Blood flow in coronary artery bypass vein grafts: volume versus velocity at cardiovascular MR imaging.
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.
Department of Cardiology, Leiden University Medical Center, Albinusdreef 2, 2333 ZA, Leiden, The Netherlands. l.p.salm@lumc.nl
Liesbeth P
LP
Salm
Susan E
SE
Langerak
Hubert W
HW
Vliegen
J Wouter
JW
Jukema
Jeroen J
JJ
Bax
Aeilko H
AH
Zwinderman
Ernst E
EE
van der Wall
Albert
A
de Roos
Hildo J
HJ
Lamb
D000328:Adult; D000368:Aged; D001026:Coronary Artery Bypass; D003326:Coronary Circulation; D023903:Coronary Restenosis / Q000175:diagnosis; D005260:Female; D006439:Hemodynamics; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D012039:Regional Blood Flow; D015203:Reproducibility of Results; D014680:Veins / Q000503:physiopathology / Q000601:surgery