Prognostic value of stress-gated 99m-technetium SPECT myocardial perfusion imaging: Risk stratification of patients with multivessel coronary artery disease and prior coronary revascularization
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This study assessed the prognostic value of stress-gated 99mTc-sestamibi myocardial perfusion SPECT (MPS) in patients with multivessel coronary artery disease (CAD) and prior revascularization according to the presence and severity of ischemia.
Methods and Results
We studied the outcome of 472 patients with multivessel CAD and prior revascularization (coronary angioplasty, 290 patients; bypass surgery, 182 patients), who underwent exercise or dipyridamole 99mTc-sestamibi MPS for evaluation of ischemia. Visual scoring of perfusion images used 20 segments and a 5-point scale. Gated post-stress EF was automatically calculated. Endpoints included hard events: cardiac death (CD) and nonfatal myocardial infarction (MI). During a mean follow-up of 3.0 ± 1.0 years, 37 hard events occurred, including CD in 15 (3%) and MI in 22 (5%) patients. In a risk-adjusted multivariable Cox model, a history of prior MI, diabetes, abnormal MPS, moderate-to-severe ischemia, and post-stress EF <35% were important predictors of cardiac events. Four-year risk-adjusted survival was 97.9% for normal MPS, 87.3% for abnormal MPS with ischemia, and 82.1% for moderate-to-severe ischemia.
Among patients with previous coronary revascularization, stress-gated 99mTc-sestamibi MPS provides prognostic information for the prediction of cardiac events. A normal perfusion scan confers an excellent prognosis and an exceedingly low hard event rate (<1%/year). The presence of moderate-to-severe ischemia or a post-stress EF <35% identifies patients at highest risk of subsequent cardiac events.
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- Prognostic value of stress-gated 99m-technetium SPECT myocardial perfusion imaging: Risk stratification of patients with multivessel coronary artery disease and prior coronary revascularization
Journal of Nuclear Cardiology
Volume 20, Issue 5 , pp 755-762
- Cover Date
- Print ISSN
- Online ISSN
- Springer US
- Additional Links
- Myocardial perfusion imaging
- gated SPECT
- coronary artery disease
- prior coronary revascularization
- left ventricular function
- Industry Sectors
- Author Affiliations
- 1. Clinic of Cardiology, Department of Internal Medicine, City Hospital Triemli, Zurich, Switzerland
- 2. Clinic of Nuclear Medicine, City Hospital Triemli, Zurich, Switzerland
- 3. Cardiovascular Center, University Hospital Zurich, Zurich, Switzerland
- 4. La Volta Statistics, Zurich, Switzerland
- 5. Division of Cardiology, Department of Internal Medicine, Cantonal Hospital Winterthur, Brauerstr. 15, 8400, Winterthur, Switzerland