Table II.
Calf muscle hemoglobin oxygen saturation (StO2) variables in symptomatic patients with peripheral artery disease.
| Variables | Mean (SD) | Median (Min, Max) |
|---|---|---|
| StO2 at rest (% saturation) | 53 (19) | 54 (3, 96) |
| StO2 at 1 minute of exercise (% saturation) | 26 (23) | 22 (1, 86) |
| Absolute drop in StO2 from rest to 1 minute of exercise (% saturation) | 27 (19) | 24 (0, 82) |
| Percentage drop in StO2 from rest to 1 minute of exercise (%) | 56 (35) | 58 (0, 98) |
| Minimum exercise StO2 (% saturation) | 16 (19) | 9 (1, 79) |
| Absolute drop in StO2 from rest to the minimum exercise value (% saturation) | 36 (19) | 34 (1, 85) |
| Percentage drop in StO2 from rest to the minimum exercise value (%) | 71 (28) | 81 (2, 99) |
| Exercise time to minimum StO2 (sec) | 203 (250) | 87 (4, 1092) |
| StO2 rate of decline to exercise minimum (% saturation/sec) | 0.57 (0.75) | 0.35 (0.02, 7.14) |
| StO2 at peak walking time (% saturation) | 22 (21) | 15 (1, 94) |