Blood flow parameters in orbital vessels in normal control subjects and in patients with Graves' disease
| Mean (SD) velocity (cm/s) | |||
|---|---|---|---|
| Controls | Group A | Group B | |
| Ophthalmic artery | |||
| Peak systolic velocity | 35.6 (9.8) | 33.5 (8.9) | 41.4 (12.4) |
| End diastolic velocity | 9.7 (3.8) | 8.8 (2.7) | 11.9 (5.1) |
| Resistivity index | 0.73 (0.06) | 0.73 (0.06) | 0.72 (0.07) |
| Central retinal artery | |||
| Peak systolic velocity | 9.9 (1.5) | 10.0 (1.6) | 11.1 (2.4) |
| End diastolic velocity | 3.2 (0.7) | 3.3 (0.9) | 3.5 (0.9) |
| Resistivity index | 0.68 (0.07) | 0.67 (0.08) | 0.68 (0.07) |
| Central retinal vein | |||
| Maximal velocity | 4.8 (0.7) | 4.9 (0.9) | 5.4 (1.1) |
| Minimal velocity | 3.4 (0.7) | 3.4 (0.6) | 3.7 (0.6) |
| Superior ophthalmic vein | |||
| Maximal velocity | 10.1 (4.7) | 10.7 (4.4) | 8.0 (5.2) |
| Minimal velocity | 4.1 (3.7) | 4.3 (3.9) | 2.2 (6.1) |