Coronary Artery Bypass Graft - Case Study

Courtesy of Dr. W. Dennis Foley
Froedtert Memorial Lutheran Hospital, Medical College of Wisconsin, Milwaukee, WI USA

Coronary Artery Bypass Graft

Volume rendering demonstrating CABGs. LIMA Y-bypass graft.
Volume rendering demonstrating CABGs.
 LIMA Y-bypass graft.

Clinical Background

  • 56-year-old male patient with coronary artery disease.
  • LIMA bypass graft to mid and distal LAD, a free RIMA graft from LIMA to obtuse marginal branch of the circumflex and a stent placed in distal dominant left circumflex coronary artery.
  • Bypass evaluation for graft patency.

Curved reformat
MIP reformat of the LIMA graft to the LAD
MIP reformat demonstrating LIMA to LAD and Y-bypass
Curved reformat demonstrating dominate left circumflex filling the PDA.
 MIP reformat of the LIMA graft to the LAD. MIP reformat demonstrating LIMA to LAD and Y-bypass to obtuse marginal branch of the LCX.

Diagnosis

  • Normal patency of arterial bypass grafts and stent.
  • LightSpeed VCT provided a rapid coverage from left subclavian artery to the cardiac apex without compromising the spatial resolution and thus enabled cardiac gated thoracic CT for CABG surveillance.

Scan Technique

  • Detector Configuration: 64 x 0.625 mm at 40 mm coverage per rotation
  • Gantry Speed: 0.5 sec
  • Scan Time: 11.8 sec
  • Pitch: 0.25
  • Scan Coverage: 236 mm
  • Contrast: 80 cc @ 5 cc/sec with 25 cc saline push

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