title: Normalization of orbital arterial blood flow in non-ischemic central retinal vein occlusion after 6 months.
abstract: BACKGROUND
  Central retinal vein occlusion (CRVO) is a common vascular disorder and may lead to blindness. The aim of the study was to obtain information about the possible imbalance and recovery of orbital arterial blood flow in non-ischemic CRVO.
  
  
  METHODS
  Vascular resistance (pulsatility index-PI) in the orbital arteries of 14 patients with non-ischemic CRVO was examined within 3 weeks after onset of CRVO and 6 months later. The control group consisted of 14 age- and sex-matched healthy control eyes.
  
  
  RESULTS
  PI was increased in all orbital arteries of CRVO eyes measured within 3 weeks after the onset. Normal PI values were recorded in the same retrobulbar arteries, and re-measured 6 months later.
  
  
  CONCLUSIONS
  There is an increase in vascular resistance in all orbital arteries at the onset of non-ischemic CRVO, followed by a recovery of vascular resistance to normal levels 6 months later. The increase at the onset may be caused by arterial vasospasm or by intraocular hemostasis affecting the afferent arteries.
authors.affiliation: Department of Ophthalmology, University of Vienna Medical School, Austria. Veronika.Vecsei@akh-wien.ac.at
authors.forename: P V
authors.initials: PV
authors.lastname: Vécsei
authors.forename: K
authors.initials: K
authors.lastname: Kircher
authors.forename: N
authors.initials: N
authors.lastname: Maar
authors.forename: M
authors.initials: M
authors.lastname: Stur
authors.forename: H C
authors.initials: HC
authors.lastname: Bettelheim
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D005500:Follow-Up Studies; D006706:Homeostasis / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009915:Orbit / Q000098:blood supply*; D011673:Pulsatile Flow / Q000502:physiology; D012039:Regional Blood Flow / Q000502:physiology; D012170:Retinal Vein Occlusion / Q000175:diagnosis / Q000503:physiopathology*; D014655:Vascular Resistance / Q000502:physiology