology of heart failure is due to, or associated with, uncorrected thyroid disease, obstructive cardiomyopathy, pericardial disease, amyloidosis, active myocarditis or restrictive cardiomyopathy 22. History of severe COPD or severe restrictive lung disease (e.g. FEV1 \<50%) 23. Participation in any other study involving investigational drugs or devices 24. Severe illness, other than heart disease, which would limit survival to \< 3 years 25. Peripheral vascular disease with rest pain or ischemic ulcers of the extremities 26. Pregnancy 27. Patient unwilling or unable to comply with study requirements 28. Technical obstacles, which pose an inordinately high surgical risk, in the judgment of the investigator