title: Investigation of blood flow velocity by color Doppler imaging in nonischemic central retinal vein occlusion with collateral veins.
abstract: OBJECTIVE
  To study the blood flow velocity in the central retinal vein after the resolution of non-ischemic central retinal vein occlusion (CRVO) with optociliary vein (OCV).
  
  
  METHODS
  Eleven patients and 22 healthy volunteers were studied. Indocyanine green (ICG) angiography was used to investigate the choroidal veins in the affected eyes. Color Doppler imaging was used to measure the blood velocity in the central retinal artery and vein in the 11 affected and 22 healthy eyes.
  
  
  RESULTS
  Indocyanine green angiography verified the formation of retinochoroidal collaterals in all the affected eyes. The velocity in the central retinal vein was significantly lower in the affected eyes.
  
  
  CONCLUSIONS
  The results indicate that the collaterals are important routes of extraretinal outflow of retinal venous blood. It is recommended in the investigation of CRVO by color Doppler imaging to perform ICG angiography to determine if retinochoroidal collateral veins have been formed.
authors.affiliation: Department of Ophthalmology, NTT West Osaka Hospital, Osaka, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Suzuki
authors.forename: N
authors.initials: N
authors.lastname: Okamoto
authors.forename: M
authors.initials: M
authors.lastname: Ohnishi
authors.forename: S
authors.initials: S
authors.lastname: Tsubakimori
authors.forename: M
authors.initials: M
authors.lastname: Fukuda
mesh_terms: D000368:Aged; D001783:Blood Flow Velocity; D002829:Choroid / Q000098:blood supply* / Q000000981:diagnostic imaging; D003097:Collateral Circulation; D005260:Female; D005451:Fluorescein Angiography; D006801:Humans; D007208:Indocyanine Green; D008297:Male; D008875:Middle Aged; D012169:Retinal Vein / Q000000981:diagnostic imaging / Q000503:physiopathology*; D012170:Retinal Vein Occlusion / Q000000981:diagnostic imaging / Q000503:physiopathology*; D018615:Ultrasonography, Doppler, Color; D014680:Veins
chemical_list: D007208:Indocyanine Green