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Figure 6 Vertical long-axis images in two cases of different types. The patient on the left side showed low fluorine-18 fluoro-2-deoxyglucose (FDG) uptake both during fasting (a) (total uptake score = 0) and after glucose loading (b) (global percent uptake of injected dose per 100 g tissue [G%ID] 0.36%), and a low myocardial perfusion defect score (c) (total defect score = 11). This patient had severe fibrosis (Fig. 7a), and the left ventricular ejection fraction did not improve after ß-blocker therapy (from 0.20 to 0.20). The patient on the right side had high FDG uptake both during fasting (d) (total uptake score = 47) and after glucose loading (e) (G%ID 0.96%). Myocardial perfusion was also maintained (f) (total defect score = 13). Although dilation of the left ventricle was severe, the left ventricular ejection fraction was improved by the ß-blocker (from 0.18 to 0.56) to the point where the patient became symptom-free. Histologic examination revealed severe myocyte degeneration and little fibrosis (Fig. 7b). SPECT = single-photon emission computed tomography.
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