Assessment of the VAD – Native ventricle pumping system by an equivalent pump: A computational model based procedure

• Autorzy: Ferrari Gianfranco , Di Molfetta Arianna , Zieliński Krzysztof , Cusimano Valerio , Darowski Marek , Kozarski Maciej , Fresiello Libera

Identyfikatory

DOI

10.1016/j.bbe.2021.05.006

• Języki publikacji: EN

Abstrakty

EN

Objectives: To assess the interaction between a continuous flow pump (CFP) and the native ventricle (NV) when both pumps are giving a flow contribution. Methods and results: The pumping system, composed of NV and of CFP, is replaced by an equivalent pump (EP) with the same NV filling characteristics and heart rate. It is assumed that EP cardiac output is equal to the sum of NV and CFP flows and that its E_max is correlated to the CFP pump speed. Both the pumping system and EP are addressed with a closed loop lumped parameters cardiovascular model connected to a Heart Mate II (HM-II) CFP. The experiments were performed to: 1: verify EP E_max correlation with CFP speed. Resulting correlation:~0.98; 2: verify EP parameters calculation accuracy, in comparison with the pumping system parameters for different values of peripheral resistance, E_{max_NV}, HR and CFP speed (8000–11000 RPM). Resulting average error: less than 4%; 3: show how EP can be used to obtain the desired haemodynamic or energetic conditions, then feeding the results into the pumping system, so as to regulate CFP speed accordingly. Conclusions: EP merges the properties of the pumping system composed of NVand CFP into a single pulsatile pump. The described methodology can be a useful support to optimise both haemodynamic and energetic variables in the pumping system when, with the simultaneous presence of CFP and NV flows, flow distribution between the two pumps becomes a critical issue.

Słowa kluczowe

EN

mechanical circulatory assistance; ventricular elastance; circulatory model; end-systolic pressure; equivalent pump; lumped parameters model

PL

mechaniczne wspomaganie krążenia; elastyczność tętnicza; model krążeniowy; pompa równoważna

• Wydawca: Nałęcz Institute of Biocybernetics and Biomedical Engineering of the Polish Academy of Sciences ; Elsevier
• Czasopismo: Biocybernetics and Biomedical Engineering
• Rocznik: 2021
• Tom: Vol. 41, no. 4
• Strony: 1365--1377
• Opis fizyczny: Bibliogr. 38 poz., rys., tab., wykr.

Twórcy

autor

Ferrari Gianfranco

• Nałecz Institute of Biocybernetics and Biomedical Engineering, Trojdena 4, 02-109 Warsaw, Poland

autor

Di Molfetta Arianna

• Department of Cardiac Surgery, Policlinico Gemelli Hospital, Rome, Italy

autor

Zieliński Krzysztof

• Nałecz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland

autor

Cusimano Valerio

• Institute for System Analysis and Computer Science ‘‘Antonio Ruberti”, National Research Council, Rome, Italy

autor

Darowski Marek

• Nałecz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland

autor

Kozarski Maciej

• Nałecz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland

autor

Fresiello Libera

• Department of Cardiovascular Sciences, Cardiac Surgery, Katholieke Universiteit Leuven, Leuven, Belgium; Institute of Clinical Physiology, National Research Council, Pisa, Italy

Bibliografia

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