| Non-invasive flow measurement of a rotary pump ventricular assist device using quantitative contrast echocardiography. | |
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MedLine Citation:
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PMID: 20206830 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND: Many implantable ventricular assist devices (VADs) have no direct measurement of pump output. The aim of this study was to test the hypothesis that quantitative contrast echocardiography can be used to measure VAD output. METHODS: Contrast-enhanced Doppler velocity-time integral (VTI) was measured in the VAD inlet and outlet cannulae. Doppler flow (Doppler Q=Doppler VTIxcannula area) was compared with measured flow (Q). A total of 130 flow measurements were made (at 6400 and 12,000 rpm). RESULTS: Doppler Q in the outflow and inflow cannulae showed an excellent correlation with measured Q (outlet Doppler Q=1.0052 xQ+0.048, R2=0.9865; inlet Doppler Q=1.5043 xQ+0.003, R2=0.9904), but inlet Doppler Q was 50% higher. Correcting for the flow profile of the conical inlet tube yielded excellent correlation (inlet Doppler Q=1.0029 xQ+0.002, R2=0.9904). CONCLUSION: Noninvasive Doppler flow techniques can be used to accurately measure VAD flow, but the flow profile in the cannula needs to be taken into account. |
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Authors:
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Karl Q Schwarz; Sachin S Parikh; Xucai Chen; David J Farrar; Sherry Steinmetz; Sridevi Ramamurthi; William Hallinan; H Todd Massey; Leway Chen |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of the American Society of Echocardiography : official publication of the American Society of Echocardiography Volume: 23 ISSN: 1097-6795 ISO Abbreviation: J Am Soc Echocardiogr Publication Date: 2010 Mar |
Date Detail:
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Created Date: 2010-03-08 Completed Date: 2010-06-09 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8801388 Medline TA: J Am Soc Echocardiogr Country: United States |
Other Details:
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Languages: eng Pagination: 324-9 Citation Subset: IM |
Copyright Information:
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Copyright (c) 2010 American Society of Echocardiography. Published by Mosby, Inc. All rights reserved. |
Affiliation:
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University of Rochester Medical Center, Rochester, New York 14642, USA. karl_schwarz@urmc.rochester.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Blood Flow Velocity Computer Simulation Contrast Media* Coronary Circulation / physiology* Feasibility Studies Heart Ventricles / ultrasonography* Heart-Assist Devices* Humans Models, Cardiovascular* Rheology / methods* Ventricular Function, Left / physiology* Ventricular Premature Complexes |
| Chemical | |
Reg. No./Substance:
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0/Contrast Media |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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