[en] Lumped parameter approaches for modelling the cardiovascular system typically have many parameters of which a significant percentage are often not identifiable from limited data sets. Hence, significant parts of the model are required to be simulated with little overall effect on the accuracy of data fitting, as well as dramatically increasing the complexity of parameter identification. This separates sub-structures of more complex cardiovascular system models to create uniquely identifiable simplified models that are one to one with the measurements. In addition, a new concept of parameter identification is presented where the changes in the parameters are treated as an actuation force into a feed back control system, and the reference output is taken to be steady state values of measured volume and pressure. The major advantage of the method is that when it converges, it must be at the global minimum so that the solution that best fits the data is always found. By utilizing continuous information from the arterial/pulmonary pressure waveforms and the end-diastolic time, it is shown that potentially, the ventricle volume is not required in the data set, which was a requirement in earlier published work. The simplified models can also act as a bridge to identifying more sophisticated cardiac models, by providing an initial set of patient specific parameters that can reveal trends and interactions in the data over time. The goal is to apply the simplified models to retrospective data on groups of patients to help characterize population trends or un-modelled dynamics within known bounds. These trends can assist in improved prediction of patient responses to cardiac disturbance and therapy intervention with potentially smaller and less invasive data sets. In this way a more complex model that takes into account individual patient variation can be developed, and applied to the improvement of cardiovascular management in critical care.
Disciplines :
Physics
Author, co-author :
Hann, C. E.
Chase, J. G.
Desaive, Thomas ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Thermodynamique des phénomènes irréversibles - Département d'astrophys., géophysique et océanographie (AGO)
Froissart, C. B.
Revie, J.
Stevenson, D.
Lambermont, Bernard ; Centre Hospitalier Universitaire de Liège - CHU > Frais communs médecine
Ghuysen, Alexandre ; Université de Liège - ULiège > Département des sciences de la santé publique > Réanimation - Urgence extrahospitalière
Kolh, Philippe ; Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Biochimie et physiologie générales, humaines et path.
Shaw, G. M.
Language :
English
Title :
Unique parameter identification for cardiac diagnosis in critical care using minimal data sets.
Publication date :
2010
Journal title :
Computer Methods and Programs in Biomedicine
ISSN :
0169-2607
eISSN :
1872-7565
Publisher :
Elsevier Scientific, Limerick, Ireland
Volume :
99
Issue :
1
Pages :
75-87
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
Copyright (c) 2010 Elsevier Ireland Ltd. All rights reserved.
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