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Development of a direct mechanical left ventricular assist device for left ventricular failure
1First Department of Surgery, Hiroshima University School of Medicine, Japan.
Artificial Organs
|September 1, 1997
Summary
A novel direct mechanical left ventricular assist device (DMLVAD) shows promise for severe left ventricular failure. This device significantly improved cardiac output and hemodynamic function in preclinical models, offering a potential option for heart transplant candidates.
Area of Science:
- Cardiovascular Engineering
- Biomedical Devices
- Mechanical Circulatory Support
Background:
- Severe left ventricular failure presents a critical unmet need for effective mechanical circulatory support.
- Current assist devices have limitations, necessitating innovative solutions.
- The development of novel devices is crucial for improving outcomes in patients awaiting heart transplantation.
Purpose of the Study:
- To develop and evaluate a direct mechanical left ventricular assist device (DMLVAD) for patients with severe left ventricular failure.
- To assess the efficacy of the DMLVAD in improving cardiac output and hemodynamic parameters.
- To determine optimal operating conditions for the DMLVAD.
Main Methods:
- Development of a direct mechanical left ventricular assist device (DMLVAD) utilizing a pneumatic driving unit.
- In vitro testing in a mock circulation model with an extracted nonbeating heart to measure cardiac output.
- In vivo testing in a canine model of induced left ventricular failure to assess hemodynamic improvements.
Main Results:
- The DMLVAD achieved a cardiac output of 1.93 L/min at 200 mm Hg driving pressure in a mock circulation model.
- In canine models, the DMLVAD significantly increased systolic arterial pressure (21%), systolic left ventricular pressure (24%), maximum LV dP/dt (58%), peak flow (144%), and cardiac output (37%).
- Mean left atrial pressure decreased by 15%, with optimal performance observed at mean left atrial pressure >15 mm Hg and driving pressure >100 mm Hg, particularly with late systolic compression.
Conclusions:
- The direct mechanical left ventricular assist device (DMLVAD) effectively augments cardiac function in preclinical models of left ventricular failure.
- The DMLVAD demonstrates potential as an optional circulatory assist device for patients with severe left ventricular failure awaiting heart transplantation.
- Further investigation into DMLVAD performance and clinical application is warranted.