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Figure 2 Illustration showing computer-based analysis of ST-segment shift in an animal with acute ST-segment elevation associated with a left circumflex occlusion (Table 1, pig 6). (A) Shows minor ST-segment depression in the baseline QRST, followed the next day by sudden ST-segment elevation. This shows a net 51% ST-segment shift, relative to baseline, and normalized to the QRS height. It should be noted that the programmer, in this example, manually shifted the P-Q segment to precede the actual Q-wave, as detected by the implantable ischemia detection system by approximately 30 ms.