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Figure 2 Pattern of ST-segment deviation in the second window of protection (SWOP). Panels A and B are representative electrocardiograms (ECGs) taken from a patient in the SWOP group with a collateral flow index of 0.2. Panel A shows the appearance of precordial ECG leads V4 and V5 at 5 min of exercise on efforts 1 to 4 (see Fig. 1). In this particular example, the attenuation of ST depression seen on exercise treadmill test (ETT) 2 versus ETT 1 is less marked, though still apparent, on ETT 3. A similar trend was seen in the group data (Table 2). However, on ETT 4, performed 24 h after ETT 1, the attenuation of ST depression is at least as marked as on ETT 2. Panel B is from the surface 12-lead ECG recorded after 180 s of the first and second intracoronary balloon occlusions. In contrast to patients in the IEP group, there is no attenuation of ST elevation on the second balloon occlusion. Furthermore, in the grouped data (Table 2) the magnitude of ST elevation on first inflation is less than in the IEP group.
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