Table 1

Blood flow parameters in orbital vessels in normal control subjects and in patients with Graves' disease

Mean (SD) velocity (cm/s)
ControlsGroup AGroup B
Ophthalmic artery
 Peak systolic velocity35.6  (9.8)33.5  (8.9)41.4  (12.4)
 End diastolic velocity9.7 (3.8)8.8 (2.7)11.9 (5.1)
 Resistivity index0.73 (0.06)0.73 (0.06)0.72 (0.07)
Central retinal artery
 Peak systolic velocity9.9 (1.5)10.0 (1.6)11.1 (2.4)
 End diastolic velocity3.2 (0.7)3.3 (0.9)3.5 (0.9)
 Resistivity index0.68 (0.07)0.67 (0.08)0.68 (0.07)
Central retinal vein
 Maximal velocity4.8 (0.7)4.9 (0.9)5.4 (1.1)
 Minimal velocity3.4 (0.7)3.4 (0.6)3.7 (0.6)
Superior ophthalmic vein
 Maximal velocity10.1 (4.7)10.7 (4.4)8.0 (5.2)
 Minimal velocity4.1 (3.7)4.3 (3.9)2.2 (6.1)