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Figure 3 ST-segment elevation during the first and second intracoronary balloon occlusions of the left anterior descending coronary artery in early and late preconditioning groups. With increasing duration of ischemia, the attenuation of ST elevation seen on the second compared with the first occlusion is apparent only in the early preconditioning group. In addition, the absolute magnitude of ST elevation on occlusion 1 is less in the SWOP than in the IEP group (see Table 2). Two-way repeated-measures analysis of variance was performed with post-hypothesis testing to compare the degree of ST elevation between inflations 1 and 2 at 30-s intervals, having examined the effects of time, treatment, and group. *p < 0.05,  p < 0.01 for occlusion 1 versus occlusion 2.
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