In-silico evaluation of left ventricular unloading under varying speed continuous flow left ventricular assist device support

• Autorzy: Bozkurt S. , Bozkurt S.

Identyfikatory

DOI

10.1016/j.bbe.2017.03.003

• Języki publikacji: EN

Abstrakty

EN

Continuous flow left ventricular assist device (cf-LVAD) operating speed modulation techniques are proposed to achieve different purposes such as improving arterial pulsatility, aortic valve function or ventricular unloading etc. Although it is possible to improve the left ventricular unloading by modulating the operating speed of a cf-LVAD, it is still unclear what type of pump operating mode should be applied to generate a better left ventricular unloading. This study presents a comparison of different heart pump support modes including constant speed support, copulsative and counterpulsative direct cf-LVAD speed modulation and pump flow rate control to regulate the cf-LVAD operating speed. The simulations were performed using a cardiovascular system model, which consists of active left atrium and ventricle, mitral and aortic valve leaflets, circulatory loop and a cf-LVAD. The cf-LVAD was operated between 7500 rpm and 12,500 rpm with 1000 rpm intervals to simulate constant speed support. The same mean pump operating speeds over a cardiac cycle were applied in the direct operating speed modulation for the copulsative and counterpulsative direct speed modulation cf-LVAD support as in the constant speed support while the same pump-output over a cardiac cycle was applied to drive the pump in flow rate controlled copulsative and counterpulsative cf-LVAD support modes as in the constant speed support. Simulation results show that flow rate controlled counterpulsative pump support mode generates lower end-diastolic left ventricular volume and pressure–volume loop area while generating more physiological left ventricular volume signals over a cardiac cycle with respect to the other pump operating modes.

Słowa kluczowe

EN

left ventricular unloading; cf-LVAD; flow rate control

PL

komora serca; komora lewa; cf-LVAD; kontrola szybkości przepływu

• Wydawca: Nałęcz Institute of Biocybernetics and Biomedical Engineering of the Polish Academy of Sciences ; Elsevier
• Czasopismo: Biocybernetics and Biomedical Engineering
• Rocznik: 2017
• Tom: Vol. 37, no. 3
• Strony: 373--387
• Opis fizyczny: Biblioge. 62 poz., rys., tab., wykr.

Twórcy

autor

Bozkurt S.

• University College London, Department of Mechanical Engineering, Torrington Place, London WC1E 7 JE, United Kingdom

autor

Bozkurt S.

• Yeditepe University, Department of Electrical & Electronics Engineering, Istanbul, Turkey

Bibliografia

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Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).