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Extracorporeal circulation during on‐pump cardiac surgery: An evaluation of the energy equivalent pressure index based on waveforms decomposition in harmonics
Author(s) -
Drochon Agnès,
Fouquet Olivier,
Baufreton Christophe
Publication year - 2021
Publication title -
artificial organs
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.684
H-Index - 76
eISSN - 1525-1594
pISSN - 0160-564X
DOI - 10.1111/aor.13928
Subject(s) - pulsatile flow , harmonics , extracorporeal circulation , cardiology , extracorporeal , waveform , flow (mathematics) , perfusion , cardiopulmonary bypass , medicine , signal (programming language) , energy (signal processing) , biomedical engineering , mechanics , voltage , mathematics , computer science , physics , electrical engineering , statistics , engineering , programming language
Abstract The use of pulsatile perfusion instead of nonpulsatile perfusion during cardiopulmonary bypass continues to be a source of debate. The disagreements among the conclusions of the published studies may be due to different factors: differences in the type of patients included in the studies, differences in the protocol of the studies, and difficulty to quantify the pulsatility of the flow. In the present paper, we propose a quantitative evaluation of Shepard's energy equivalent pressure index, based on the harmonic decomposition of the physiological aortic pressure and flow rate signal. It is thus demonstrated that the surplus energy provided by pulsatile flow remains moderate (of order 10 mm Hg), but that it can be improved by changing the relative shapes of the pressure and flow waves.