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Figure 1 ECG changes observed from 24 to 48 h after AMI to six-month follow-up according to the different evolutionary changes of the negative T waves after hospital discharge. Patients with persistently positive T waves (group 1; n = 35), patients with  1 decrease in the number of negative T waves (group 2; n = 361), patients with no change in the number of negative T waves (group 3; n = 64) and patients with 1 increase in the number of negative T waves (group 4; n = 76) from predischarge to six-month follow-up.
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