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Improved left ventricular function after chronic left ventricular unloading

O H Frazier1, C R Benedict, B Radovancevic

  • 1Division of Cardiopulmonary Transplantation, Texas Heart Institute at St. Luke's Episcopal Hospital, Houston, USA.

The Annals of Thoracic Surgery
|September 1, 1996
PubMed
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Prolonged use of the HeartMate left ventricular assist system improved native heart function and reduced heart size. This suggests potential benefits of device removal without transplantation in select patients.

Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Heart Failure Management

Background:

  • Assessing the impact of sustained left ventricular unloading on native ventricular function.
  • Investigating the long-term effects of mechanical circulatory support on myocardial recovery.

Purpose of the Study:

  • To evaluate the functional recovery of the native left ventricle after prolonged support with the HeartMate ventricular assist device.
  • To determine if native ventricular function improves sufficiently for potential device explantation.

Main Methods:

  • Retrospective analysis of 31 patients receiving HeartMate support for over 30 days.
  • Collection of anatomical, physiological, hemodynamic, histological, and biochemical data at implantation, during temporary device weaning, and at explantation.

Related Experiment Videos

  • Utilizing chest roentgenography, echocardiography, and tissue sample analysis.

    • Main Results:

    • Significant reduction in cardiothoracic ratio and left ventricular end-diastolic dimension.
    • Marked improvement in ejection fraction and cardiac index.
    • Normalization of myocardial histology, calcium handling, lipid levels, and plasma norepinephrine.

    Conclusions:

    • Prolonged left ventricular unloading with the HeartMate system leads to significant improvements in native ventricular function.
    • These findings support the need for prospective studies on the feasibility of device removal without transplantation in carefully selected patients.