HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Full Text (PDF) Submit a response Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Ishida, N. Articles by Higgins, C. B. Search for Related Content PubMed PubMed Citation Articles by Ishida, N. Articles by Higgins, C. B.

MR Flow Measurement in the Internal Mammary Artery–to–Coronary Artery Bypass Graft: Comparison with Graft Stenosis at Radiographic Angiography¹

¹ From the Departments of Radiology (N.I., H.S., K.T.) and Thoracic Surgery (B.P.C., T.S., T.T., I.Y.), Mie University School of Medicine, 2-174 Edobashi, Tsu, Mie 514-8507, Japan; and the Department of Radiology, University of California Medical Center, San Francisco (C.B.H.). Received July 20, 2000; revision requested September 7; final revision received February 15, 2001; accepted February 26. Address correspondence to N.I. (e-mail: nanaka@clin.medic.mie-u.ac.jp).

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.

Index terms: Arteries, MR, 54.121416, 54.12144, 949.129416, 949.12944 • Arteries, stenosis or obstruction, 949.721 • Coronary vessels, flow dynamics, 54.91, 949.91 • Coronary vessels, MR, 54.121416, 949.129416 • Magnetic resonance (MR), flow studies, 54.121416, 54.12144, 949.129416, 949.12944 • Stents and prostheses, 949.1268

This article has been cited by other articles:

				N I Stauder, B Klumpp, H Stauder, G Blumenstock, M Fenchel, A Kuttner, C D Claussen, and S Miller Assessment of coronary artery bypass grafts by magnetic resonance imaging Br. J. Radiol., December 1, 2007; 80(960): 975 - 983. [Abstract] [Full Text] [PDF]

				N I Stauder, A M Scheule, U Hahn, M Fenchel, F S Eckstein, U Kramer, C D Claussen, and S Miller Perioperative monitoring of flow and patency in native and grafted internal mammary arteries using a combined MR protocol Br. J. Radiol., April 1, 2005; 78(928): 292 - 298. [Abstract] [Full Text] [PDF]

				N. I. Stauder, M. Fenchel, H. Stauder, A. Kuttner, A. M. Scheule, U. Kramer, C. D. Claussen, and S. Miller Assessment of minimally invasive direct coronary artery bypass grafting of the left internal thoracic artery by means of magnetic resonance imaging J. Thorac. Cardiovasc. Surg., March 1, 2005; 129(3): 607 - 614. [Abstract] [Full Text] [PDF]

				L. P. Salm, S. E. Langerak, H. W. Vliegen, J. W. Jukema, J. J. Bax, A. H. Zwinderman, E. E. van der Wall, A. de Roos, and H. J. Lamb Blood Flow in Coronary Artery Bypass Vein Grafts: Volume versus Velocity at Cardiovascular MR Imaging Radiology, September 1, 2004; 232(3): 915 - 920. [Abstract] [Full Text] [PDF]

				S. E. Langerak, H. W. Vliegen, J. W. Jukema, A. H. Zwinderman, H. J. Lamb, A. de Roos, and E. E. van der Wall Vein Graft Function Improvement after Percutaneous Intervention: Evaluation with MR Flow Mapping Radiology, September 1, 2003; 228(3): 834 - 841. [Abstract] [Full Text] [PDF]

				S. E. Langerak, H. W. Vliegen, J. W. Jukema, P. Kunz, A. H. Zwinderman, H. J. Lamb, E. E. van der Wall, and A. de Roos Value of Magnetic Resonance Imaging for the Noninvasive Detection of Stenosis in Coronary Artery Bypass Grafts and Recipient Coronary Arteries Circulation, March 25, 2003; 107(11): 1502 - 1508. [Abstract] [Full Text] [PDF]

				W. L. F. Bedaux, M. B. M. Hofman, S. L. A. Vyt, J. G. F. Bronzwaer, C. A. Visser, and A. C. van Rossum Assessment of coronary artery bypass graft disease using cardiovascular magnetic resonance determination of flow reserve J. Am. Coll. Cardiol., November 20, 2002; 40(10): 1848 - 1855. [Abstract] [Full Text] [PDF]