title: Evaluation of coronary artery bypass graft patency using three-dimensional reconstruction and flow study of electron beam tomography.
abstract: OBJECTIVE
  To establish and evaluate two protocols for the noninvasive visualization and assessment of coronary artery bypass graft (CABG) patency on electron beam tomography (EBT).
  
  
  METHODS
  Two hundred and fourteen consecutive patients who underwent coronary artery bypass graft surgery were scanned using both EBT angiography with 3-dimensional reconstruction and EBT flow study with time-density-curve analysis.
  
  
  RESULTS
  There were 589 CABGs evaluated in this study (10 grafts were excluded because of artifacts). Among them, 133 (98.5%) of 135 arterial grafts were patent, and 345 (77.7%) of 444 saphenous-vein grafts were patent. Within 5 years or between 5 and 10 years after operation, arterial graft patency exceeded venous graft patency (P < 0.001). Three-dimensional EBT angiography achieved higher sensitivity, specificity and accuracy (97.7%, 94.1% and 96.7%, respectively) than did EBT flow study (88.4%, 82.4% and 85.2%, respectively) for evaluating occlusion or patency of CABG. The intra-graft flow of patent arterial and venous grafts were 4.9 +/- 2.2 ml.min-1.g-1 and 6.9 +/- 2.8 ml.min-1.g-1, respectively (P < 0.001).
  
  
  CONCLUSIONS
  The combination of EBT three-dimensional reconstruction and flow study can be more effective in the assessment of CABG anatomy and quantification of patent CABG blood flow.
authors.affiliation: Department of Radiology, Cardiovascular Institute, Fuwai Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100037, China. lubin99@aol.com
authors.forename: B
authors.initials: B
authors.lastname: Lu
authors.forename: R
authors.initials: R
authors.lastname: Dai
authors.forename: B
authors.initials: B
authors.lastname: Jing
authors.forename: H
authors.initials: H
authors.lastname: Bai
authors.forename: S
authors.initials: S
authors.lastname: He
authors.forename: N
authors.initials: N
authors.lastname: Zhuang
authors.forename: Q
authors.initials: Q
authors.lastname: Wu
authors.forename: X
authors.initials: X
authors.lastname: Zhu
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D017023:Coronary Angiography; D001026:Coronary Artery Bypass; D003326:Coronary Circulation; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional; D008297:Male; D008875:Middle Aged; D014057:Tomography, X-Ray Computed