title: The effect of optic disk edema on spontaneous venous pulsations.
abstract: OBJECTIVE
  We evaluated the effect of optic disk edema on spontaneous venous pulsations (SVP) in patients without elevated intracranial pressure (ICP).Prospective, cross-sectional comparison in an institutional setting.
  
  
  METHODS
  Twenty consecutive patients with unilateral optic disk edema due to anterior ischemic optic neuropathy (AION, n = 11) or optic neuritis (n = 9) were evaluated. The proportion of subjects with SVP in both eyes, the involved eye only, the uninvolved eye only, or neither eye was determined. Comparisons were made using the Exact McNemar Test.
  
  
  RESULTS
  There was a significant difference in the proportion of uninvolved and involved eyes with SVP (60% [12/20] vs 5% [1/20], P <.005). Spontaneous venous pulsations were present in the uninvolved eye of 12 patients and the nonedematous portion of the optic disk in 1 patient with segmental edema from AION.
  
  
  CONCLUSIONS
  Optic disk edema may cause SVP cessation without ICP elevation.
authors.affiliation: Department of Ophthalmology, University of California at Irvine, College of Medicine, 92697, USA. tmcculle@uci.edu
authors.forename: Timothy J
authors.initials: TJ
authors.lastname: McCulley
authors.forename: Byron L
authors.initials: BL
authors.lastname: Lam
authors.forename: Swaraj
authors.initials: S
authors.lastname: Bose
authors.forename: William J
authors.initials: WJ
authors.lastname: Feuer
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009898:Optic Disk / Q000098:blood supply*; D009902:Optic Neuritis / Q000150:complications; D018917:Optic Neuropathy, Ischemic / Q000150:complications; D010211:Papilledema / Q000209:etiology / Q000503:physiopathology*; D011446:Prospective Studies; D011673:Pulsatile Flow / Q000502:physiology*; D014690:Venous Pressure / Q000502:physiology*