A new method for temporary left ventricular bypass. Preclinical appraisal.

Area of Science:

• Cardiovascular Surgery
• Biomedical Engineering
• Mechanical Circulatory Support

Background:

• Patients unable to wean from cardiopulmonary bypass or with balloon-dependent left ventricular failure face dire prognoses.
• Potentially reversible ventricular dysfunction offers a window for recovery with effective temporary circulatory support.

Purpose of the Study:

• To develop and evaluate a novel pneumatically actuated left ventricular assist pump for temporary circulatory support.
• To assess the feasibility of the device for potential human investigation.

Main Methods:

• A flexible polyurethane pumping chamber device was connected to the left ventricular apex and descending thoracic aorta in 20 calves.
• The device was implanted via midline sternotomy in a series of autopsies as a prelude to human trials.

Main Results:

• All 20 animals survived the 14 to 30-day pumping interval.
• Seven animals underwent successful device removal.
• Autopsy implantations demonstrated feasibility for human application.

Conclusions:

• The developed left ventricular assist pump shows promise as a temporary circulatory support system.
• The device's design and implantation methods are suitable for further investigation in human patients.
• This technology may offer a life-saving option for surgical patients with severe, potentially reversible, left ventricular failure.