Recovery directed left ventricular assist device: a new concept

Area of Science:

• Cardiovascular Science
• Biomedical Engineering
• Medical Devices

Background:

• Ischemia-induced heart failure significantly impairs left ventricular function.
• Current left ventricular assist devices (LVADs) may not fully optimize cardiac recovery.
• There is a need for advanced LVADs that promote myocardial recovery.

Purpose of the Study:

• To develop and evaluate a novel recovery directed left ventricular assist device (RDLVAD).
• To compare the efficacy of RDLVAD with an ordinary LVAD in promoting cardiac recovery.
• To assess the impact of RDLVAD on left ventricular function and hemodynamics.

Main Methods:

• Development of an RDLVAD comprising a valved apical conduit, an afterload controlling chamber (ACC), and a pump.
• Comparative efficacy study in six pigs with ischemia-induced heart failure.
• In vivo measurements of cardiac output, pressures, and derived indices (DPTI/SPTI) under controlled conditions.

Main Results:

• RDLVAD successfully directed all left ventricular (LV) ejected blood into the ACC with low pressure (0-15 mm Hg).
• Compared to ordinary LVAD, RDLVAD significantly increased DPTI/SPTI by 2.3 times (p < 0.005).
• RDLVAD reduced left ventricular end-diastolic pressure by 40% and maximum dP/dt by 20% (p < 0.05), indicating reduced LV workload.

Conclusions:

• RDLVAD facilitates complete ventricular emptying into the ACC, promoting relaxation and reducing myocardial work.
• The device enhances coronary perfusion by increasing the diastolic pressure-time index/systolic pressure-time index ratio.
• RDLVAD shows potential for promoting cardiac recovery in heart failure patients.