title: [Examination of the optic nerve head blood flow in patients with proliferative diabetic retinopathy treated with vitrectomy].
abstract: OBJECTIVE
  To evaluate the optic nerve head blood flow level of a patient with proliferative diabetic retinopathy before and after vitrectomy, using laser speckle flow graphy (LSGF) for noninvasively ocular blood flow analysis.
  
  
  METHODS
  Twenty three eyes of 23 patients were recruited in the present study who underwent vitrectomy at Sapporo Medical University hospital. We measured optic nerve head blood flow before and 2 weeks after operation. The average blood pressure and ocular perfusion pressure were measured before and after surgery.
  
  
  RESULTS
  Blood flow in the central retinal artery and on both the nasal and temporal sides of the optic nerve head significantly increased after surgery in all cases. In cases where the post-operative blood flow in the optic disk temporal side increased by more than 59%, visual acuity was also ameliorated.
  
  
  CONCLUSIONS
  LSFG is an effective method for evaluating the optic nerve head blood flow noninvasively, and may be useful for prediction of postoperative visual acuity prognosis.
authors.affiliation: Department of Ophthalmology, Sapporo Medical University School of Medicine, Sapporo-shi, Japan.
authors.forename: Kimihito
authors.initials: K
authors.lastname: Maeda
authors.forename: Futoshi
authors.initials: F
authors.lastname: Ishikawa
authors.forename: Kazuo
authors.initials: K
authors.lastname: Kobayashi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ohguro
mesh_terms: D000328:Adult; D000368:Aged; D003930:Diabetic Retinopathy / Q000503:physiopathology* / Q000601:surgery*; D005260:Female; D018056:Hemorheology; D006801:Humans; D007834:Lasers; D008297:Male; D008875:Middle Aged; D009900:Optic Nerve / Q000098:blood supply*; D012039:Regional Blood Flow; D012212:Rheology / Q000379:methods; D013997:Time Factors; D014821:Vitrectomy