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dc.contributor.authorLiao, Sam
dc.contributor.authorWu, Eric L
dc.contributor.authorNeidlin, Michael
dc.contributor.authorLi, Zhiyong
dc.contributor.authorSimpson, Benjamin
dc.contributor.authorGregory, Shaun D
dc.date.accessioned2019-12-11T06:26:07Z
dc.date.available2019-12-11T06:26:07Z
dc.date.issued2018
dc.identifier.issn0160-564X
dc.identifier.doi10.1111/aor.13330
dc.identifier.urihttp://hdl.handle.net/10072/389676
dc.description.abstractRotary left ventricular assist devices (LVADs) are commonly operated at a constant speed, attenuating blood flow pulsatility. Speed modulation of rotary LVADs has been demonstrated to improve vascular pulsatility and pump washout. The effect of LVAD speed modulation on intraventricular flow dynamics is not well understood, which may have an influence on thromboembolic events. This study aimed to numerically evaluate intraventricular flow characteristics with a speed modulated LVAD. A severely dilated anatomical left ventricle was supported by a HeartWare HVAD in a three-dimensional multiscale computational fluid dynamics model. Three LVAD operating scenarios were evaluated: constant speed and sinusoidal co- and counter-pulsation. In all operating scenarios, the mean pump speed was set to restore the cardiac output to 5.0 L/min. Co- and counter-pulsation was speed modulated with an amplitude of 750 rpm. The risk of thrombosis was evaluated based on blood residence time, ventricular washout, kinetic energy densities, and a pulsatility index map. Blood residence time for co-pulsation was on average 1.8 and 3.7% lower than constant speed and counter-pulsation mode, respectively. After introducing fresh blood to displace preexisting blood for 10 cardiac cycles, co-pulsation had 1.5% less old blood in comparison to counter-pulsation. Apical energy densities were 84 and 27% higher for co-pulsation in comparison to counter-pulsation and constant speed mode, respectively. Co-pulsation had an increased pulsatility index around the left ventricular outflow tract and mid-ventricle. Improved flow dynamics with co-pulsation was caused by increased E-wave velocities which minimized blood stasis. In the studied scenario and from the perspective of intraventricular flow dynamics, co-pulsation of rotary LVADs could minimize the risk of intraventricular thrombosis.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherWiley Blackwell
dc.relation.ispartofpagefrom943
dc.relation.ispartofpageto953
dc.relation.ispartofissue10
dc.relation.ispartofjournalArtificial Organs
dc.relation.ispartofvolume42
dc.subject.fieldofresearchBiomedical engineering
dc.subject.fieldofresearchClinical sciences
dc.subject.fieldofresearchcode4003
dc.subject.fieldofresearchcode3202
dc.subject.keywordsScience & Technology
dc.subject.keywordsTechnology
dc.subject.keywordsLife Sciences & Biomedicine
dc.subject.keywordsEngineering, Biomedical
dc.subject.keywordsTransplantation
dc.titleThe Influence of Rotary Blood Pump Speed Modulation on the Risk of Intraventricular Thrombosis
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationLiao, S; Wu, EL; Neidlin, M; Li, Z; Simpson, B; Gregory, SD, The Influence of Rotary Blood Pump Speed Modulation on the Risk of Intraventricular Thrombosis, Artificial Organs, 2018, 42 (10), pp. 943-953
dc.date.updated2019-12-11T06:22:59Z
dc.description.versionAccepted Manuscript (AM)
gro.rights.copyright© 2018 International Center for Artificial Organs and Transplantation and Wiley Periodicals, Inc. This is the peer reviewed version of the following article: The Influence of Rotary Blood Pump Speed Modulation on the Risk of Intraventricular Thrombosis, Artificial Organs, Volume 42, Issue 10, Pages 943-953, 2018, which has been published in final form at https://doi.org/10.1111/aor.13330. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving (http://olabout.wiley.com/WileyCDA/Section/id-828039.html)
gro.hasfulltextFull Text
gro.griffith.authorGregory, Shaun D.
gro.griffith.authorSimpson, Benjamin A.


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