title: MR angiography and flow quantification of the internal mammary artery graft after minimally invasive direct coronary artery bypass.
abstract: OBJECTIVE
  Six patients who had undergone minimally invasive direct coronary artery bypass surgery were examined to evaluate an MR imaging protocol that provided information about cardiac function, bypass graft patency, and flow characteristics with a single examination.
  
  
  CONCLUSIONS
  Preliminary results suggest that our imaging protocol allows accurate follow-up of patients after minimally invasive direct coronary artery bypass surgery. Bypass graft patency was correctly determined in all patients. In four patients, anastomoses were visualized by MR angiography, and flow measurements revealed a volume range of 28-84 ml/min (native and grafted internal mammary arteries) and a trend for the flow values of bypass grafts to be lower than those of native vessels. Interobserver reproducibility was good (r = .99; slope, .98).
authors.affiliation: Department of Diagnostic Radiology, Eberhard-Karls-University, Tuebingen, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Miller
authors.forename: A M
authors.initials: AM
authors.lastname: Scheule
authors.forename: U
authors.initials: U
authors.lastname: Hahn
authors.forename: M
authors.initials: M
authors.lastname: Jurmann
authors.forename: U
authors.initials: U
authors.lastname: Helber
authors.forename: S H
authors.initials: SH
authors.lastname: Duda
authors.forename: N I
authors.initials: NI
authors.lastname: Stauder
authors.forename: C D
authors.initials: CD
authors.lastname: Claussen
mesh_terms: D003287:Contrast Media; D003326:Coronary Circulation; D019786:Gadolinium DTPA; D006083:Graft Occlusion, Vascular / Q000175:diagnosis; D006801:Humans; D007387:Internal Mammary-Coronary Artery Anastomosis / Q000379:methods; D018810:Magnetic Resonance Angiography; D008297:Male; D008875:Middle Aged; D019060:Minimally Invasive Surgical Procedures; D014654:Vascular Patency
chemical_list: D003287:Contrast Media; D019786:Gadolinium DTPA