title: Preliminary clinical observation of arteriovenous sheathotomy for treatment of branch retinal vein occlusion.
abstract: OBJECTIVE
  To document the anatomic and functional improvement of six patients with branch retinal vein occlusion (BRVO) following successful arteriovenous adventitial sheathotomy (AAS).
  
  
  METHODS
  Retrospective study of 6 patients (6 eyes) with BRVO treated with AAS. All patients were not eligible for laser photocoagulation and had both macular edema and intraretinal hemorrhage. The visual acuity was in the range of 0.4 to 0.02. All patients underwent pars plana vitrectomy and AAS. The clinical improvement was determined by fundus photograph, fluorescein angiography (FAG), optical coherence tomography (OCT) and multifocal electroretinography (ERG). All patients were followed postoperatively for an average of 20 months ranging from 12 to 24 months.
  
  
  RESULTS
  Sheathotomy and decompression of the arteriole/venule (A/V) crossing were achieved in all 6 patients. 5 patients have improved their best-corrected visual acuity 4 lines or more. The best one could reach to 1.0. One month after the operation, fundus photograph and FAG demonstrated the resolution of intraretinal hemorrhage, reduction of non-perfusion area and apparent resolution of retinal venous dilation and tortuosity. OCT confirmed remarkable reduction of retinal thickness. The microcysts at the fovea diminished. Multifocal ERG showed the recovery of the central peak at the macular and the peripheral response density. However, capillary nonperfusion area and microaneurysm were found out by FAG in four patients at the points distal to the sheathotomy three months after the operation.
  
  
  CONCLUSIONS
  Anatomic and functional improvement of retina can be achieved in patients with BRVO through AAS. However, the capillary nonperfusion and microaneurysm may follow this surgical procedure in some cases that need further treatment with laser photocoagulation. The better visual improvement may be expected in the patients with earlier surgical intervention.
authors.affiliation: Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou 510060, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Lu
authors.forename: Yonghao
authors.initials: Y
authors.lastname: Li
authors.forename: Changxian
authors.initials: C
authors.lastname: Yi
authors.forename: Mei
authors.initials: M
authors.lastname: Li
authors.forename: Xiulan
authors.initials: X
authors.lastname: Lu
authors.forename: Jinglin
authors.initials: J
authors.lastname: Zhang
mesh_terms: D000368:Aged; D019299:Decompression, Surgical; D004487:Edema / Q000150:complications / Q000601:surgery; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D017075:Laser Coagulation; D008266:Macula Lutea; D008269:Macular Edema / Q000150:complications / Q000601:surgery; D008297:Male; D008875:Middle Aged; D013508:Ophthalmologic Surgical Procedures; D012161:Retinal Artery / Q000601:surgery*; D012164:Retinal Diseases / Q000150:complications / Q000601:surgery; D012169:Retinal Vein / Q000601:surgery*; D012170:Retinal Vein Occlusion / Q000150:complications / Q000601:surgery*; D012189:Retrospective Studies; D014792:Visual Acuity