DocumentCode :
636202
Title :
Assessment of conceptual inconsistencies in the hybrid reservoir-wave model
Author :
Mynard, Jonathan P.
Author_Institution :
Heart Res. Group, Murdoch Childrens Res. Inst., Parkville, VIC, Australia
fYear :
2013
fDate :
3-7 July 2013
Firstpage :
213
Lastpage :
216
Abstract :
The reservoir-wave paradigm separates pressure into windkessel-related `reservoir´ and wave-related `excess´ components, however the conceptual validity of this approach has not been sufficiently scrutinized. This paper assesses two logical implications of the reservoir-wave concept. First, parameters defining the reservoir (resistance and compliance) should be independent of wave effects. Second, wave analysis performed using excess pressure should provide a more accurate and physically intuitive representation of wave propagation and reflection in a vascular system, compared with the traditional wave analysis based on unseparated pressure. These issues were investigated with one-dimensional numerical models. Using a single vessel model, reservoir parameters were shown to be highly influenced by wave propagation effects. In a single bifurcation model, wave analysis based on excess pressure underestimated the reflection coefficient of the known impedance mismatch at the junction, overestimated the distance to this reflection site, and exhibited backward expansion waves suggestive of multiple negative impedance mismatches that did not exist in the system. Traditional wave analysis accurately and intuitively described waves. The identified conceptual inconsistencies in the reservoir-wave paradigm may arise from the use of hybrid (0D and 1D) dimensionality, rather than a hierarchical approach to model dimensionality.
Keywords :
bifurcation; blood vessels; haemodynamics; reduced order systems; wave propagation; compliance; haemodynamics; hybrid reservoir-wave model; impedance mismatch; one-dimensional numerical models; reflection coefficient; resistance; single bifurcation model; single vessel model; vascular system; wave analysis; wave propagation; wave reflection; Analytical models; Bifurcation; Mathematical model; Numerical models; Propagation; Reservoirs; Resistance;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Engineering in Medicine and Biology Society (EMBC), 2013 35th Annual International Conference of the IEEE
Conference_Location :
Osaka
ISSN :
1557-170X
Type :
conf
DOI :
10.1109/EMBC.2013.6609475
Filename :
6609475
Link To Document :
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