Table 4. Doppler ultrasonography evaluation of blood flow velocities in orbital vessels.
| Orbital vessels | P-ON eyes | WP-ON eyes | HC eyes | P-value |
|---|---|---|---|---|
| CRA-PSV (cm/s) | 20.71±5.72 (12–32) | 20.18±6.07 (11–36) | 20.76±4.97 (12–31) | 0.90 |
| CRA-EDV (cm/s) | 7.89±2.34 (3.8–12.5) | 7.85±2.09 (4.8–13.5) | 8.09±2.21 (3.6–12.8) | 0.78 |
| CRA-RI | 0.63±0.07 (0.48–0.74) | 0.61±0.07 (0.5–0.78) | 0.61±0.06 (0.54– 0.78) | 0.53 |
| PCAs-PSV (cm/s) | 35.78±10.8 (23.6–57.5) | 33.76±10.42 (21.3–60.6) | 34.6 ±6.83 (26.7–48.4) | 0.68 |
| PCAs-EDV (cm/s) | 13.98±5.12 (7.6–23.6) | 13.71±5.72 (7.1–32.2) | 14.37±3.48 (6.7–21.8) | 0.41 |
| PCAs-RI | 0.61±0.06 (0.53–0.74) | 0.59±0.07 (0.48–0.75) | 0.59±0.06 (0.5–0.75) | 0.54 |
| OA-PSV (cm/s) | 56.97±13.61 (33.2–84.4) | 59.51±16.99 (33.1–104.2) | 69.39±18.76 (44.8–112.1) | 0.08 |
| OA-EDV (cm/s) | 16.01±4.95 (9.7–28.1) | 17.82±5.83 (10.5–36.3) | 21.69±7.67 (10.8–38.6) | 0.03 |
| OA-RI | 0.72±0.08 (0.57–0.84) | 0.70±0.05 (0.61–0.8) | 0.68±0.06 (0.58–0.8) | 0.19 |
| SOV (cm/s) | 15.18±6.57 (6.2–28.7) | 14.38±7.49 (6.7–37.1) | 12.67±3.39 (7.8–17.8) | 0.50 |
Abbreviations: CRA, central retinal artery; EDV, end-diastolic velocity; HC, healthy age-matched control; OA, ophthalmic artery; PCA, posterior ciliary artery; P-ON, with previous optic neuritis; PSV, peak systolic velocity, RI, resistive(resistance) index; SOV, superior ophthalmic vein; WP-ON, without previous optic neuritis. Kruskal–Wallis test. Data are mean±SD (min–max). Statistical italic entry refers to statistical significance (P<0.05).