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[Noninvasive assessment of aortocoronary bypass using magnetic resonance tomography]
P Theissen1, U Sechtem, S Langkamp
1Institut für klinische und experimentelle Nuklearmedizin, Universität zu Köln, Bundesrepublik Deutschland.
Insights
Magnetic resonance imaging shows good specificity for detecting patent coronary artery bypass grafts but has low sensitivity for identifying occluded grafts, limiting its clinical use.
Area of Science:
- Cardiovascular imaging
- Medical diagnostics
Context:
- Recurrent chest pain after coronary artery bypass surgery necessitates graft patency evaluation.
- Non-invasive imaging methods are sought to assess coronary artery bypass graft status.
Purpose:
- To evaluate the efficacy of magnetic resonance imaging (MRI) for assessing coronary artery bypass graft patency.
Summary:
- MRI using spin-echo technique evaluated 92 grafts in 44 patients.
- MRI demonstrated 83% specificity for patent grafts but only 56% sensitivity for occluded grafts.
Impact:
- The high specificity of MRI is promising, but its low sensitivity for occluded grafts restricts its clinical application in evaluating coronary artery bypass graft patency.
Abstract:
Forty-four patients with recent cardiac catheterization because of recurrent chest pain after coronary artery bypass surgery were studied by magnetic resonance imaging to evaluate graft patency. To assess the efficacy of this non-invasive method 92 coronary artery bypass grafts were examined by the spin-echo technique. ECG-gated transversal sections were acquired between the diaphragm and the aortic arch. The specificity of magnetic resonance imaging was 83% (48/58) for patent grafts. However, the sensitivity in the detection of occluded bypasses was only 56% (19/34). Despite the good specificity, clinical applications of this method are limited because of its low sensitivity.