| A simplified continuity equation approach to the quantification of stenotic bicuspid aortic valves using velocity-encoded cardiovascular magnetic resonance. | |
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MedLine Citation:
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PMID: 18066750 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: We aimed to compare velocity-encoded cine cardiac magnetic resonance (CMR) with an established echocardiographic method for noninvasive measurement of aortic valve area (AVA) using the continuity equation. METHODS AND RESULTS: Twenty consecutive young adults with stenotic bicuspid aortic valves were examined with CMR and transthoracic echocardiography (TTE). CMR AVA was calculated by the continuity equation, dividing stroke volume by the aortic velocity-time integral (VTIAorta), the stroke volume measured both by ventricular volume analysis and by phase contrast velocity mapping at 4 levels (1 subvalvar and 3 supravalvar). Stroke volumes measured at all levels correlated well with those from volumetric analysis. The CMR AVAs calculated using volumetric analysis and VTIAorta from jet velocity mapping correlated and agreed well with TTE AVA measurements (R2 = 0.83). When CMR AVA was calculated more rapidly using volume flow and VTIAorta both measured from the same trans-jet velocity acquisition, R2 was 0.74, with a bias and limits of agreement of 0.02 (-0.44, 0.47) cm2. CONCLUSIONS: Continuity equation calculation of the AVA using CMR velocity mapping, with or without ventricular volumetric measurement, correlated and agreed well with the comparable and widely accepted TTE approach. |
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Authors:
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Sing-Chien Yap; Robert-Jan van Geuns; Folkert J Meijboom; Sharon W Kirschbaum; Jackie S McGhie; Maarten L Simoons; Philip J Kilner; Jolien W Roos-Hesselink |
Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of cardiovascular magnetic resonance : official journal of the Society for Cardiovascular Magnetic Resonance Volume: 9 ISSN: 1097-6647 ISO Abbreviation: J Cardiovasc Magn Reson Publication Date: 2007 |
Date Detail:
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Created Date: 2007-12-10 Completed Date: 2008-02-25 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9815616 Medline TA: J Cardiovasc Magn Reson Country: United States |
Other Details:
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Languages: eng Pagination: 899-906 Citation Subset: IM |
Affiliation:
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Department of Cardiology, Thoraxcenter, Rotterdam, The Netherlands. s.c.yap@erasmusmc.nl |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aortic Valve / pathology*, ultrasonography Aortic Valve Stenosis / pathology*, ultrasonography Blood Flow Velocity Echocardiography Female Humans Image Interpretation, Computer-Assisted Linear Models Magnetic Resonance Imaging, Cine* Male Prospective Studies Stroke Volume |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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