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Published online before print July 23, 2004, 10.1148/radiol.2323030289
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(Radiology 2004;232:915-920.)
© RSNA, 2004

Technical Developments

Blood Flow in Coronary Artery Bypass Vein Grafts: Volume versus Velocity at Cardiovascular MR Imaging1

Liesbeth P. Salm, MD, Susan E. Langerak, MD, PhD, Hubert W. Vliegen, MD, PhD, J. Wouter Jukema, MD, PhD, Jeroen J. Bax, MD, PhD, Aeilko H. Zwinderman, PhD, Ernst E. van der Wall, MD, PhD, Albert de Roos, MD, PhD and Hildo J. Lamb, PhD

1 From the Departments of Cardiology (L.P.S., S.E.L., H.W.V., J.W.J., J.J.B., E.E.v.d.W.) and Radiology (L.P.S., A.d.R., H.J.L.), Leiden University Medical Center, Albinusdreef 2, 2333 ZA, Leiden, the Netherlands; the Interuniversity Cardiology Institute of the Netherlands, Utrecht (L.P.S., J.W.J., E.E.v.d.W.); and Department of Medical Statistics, Academic Medical Center, Amsterdam, the Netherlands (A.H.Z.). Received February 21, 2003; revision requested May 14; final revision received December 5; accepted January 21, 2004. J.W.J. supported by the Netherlands Heart Foundation (grant 2001D032). Address correspondence to L.P.S. (e-mail: l.p.salm@lumc.nl).

Forty-nine patients with previous bypass surgery underwent coronary angiography and cardiovascular magnetic resonance (MR) imaging of single-vein bypass grafts. Volume flow and velocity analyses were performed and compared on MR velocity maps. Bland-Altman analysis showed close agreement between the two types of analysis. Comparison of areas under the receiver operating characteristic curve revealed no significant differences between the analyses for detection of stenoses of 70% or greater. Diagnostic accuracy for volume flow and velocity parameters was 92% and 93%, respectively. Velocity analysis appears to be the preferred method, because it is less time-consuming and has a similar diagnostic accuracy to volume flow analysis.

© RSNA, 2004

Index terms: Coronary angiography, 54.1244 • Coronary vessels, bypass graft, 54.4551 • Coronary vessels, flow dynamics, 54.121412, 54.12144 • Coronary vessels, MR, 54.12144 • Coronary vessels, stenosis or obstruction, 54.76






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