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Figure 4 The impact of population risk on the annual cardiac event rates after single-photon emission computed tomography (SPECT) perfusion imaging. Excellent risk stratification is achieved with both exercise and dobutamine SPECT imaging as reflected by a roughly fivefold differential in event rates between patients with normal and abnormal SPECT results. However, regardless of SPECT results, event rates are higher in patients referred for dobutamine stress than they are in those referred for exercise stress, reflecting the higher intrinsic cardiac risk in patients referred for dobutamine perfusion imaging.
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