The group mean 5-min recovery maps and the recovery minus rest subtraction maps confirmed that, on average, substantial ST integral ischemic changes persisted, although significantly lessened, at 5-min postexercise in all four CAD groups (Fig 4; Table 2). The equivalent maps of the normal subjects indicated, in contrast, a return to near rest status by 5 min postexercise (Fig 4).
The group mean ST integral maps of the left anterior descending, right and circumflex artery subgroups of CAD patient group 1 (Table 1) are illustrated in Figure 5. There were major differences in resting ST patterns between the left anterior descending patients maps and those of the other 2 subgroups (Fig 5). There was, however, considerable intergroup spatial similarity of torso areas displaying ST integral decrease between rest and cessation of exercise (Fig 5). Patients with right and circumflex CAD tended, however, to have exercise minima located more superiorly on the torso surface, compared with patients with left anterior descending CAD (Fig 5). As in their parent group (Fig 4), the single-vessel subgroups had retention of ST ischemic changes at 5 min postcessation of exercise (Fig 5).
Not surprisingly, there was quantitative overlap of individual ST integral decreases with exercise (Table 2). For example, patient 5 (Fig 1 and 2; Table 2), with single-vessel CAD had as much exercise ST integral decrease as all but one patient (patient 24, Table 2) with two-vessel CAD and all but one patient (patient 35, Table 2; Fig 3) with three-vessel CAD. In contrast, only one of the group 2 CAD patients (patient 29, Table 2) and none of the group 3 patients had sum ST decrease with exercise that was less than the mean value for the group 1 CAD patients (Table 2).
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