| Quantification of coronary artery bypass graft flow by magnetic resonance phase velocity mapping. | |
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MedLine Citation:
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PMID: 8843361 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVES: Determination of the true coronary artery bypass graft function requires quantification of the flow rate within the graft. The purpose of the present study was to assess the feasibility of characterizing and quantifying graft flow by magnetic resonance phase velocity mapping. MATERIALS AND METHODS: Twenty-seven patients with 41 angiographically patent coronary artery bypass grafts underwent electrocardiographically gated magnetic resonance phase velocity mapping. Imaging was performed at 0.6 Tesla using a surface coil. Velocity maps of the bypass grafts were obtained throughout the cardiac cycle with a temporal resolution of 50 ms and a spatial resolution of 1.9 x 1.2 x 5 mm3, allowing calculation of phasic and mean graft flow. RESULTS: Adequate flow measurements were obtained in 84% (41 out of 49) of the grafts. Coronary artery bypass graft flow was characterized by a biphasic pattern with a first peak during systole and a second peak during diastole. Average maximum systolic and diastolic velocities over the cross-section of the grafts were 14 +/- 8 cm/s and 15 +/- 9 cm/s, respectively. Mean coronary artery bypass graft cross-sectional area was 0.28 +/- 0.13 cm2. Mean volume flow was 87 +/- 59 ml/min. CONCLUSION: Flow in coronary artery bypass grafts can be characterized and measured noninvasively by magnetic resonance phase velocity mapping. |
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Authors:
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M A Galjee; A C van Rossum; T Doesburg; M B Hofman; T H Falke; C A Visser |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Magnetic resonance imaging Volume: 14 ISSN: 0730-725X ISO Abbreviation: Magn Reson Imaging Publication Date: 1996 |
Date Detail:
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Created Date: 1996-12-10 Completed Date: 1996-12-10 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 8214883 Medline TA: Magn Reson Imaging Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 485-93 Citation Subset: IM |
Affiliation:
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Department of Cardiology, Free University Hospital Amsterdam, The Netherlands. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Blood Flow Velocity* Coronary Angiography Coronary Artery Bypass* Coronary Vessels / physiology* Feasibility Studies Graft Occlusion, Vascular Humans Magnetic Resonance Imaging* Vascular Patency |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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