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Thoratec HeartMate II Left Ventricular Assist System (LVAS) for Bridge to Cardiac Transplantation

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00121472
Recruitment Status : Completed
First Posted : July 21, 2005
Results First Posted : March 19, 2013
Last Update Posted : June 27, 2022
Thoratec Corporation
Information provided by (Responsible Party):
Abbott Medical Devices

Brief Summary:

The purpose of this study is to determine the safety and effectiveness of the Thoratec HeartMate II Left Ventricular Assist System (LVAS) as a bridge to cardiac transplantation in end-stage heart failure patients who are listed for cardiac transplant but are at imminent risk of dying.

The HeartMate II LVAS was approved by the US FDA on April 21, 2008, as a bridge to cardiac transplantation (reference PMA P060040). It was approved for commercial distribution in Canada on May 20, 2009 (reference Medical Device Licence #79765). Patients enrolled into the clinical trial will continue to be followed until all have reached a clinical outcome.

Condition or disease Intervention/treatment Phase
Heart Failure, Congestive Ventricular Dysfunction Cardiomyopathies Device: Thoratec HeartMate II Left Ventricular Assist System (LVAS) Not Applicable

Detailed Description:
The HeartMate II is a high speed, electric, axial flow, rotary blood pump. The pump drains blood from the left ventricular apex via a rigid inlet cannula and ejects into the aortic root via an outflow cannula joined to the aorta with an end to side anastomosis. Power and control of the pump are delivered through a percutaneous cable from the pump to the belt-worn System Driver. Patient outcomes will be compared to objective performance criteria based on historical data from other Thoratec implantable ventricular assist devices.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 194 participants
Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: The HeartMate II LVAS Pivotal Study Protocol, Bridge to Cardiac Transplantation
Study Start Date : March 2005
Actual Primary Completion Date : November 2006
Actual Study Completion Date : May 2010

Resource links provided by the National Library of Medicine

Intervention Details:
  • Device: Thoratec HeartMate II Left Ventricular Assist System (LVAS)
    Implantation of ventricular assist device to provide hemodynamic support
    Other Names:
    • Thoratec
    • HeartMate II
    • Ventricular assist

Primary Outcome Measures :
  1. Survival [ Time Frame: 180 days ]
    Survival to cardiac transplantation or 180 days on left ventricular assist system (LVAS) support while remaining listed for cardiac transplantation as United Network for Organ Sharing (UNOS)status 1A or 1B (please refer to for complete definitions of status).

Secondary Outcome Measures :
  1. Clinical Reliability (Malfunctions/Failures) [ Time Frame: continuous ]
    Confirmed malfunctions/Serious Adverse Events

  2. Kansas City Cardiomyopathy Questionaire (KCCQ) [ Time Frame: baseline to 6 months ]
    KCCQ is a validated instrument to self assess quality of life including physical function and social function. The instrument provides two scores, the Overall Summary (OSS) and Clinical Summary (CSS). Scores are calculated based on responses to the questionnaire, on a scale from 0-100. The higher the score, the better the quality of life. The patients' scores at six months were compared to their baseline scores and the resulting positive scores indicated improved quality of life.

  3. New York Heart Association (NYHA) Classification [ Time Frame: baseline, 1 month, 3 months, 6 months ]
    NYHA relates symptoms to every day activities and patients quality of life. Class 1 = no limitations on physical activity Class 2 - slight limitation of physical activity Class 3 - marked limitation of physical activity Class 4 = unable to carry out any physical activity without discomfort

  4. Minnesota Living With Heart Failure Questionnaire (MLWHF) [ Time Frame: Baseline to 6 months ]
    MLWHF is a validated instrument to self assess how heart failure and its treatment affect the key physical, emotional, social and psychological dimensions of quality of life. The instrument is made up of 21 items that assess the patient's perception of these dimensions on a scale ranging from no (0) to very much (5). The total MLWHF score is calculated by adding the scores for all 21 items (range, 0-105). A lower score indicates a better quality of life. The patients' score at six months was compared to their baseline score and the resulting negative score indicates improved quality of life.

  5. Six Minute Walk Test (6MWT) [ Time Frame: baseline to 6 months ]
    The Six Minute Walk Test(6MWT)measures the distance that a patient can walk in a period of 6 minutes. The distance walked is measured in meters. This test measures the patients' functional status. The more meters a patient can walk over baseline indicates improvement in functional status.

  6. Reoperations [ Time Frame: continuous ]
    Additional surgery after the initial implant operation

  7. Post-transplant Survival [ Time Frame: 30 days, 1 year ]
    30 day and 1 year post transplant survival

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   Child, Adult, Older Adult
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

The following are general criteria; more specific conditions are included in the study protocol:

  • Listed for cardiac transplantation
  • NYHA Class IV heart failure symptoms
  • On inotropic support, if tolerated
  • Despite medical therapy, the patient must meet hemodynamic criteria for cardiogenic shock

Exclusion Criteria:

The following are general criteria; more specific conditions are included in the study protocol:

  • Evidence of, or risk factors for end-organ dysfunction that would make LVAS implantation futile
  • Existence of factors that would adversely affect patient survival or function of the LVAS.
  • Intolerance to anticoagulant or antiplatelet therapies.
  • Existence of any ongoing mechanical circulatory support other than intra-aortic balloon counterpulsation.
  • Participation in any other clinical investigation that is likely to confound study results or affect study outcome.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00121472

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Sponsors and Collaborators
Abbott Medical Devices
Thoratec Corporation
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Study Director: Pooja Chatterjee Thoratec Corporation
Publications of Results:
Publications automatically indexed to this study by Identifier (NCT Number):
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Responsible Party: Abbott Medical Devices Identifier: NCT00121472    
Other Study ID Numbers: TC010230-1
First Posted: July 21, 2005    Key Record Dates
Results First Posted: March 19, 2013
Last Update Posted: June 27, 2022
Last Verified: June 2022
Keywords provided by Abbott Medical Devices:
Heart-assist devices
Additional relevant MeSH terms:
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Heart Failure
Ventricular Dysfunction
Heart Diseases
Cardiovascular Diseases