Table 2.
Baseline exercise stress test characteristics categorized based on METs achieved
| Variable | Exercise Work Load (N=1,052)
|
||||||
|---|---|---|---|---|---|---|---|
| <7 METs (N=464)
|
≥7 METs (N=588)
|
||||||
| PCI+OMT (N=241) |
OMT (N=223) |
P value | PCI+OMT (N=286) |
OMT (N=302) |
P value | ||
| Exercise Protocol | Bruce | 145 (60%) | 138 (62%) | 285 (99.7%) | 298 (99%) | ||
| Modified Bruce | 61(25%) | 55 (25%) | 0 | 4 (1%) | |||
| Naughton | 9 (4%) | 9 (4%) | 0 | 0 | |||
| Balke/Other | 26 (11%) | 21 (9%) | 1 (0.3%) | 0 | |||
| Exercise Duration | <5 minutes | 123 (51%) | 110 (49%) | 0 | 0 | ||
| 5–7 minutes | 77 (32%) | 77 (35%) | 71 (25%) | 97 (32%) | |||
| 7–9 minutes | 21 (9%) | 19 (9%) | 137 (48%) | 138 (46%) | |||
| >9 minutes | 20 (8%) | 17 (8%) | 78 (27%) | 67 (22%) | |||
| Exercise Duration (mean ± SD) | 5.3 ± 2.3 | 5.3 ± 2.2 | 0.99 | 8.4 ± 2.2 | 8.0 ± 1.7 | 0.02 | |
| METs achieved | <3 | 80 (33%) | 69 (31%) | 0 | 0 | ||
| 4–6 | 161 (67%) | 154 (69%) | 0 | 0 | |||
| 7–9 | 0 | 0 | 180 (63%) | 213 (71%) | |||
| >9 | 0 | 0 | 106 (37%) | 89 (29%) | |||
| METs achieved (mean ± SD) | 4.1 ± 1.3 | 4.2 ± 1.3 | 0.59 | 8.4 ± 2.1 | 8.0 ± 1.6 | 0.009* | |
| ST segment depressions (mm) | <1 | 67 (28%) | 63 (29%) | 0.80 | 95 (33%) | 101 (34%) | 0.80 |
| 1–2 | 126 (53%) | 120 (54%) | 132 (46%) | 142 (48%) | |||
| >2 | 47 (20%) | 38 (17%) | 59 (21%) | 55 (18%) | |||
METs = metabolic equivalents; mins = minutes; OMT = optimal medical therapy; PCI = percutaneous coronary intervention; SD = standard deviation.
*
p <0.01 significant.