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Continuing Education |
1 Departments of Imaging and Medicine, Cedars-Sinai Medical Center, Burns and Allen Research Institute, Los Angeles, California; 2 Departments of Medicine and Radiological Sciences, David Geffen School of Medicine at UCLA, Los Angeles, California; 3 University of Southern California, School of Medicine, Los Angeles, California; 4 Heart Disease Prevention Program, Department of Medicine, University of California, Irvine, California; and 5 Department of Cardiology, St. Luke's Roosevelt Hospital Center, New York, New York
Correspondence: For correspondence or reprints contact: Daniel S. Berman, MD, Cardiac Imaging, Cedars-Sinai Medical Center, 8700 Beverly Blvd., Room 1258, Los Angeles, CA 90048. E-mail: bermand{at}cshs.org
This review deals with noninvasive imaging for risk stratification and with a conceptual approach to the selection of noninvasive tests in patients with suspected or known chronic coronary artery disease (CAD). Already widely acknowledged with SPECT, there is an increasing body of literature data demonstrating that CT coronary calcium assessment is also of prognostic value. The amount of coronary atherosclerosis, as can be extrapolated from CT coronary calcium score, has been shown to be highly predictive of cardiac events. The principal difference between myocardial perfusion SPECT (MPS) and CT coronary calcium for prognostic application appears to be that the former is an excellent tool for assessing short-term risk, thus effectively guiding decisions regarding revascularization. In contrast, the atherosclerosis imaging methods are likely to provide greater long-term risk assessment and, thus, are more useful in determination of the need for aggressive medical prevention measures. Although the more recent development of CT coronary angiography is promising for diagnosis, there has been no information to date regarding the prognostic value of the CT angiographic data. Similarly, cardiac MRI has not yet been adequately studied for its prognostic content. The selection of the most appropriate test for a given patient depends on the specific question being asked. In patients with a very low likelihood of CAD, no imaging test may be required. In screening the remaining asymptomatic patients, atherosclerosis imaging may be beneficial. In symptomatic patients, MPS, CT coronary angiography, and cardiac MRI play important roles. We consider it likely that, with an increased emphasis on prevention and a concomitant aging of the population, many forms of noninvasive cardiac imaging will continue to grow, with nuclear cardiology continuing to grow.
Key Words: cardiac computed tomography cardiac magnetic resonance myocardial perfusion SPECT coronary artery disease
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