title: Long-term outcomes of vitrectomy with or without arteriovenous sheathotomy in branch retinal vein occlusion.
abstract: OBJECTIVE
  To evaluate the long-term effect of vitrectomy with or without arteriovenous sheathotomy for macular edema secondary to branch retinal vein occlusion (BRVO).
  
  
  METHODS
  The study was a prospective, randomized, comparative, interventional case series of 36 patients (36 eyes) who underwent pars plana vitrectomy with or without arteriovenous sheathotomy for macular edema due to BRVO of <or=8 weeks' duration of symptoms. Eighteen eyes with arteriovenous sheathotomy (sheathotomy group) were compared with 18 eyes without sheathotomy (vitrectomy group). Main outcomes measures were best-corrected visual acuity and central foveal thickness as evaluated by optical coherence tomography.
  
  
  RESULTS
  Baseline demographic characteristics of the groups were similar. Postoperative follow-up period ranged from 12 months to 45 months (31 months). Median best-corrected visual acuity significantly improved from 0.4 at baseline to 1.0 at the final visit in both groups, and there was no significant difference in best-corrected visual acuity at any postoperative period between the groups. Of 16 patients with duration of symptoms of <4 weeks, those with arteriovenous sheathotomy had a tendency toward better visual outcomes than those without arteriovenous sheathotomy (P = 0.064). The central foveal thickness also significantly decreased after surgery in both groups, but the differences were not significant for the two groups at each time point. No patients had severe intraoperative and/or postoperative complications.
  
  
  CONCLUSIONS
  Our findings suggest that vitrectomy with or without arteriovenous sheathotomy may improve the long-term functional and tomographic outcomes for patients with macular edema secondary to BRVO. Although additional arteriovenous sheathotomy did not lead to a distinct functional benefit in this series, early surgical intervention may result in better visual outcomes.
authors.affiliation: Shinjo Ophthalmologic Institute, Miyazaki, Japan. kumagai3@f8.dion.ne.jp
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Kumagai
authors.forename: Mariko
authors.initials: M
authors.lastname: Furukawa
authors.forename: Nobuchika
authors.initials: N
authors.lastname: Ogino
authors.forename: Akinori
authors.initials: A
authors.lastname: Uemura
authors.forename: Eric
authors.initials: E
authors.lastname: Larson
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003238:Connective Tissue / Q000601:surgery*; D019299:Decompression, Surgical / Q000379:methods*; D005260:Female; D005451:Fluorescein Angiography; D005500:Follow-Up Studies; D006801:Humans; D008269:Macular Edema / Q000209:etiology / Q000601:surgery; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012161:Retinal Artery; D012169:Retinal Vein; D012170:Retinal Vein Occlusion / Q000150:complications / Q000503:physiopathology / Q000601:surgery*; D041623:Tomography, Optical Coherence; D016896:Treatment Outcome; D014792:Visual Acuity / Q000502:physiology; D014821:Vitrectomy / Q000379:methods*