| Myocardial perfusion imaging after coronary artery bypass surgery using cardiovascular magnetic resonance: a validation study. | |
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MedLine Citation:
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PMID: 21343329 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND: Absolute quantification of perfusion with cardiovascular magnetic resonance has not previously been applied in patients with coronary artery bypass grafting (CABG). Owing to increased contrast bolus dispersion due to the greater distance of travel through a bypass graft, this approach may result in systematic underestimation of myocardial blood flow (MBF). As resting MBF remains normal in segments supplied by noncritical coronary stenosis (<85%), measurement of perfusion in such territories may be utilized to reveal systematic error in the quantification of MBF. The objective of this study was to test whether absolute quantification of perfusion with cardiovascular magnetic resonance systematically underestimates MBF in segments subtended by bypass grafts. METHODS AND RESULTS: The study population comprised 28 patients undergoing elective CABG for treatment of multivessel coronary artery disease. Eligible patients had angiographic evidence of at least 1 myocardial segment subtended by a noncritically stenosed coronary artery (<85%). Subjects were studied at 1.5 T, with evaluation of resting MBF using model-independent deconvolution. Analyses were confined to myocardial segments subtended by native coronary arteries with <85% stenosis at baseline, and MBF was compared in grafted and ungrafted segments before and after revascularization. A total of 249 segments were subtended by coronary arteries with <85% stenosis at baseline. After revascularization, there was no significant difference in MBF in ungrafted (0.82±0.19 mL/min/g) versus grafted segments (0.82±0.15 mL/min/g, P=0.57). In the latter, MBF after revascularization did not change significantly from baseline (0.86±0.20 mL/min/g, P=0.82). CONCLUSIONS: Model-independent deconvolution analysis does not systematically underestimate blood flow in graft-subtended territories, justifying the use of this methodology to evaluate myocardial perfusion in patients with CABG. |
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Authors:
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J Ranjit Arnold; Jane M Francis; Theodoros D Karamitsos; Chris C Lim; William J van Gaal; Luca Testa; Paul Bhamra-Ariza; Joseph B Selvanayagam; Rana Sayeed; Stephen Westaby; Adrian P Banning; Stefan Neubauer; Michael Jerosch-Herold |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Validation Studies Date: 2011-02-22 |
Journal Detail:
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Title: Circulation. Cardiovascular imaging Volume: 4 ISSN: 1942-0080 ISO Abbreviation: Circ Cardiovasc Imaging Publication Date: 2011 May |
Date Detail:
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Created Date: 2011-05-18 Completed Date: 2011-08-17 Revised Date: 2011-09-06 |
Medline Journal Info:
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Nlm Unique ID: 101479935 Medline TA: Circ Cardiovasc Imaging Country: United States |
Other Details:
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Languages: eng Pagination: 312-8 Citation Subset: IM |
Affiliation:
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University of Oxford Centre for Clinical Magnetic Resonance Research, John Radcliffe Hospital, Oxford, United Kingdom. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Contrast Media Coronary Angiography Coronary Artery Bypass* Coronary Artery Disease / physiopathology, surgery* Coronary Circulation* Coronary Stenosis / diagnosis Gadolinium DTPA / diagnostic use* Humans Magnetic Resonance Imaging* Myocardial Perfusion Imaging* |
| Grant Support | |
ID/Acronym/Agency:
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//British Heart Foundation; //Medical Research Council |
| Chemical | |
Reg. No./Substance:
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0/Contrast Media; 122795-43-1/gadodiamide; 80529-93-7/Gadolinium DTPA |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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