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Figure 4 The relationship between maximal ST elevation and collateral flow index (CFI) during the first intracoronary balloon occlusion. ST elevation is negatively related to collateral flow in the isolated early preconditioning (IEP) group (p < 0.01). However, this dependence is less marked in the second window of protection (SWOP) group. Moreover, when collateral support is poor (CFI < 0.25), ST elevation is less marked in the SWOP group (Table 2).