Table 3.
Comparison of wall shear stress and wall thickness measurements at ulcer site and non-ulcer site.
| Patient 1 | Patient 2 | Patient 3 | Patient 4 | Patient 5 | Patient 6 | Median | P value | ||
|---|---|---|---|---|---|---|---|---|---|
| Minimum wall shear stress (Pa) | Ulcer-site | 1.8 | 0.7 | 0.8 | 2.3 | 0.9 | NA | 0.9 [0.7–2.1] | 0.04 |
| Non-ulcer-site | 0.6 | 0.4 | 0.2 | 0.5 | 0.5 | NA | 0.5 [0.3–0.6] | ||
| Maximum wall shear stress (Pa) | Ulcer-site | 6.7 | 1.4 | 15.1 | 9.6 | 19.3 | NA | 9.6 [4.1–17.2] | 0.68 |
| Non-ulcer-site | 32.5 | 3.5 | 9.5 | 7.0 | 11.8 | NA | 9.5 [5.2–22.1] | ||
| Maximum oscillatory shear index | Ulcer-site | 0.05 | 0.01 | 0.09 | 0.01 | 0.01 | NA | 0.01 [0.01–0.07] | 0.04 |
| Non-ulcer-site | 0.10 | 0.02 | 0.10 | 0.04 | 0.07 | NA | 0.07 [0.03–0.10] | ||
| Maximum relative residence time (Pa−1) | Ulcer-site | 0.61 | 1.30 | 1.48 | 0.37 | 0.53 | NA | 0.61 [0.45–1.39] | 0.04 |
| Non-ulcer-site | 0.92 | 1.97 | 2.39 | 1.24 | 1.45 | NA | 1.44 [1.08–2.18] | ||
| Non-ulcer-site | 2.7 | 2.0 | 2.1 | 2.7 | 2.4 | NA | 2.7 [2.5–2.9] | ||
| Maximum wall thickness (mm) | Ulcer-site | 3.6 | 3.8 | 4.1 | 3.3 | 4.1 | NA | 3.8 [3.5–4.1] | 0.14 |
| Non-ulcer-site | 4.1 | 4.2 | 4.4 | 3.3 | 4.0 | NA | 4.1 [3.7–4.3] |
Maximum is 95th percentile, except for the wall thickness.