Transapical left ventricular bypass (TALVB) without an auxiliary ventricle

Area of Science:

• Biomedical Engineering
• Cardiovascular Research
• Medical Device Development

Background:

• Developing effective circulatory support systems is crucial for managing severe heart conditions.
• Existing systems may have limitations in terms of invasiveness, blood compatibility, and long-term usability.
• Minimally invasive approaches for cardiac support are highly desirable.

Purpose of the Study:

• To develop and evaluate a simple transapical left ventricular bypass system.
• To assess the system's ability to provide continuous partial or total circulatory support.
• To evaluate blood compatibility and potential complications associated with long-term use.

Main Methods:

• A transapical left ventricular bypass system was designed using a roller pump, transapical catheter, and outflow filter.
• The system was evaluated in unanesthetized sheep for periods exceeding two weeks.
• Histological analysis was performed to assess myocardial and catheter-related changes.

Main Results:

• The system successfully provided continuous partial left ventricular bypass and could totally maintain circulation.
• Minimal blood damage was observed, and no blood transfusions were required.
• Long-term (over 4 months) catheter placement in the LV apex led to thrombus formation and myocardial histological changes.

Conclusions:

• The developed transapical left ventricular bypass system is effective for circulatory support in sheep.
• The system demonstrates good blood compatibility for short-to-medium term use.
• Further research is needed regarding catheter removal timing or the necessity of long-term anticoagulation to mitigate adverse effects.