title: [Possibilities and prospects of noninvasive bypass diagnosis. Comparison of different nuclear magnetic resonance tomography methods with conventional coronary angiography].
abstract: OBJECTIVE
  The aim of the study was to evaluate the patency of coronary artery bypass grafts (CABGs) with different MR imaging techniques.
  
  
  METHODS
  25 patients with 63 bypass grafts and a total of 78 distal anastomoses were studied at a 1.5-Tesla scanner. A 2-D T2-weighted breath-hold turbo spin echo sequence (Haste), a 3-D breath-hold contrast-enhanced MR angiography sequence (Fisp-3-D), and 3-D angiography sequence in navigator techniques were used.
  
  
  RESULTS
  With the Haste and Fisp-3-D sequences, 44 of the 47 patent and 14 of the 16 occluded grafts were recognized, the sensitivity and specificity were 94% and 88%, respectively. With the Haste sequence, 80% (43/54) of the distal anastomoses were seen in good image quality, and with the Fish-3-D sequence 70% (38/54). The navigator sequence showed less sensitivity and specificity (74% and 63%, respectively).
  
  
  CONCLUSIONS
  The patency of CABGs can be evaluated noninvasively with the Haste and the Fisp-3-D angiography sequences. Better results can be expected with the development of a blood-pool contrast medium and an improvement of the spatial resolution.
authors.affiliation: Medizinische Klinik und Poliklinik, Klinikum der Johannes Gutenberg-Universität Mainz. wittlinger@2-med.klinik.uni-mainz.de
authors.forename: Thomas
authors.initials: T
authors.lastname: Wittlinger
authors.forename: Thomas
authors.initials: T
authors.lastname: Voigtländer
authors.forename: Jürgen
authors.initials: J
authors.lastname: Meyer
authors.forename: Karl-Friedrich
authors.initials: KF
authors.lastname: Kreitner
authors.forename: Peter
authors.initials: P
authors.lastname: Kalden
authors.forename: Manfred
authors.initials: M
authors.lastname: Thelen
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D017023:Coronary Angiography; D001026:Coronary Artery Bypass; D003327:Coronary Disease / Q000175:diagnosis / Q000601:surgery*; D005260:Female; D006083:Graft Occlusion, Vascular / Q000175:diagnosis*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional; D018810:Magnetic Resonance Angiography; D008297:Male; D008875:Middle Aged; D012680:Sensitivity and Specificity