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1
Department of Radiology, Johannes Gutenberg-University Mainz, Langenbeckstr.
1, D-55131 Mainz, Germany.
2
Department of Cardiothoracic and Vascular Surgery, Johannes
Gutenberg-University Mainz, D-55131 Mainz, Germany.
3
Department of Medical Statistics and Documentation, Johannes
Gutenberg-University Mainz, Obere Zahlbacher Str. 69, D-55131 Mainz,
Germany.
4
Department of Endocrinology, III. Medical Clinic, Johannes
Gutenberg-University Mainz, D-55131 Mainz, Germany.
5
Siemens Medical Engineering, Henkestr. 127, D-91318 Erlangen, Germany.
OBJECTIVE. The purpose of this study was to compare contrast-enhanced three-dimensional MR angiography with conventional digital subtraction angiography (DSA) for identifying and evaluating arteries of the distal calf and foot in diabetic patients with severe arterial occlusive disease who will undergo distal bypass surgery.
SUBJECTS AND METHODS. Twenty-four feet of 24 consecutive patients with diabetes and limb-threatening lower extremity ischemia were prospectively imaged using an ultrafast three-dimensional fast low-angle shot sequence on a 1.5-T MR scanner. All patients also underwent DSA of the diseased extremity within 5 days. Images were interpreted in a randomized manner by two observers in conference. Each lower extremity was divided into seven potential arterial segments. Image analysis included the detection of patent, stenosed, or occluded vessel segments. A vascular surgeon formulated treatment plans on the basis of findings from DSA and then formulated treatment plans on the basis of findings from both DSA and MR angiography.
RESULTS. MR angiography was significantly better than DSA in revealing peripheral runoff vessels (p < 0.001). In nine (38%) of the 24 patients, MR angiography showed patent pedal vessels suitable for distal bypass grafting that were not revealed by DSA. Because of the results of MR angiography, treatment plans changed in seven of the nine patients in whom patent vessels were subsequently used as target vessels for distal pedal bypass grafts.
CONCLUSION. Contrast-enhanced three-dimensional MR angiography is superior to DSA in revealing patent vessel segments of the foot in diabetic patients with severe arterial occlusive disease. Contrast-enhanced three-dimensional MR angiography should be part of the diagnostic algorithm for patients in whom pedal bypass grafting is a therapeutic option.
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