title: Contrast-enhanced breath-hold MR angiography for evaluating patency of coronary artery bypass grafts.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the ability of contrast-enhanced breath-hold MR angiography to reveal patency of coronary artery bypass grafts (CABGs).
  
  
  METHODS
  We evaluated 45 grafts (29 saphenous vein bypass grafts, 12 left internal mammary artery grafts, and four right internal mammary artery grafts) for occlusion or patency. Fifteen patients who had undergone CABG surgery underwent three-dimensional breath-hold ECG-triggered contrast-enhanced MR angiography at 1.5-T and conventional coronary angiography imaging within 24 hr of each other. MR angiograms were evaluated independently by two radiologists. Agreement between MR angiography and coronary angiography (the reference standard) was measured using Cohen's kappa statistic.
  
  
  RESULTS
  One saphenous vein bypass graft was revealed as occluded by coronary angiography but was shown as patent by MR angiography and was excluded from statistical analysis. MR angiography was in agreement with coronary angiography in 42 of 44 grafts (kappa = 90: p < .001; sensitivity, 93%; specificity, 97%).
  
  
  CONCLUSIONS
  Contrast-enhanced breath-hold MR angiography is a promising, rapid, and useful diagnostic technique for detecting graft patency in patients who have undergone CABG surgery.
authors.affiliation: Department of Diagnostic Radiology, William Beaumont Hospital, Royal Oak, MI 48073, USA.
authors.forename: T G
authors.initials: TG
authors.lastname: Vrachliotis
authors.forename: K G
authors.initials: KG
authors.lastname: Bis
authors.forename: D
authors.initials: D
authors.lastname: Aliabadi
authors.forename: A N
authors.initials: AN
authors.lastname: Shetty
authors.forename: R
authors.initials: R
authors.lastname: Safian
authors.forename: O
authors.initials: O
authors.lastname: Simonetti
mesh_terms: D000328:Adult; D000368:Aged; D017023:Coronary Angiography; D001026:Coronary Artery Bypass; D005260:Female; D006083:Graft Occlusion, Vascular / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006801:Humans; D018810:Magnetic Resonance Angiography; D008297:Male; D008323:Mammary Arteries / Q000473:pathology; D008875:Middle Aged; D011237:Predictive Value of Tests; D012501:Saphenous Vein / Q000473:pathology / Q000637:transplantation; D012680:Sensitivity and Specificity; D014654:Vascular Patency