Reliability of left atrial pressure estimation from left ventricular filling measurement in a total artificial heart

M. Diedrich, U. Steinseifer, T. Schmitz-Rode, F. Risvanis, J. Arens, B. Kirn

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

A physiological control of a total artificial heart (TAH) requires reliable information on left arterial pressure (LAP). When LAP is derived indirectly from intrinsic TAH parameters like end diastolic volume (EDV) and diastole duration (Td), the transfer function and associated uncertainties need to be well understood.We derived a computational equivalent to a hydraulic model consisting of the venous compliance, the heart valve and the pump chamber, and studied the filling phase in cases of different venous compliance. We calculated a family of curves of pump chamber volume as a function of time for different venous compliances and LAP. To visualize the LAP transfer function and uncertainties associated to EDV, Td measurement error and unknown venous compliance a family of similar curves in the vicinity of assumed measurement was found and visualised in the parameter space.Results were in a realistic absolute range and showed expected trends despite some simplifications in the simulation model. The venous compliance has no significant influence on LAP values extracted from EDV and Td, except at very low values. The uncertainty in the extracted LAP is particularly high for high EDV and short Td.A physiological regulation therefore does not have to be individually adapted to the patient's venous compliances, but has to deal with uncertainties in the input values like blood pressures extracted from intrinsic device parameters.

Original languageEnglish
Title of host publication2019 41st Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2019
PublisherIEEE
Pages4905-4908
Number of pages4
ISBN (Electronic)9781538613115
DOIs
Publication statusPublished - 7 Oct 2019
Event41st International Engineering in Medicine and Biology Conference, EMBC 2019: Biomedical Engineering Ranging from Wellness to Intensive Care Medicine - CityCube Berlin, Berlin, Germany
Duration: 23 Jul 201927 Jul 2019
Conference number: 41
https://embc.embs.org/2019/

Conference

Conference41st International Engineering in Medicine and Biology Conference, EMBC 2019
Abbreviated titleEMBC
CountryGermany
CityBerlin
Period23/07/1927/07/19
Internet address

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