Rotary blood pump control strategy for preventing left ventricular suction

Area of Science:

• Biomedical Engineering
• Cardiovascular Physiology
• Medical Devices

Background:

• Left ventricular (LV) suction is a critical risk during continuous flow LV assist device (LVAD) support, potentially compromising adequate organ perfusion.
• Maintaining stable hemodynamic function under varying physiological conditions remains a significant challenge in current LVAD therapy.

Purpose of the Study:

• To develop and evaluate a novel Suction Prevention and Physiologic Control (SPPC) algorithm for axial and centrifugal LVADs.
• To ensure prevention of LV suction while maintaining physiologic perfusion across a range of simulated conditions.

Main Methods:

• The SPPC algorithm was designed using two gain-scheduled, proportional-integral controllers to manage differential pump speed (ΔRPM) and differential pressure (ΔP).
• In silico simulations were performed under rest and exercise conditions, including excessive setpoint (ES) and increased pulmonary vascular resistance (PVR), to test algorithm efficacy and robustness.
• Hemodynamic parameters including LV pressure/volume and aortic pressure/flow were analyzed to assess suction events and overall device performance.

Main Results:

• The SPPC algorithm successfully prevented LV suction in all simulated scenarios.
• Physiologic perfusion was maintained throughout the simulations, demonstrating the algorithm's effectiveness under challenging conditions.
• The algorithm showed robustness against excessive setpoints and significant increases in pulmonary vascular resistance.

Conclusions:

• The developed SPPC algorithm is a promising solution for preventing LV suction in LVAD patients.
• The algorithm's ability to maintain adequate perfusion supports its potential for clinical application.
• Further in vivo investigation is warranted to validate the efficacy and safety of the SPPC algorithm in clinical settings.