| Mr flow measurement in the internal mammary artery-to-coronary artery bypass graft: comparison with graft stenosis at radiographic angiography. | |
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MedLine Citation:
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PMID: 11477249 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: To evaluate the sensitivity and specificity of breath-hold magnetic resonance (MR) flow measurement for detection of significant stenosis in internal mammary artery bypass grafts. MATERIALS AND METHODS: Twenty-six consecutive patients who had undergone coronary artery bypass surgery were examined. Breath-hold velocity-encoded cine MR images were obtained at the midpoint of the internal mammary artery between its origin from the subclavian artery and the distal anastomosis to the left anterior descending artery. RESULTS: MR images were obtained successfully in 24 patients. At conventional angiography, no significant stenosis was observed in 17 patients (group A), and significant stenosis (diameter > 70%) was observed in seven patients (group B). The mean diastolic-to-systolic peak velocity ratio in group B (0.61 +/- 0.44 [SD]) was significantly lower than that in group A (1.88 +/- 0.96; P <.01). Evaluation of graft stenosis with the diastolic-to-systolic peak velocity ratio revealed a sensitivity of 86% and a specificity of 88%. The mean blood flow rate at baseline in group B (16.9 mL/min +/- 5.5) was significantly lower than that in group A (79.8 mL/min +/- 38.2; P <.01). The sensitivity and specificity of MR blood flow measurement in predicting significant stenosis were 86% and 94%, respectively. The mean pharmacologic flow reserve ratios were 2.00 +/- 1.43 in group A and 1.39 +/- 1.46 in group B (P >.05). CONCLUSION: Fast MR blood flow measurement at baseline is highly useful for predicting significant stenosis in internal mammary arterial grafts. |
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Authors:
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N Ishida; H Sakuma; B P Cruz; T Shimono; T Tokui; I Yada; K Takeda; C B Higgins |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: Radiology Volume: 220 ISSN: 0033-8419 ISO Abbreviation: Radiology Publication Date: 2001 Aug |
Date Detail:
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Created Date: 2001-07-30 Completed Date: 2001-08-09 Revised Date: 2007-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0401260 Medline TA: Radiology Country: United States |
Other Details:
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Languages: eng Pagination: 441-7 Citation Subset: AIM; IM |
Affiliation:
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Department of Radiology, Mie University School of Medicine, 2-174 Edobashi, Tsu, Mie 514-8507, Japan. nanaka@clin.medic.mie-u.ac.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Aged Aged, 80 and over Angiography* Coronary Artery Bypass* Coronary Vessels / pathology* Dipyridamole / diagnostic use Female Graft Occlusion, Vascular / diagnosis* Hemodynamics Humans Magnetic Resonance Angiography* Male Mammary Arteries / pathology* Middle Aged Postoperative Complications Sensitivity and Specificity Vasodilator Agents / diagnostic use |
| Chemical | |
Reg. No./Substance:
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0/Vasodilator Agents; 58-32-2/Dipyridamole |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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