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Figure 4 Kaplan-Meier survival curves event free of cardiac death in patients stratified according to the results of rest-stress WMSI variation during DOB (Delta DOB WMSI). The survival is progressively worse for larger variations on WMSI. Delta DOB WMSI > .37 vs. DOB negative, p < 0.005. Cardiac death (n = 18); follow-up 38 ± 21 months.