title: 23-gauge transconjunctival vitrectomy in eyes with pre-existing functioning filtering blebs.
abstract: BACKGROUND
  We investigated the outcome of 23-gauge transconjunctival pars plana vitrectomy (23G PPV) for the treatment of vitreoretinal disorder in patients with prior trabeculectomy.
  
  
  METHODS
  We retrospectively reviewed medical records of 23G PPV in 11 eyes that had functioning filtering blebs after trabeculectomy. The main outcome measures were the visual acuity, intraocular pressure (IOP) and subconjunctival fluid height in bleb by anterior segment optical coherence tomography (OCT) before and after the surgery.
  
  
  RESULTS
  Eyes that had 23G PPV showed improvement of visual acuity after the surgery (P =0.003). Mean IOP was 13.82 mmHg before 23G PPV and 15.82 mmHg at 6 months postoperatively, which was statistically insignificant (P = 0.758). The bleb was observed before and after surgery using anterior segment OCT, and the difference in subconjunctival fluid was not statistically significant (P =0.172).
  
  
  CONCLUSIONS
  23G PPV did not adversely affect bleb function in eyes with prior trabeculectomy.
authors.affiliation: Department of Ophthalmology, Chosun University School of Medicine, 365# Philmun-daero street, Dong-gu, Gwangju District, 501-717, Republic of Korea. s20age@hanmail.net.
authors.forename: Seong Taeck
authors.initials: ST
authors.lastname: Kim
authors.affiliation: Department of Ophthalmology, Chosun University School of Medicine, 365# Philmun-daero street, Dong-gu, Gwangju District, 501-717, Republic of Korea. romacat@naver.com.
authors.forename: Gwang Rae
authors.initials: GR
authors.lastname: Shin
authors.affiliation: Department of Ophthalmology, Chosun University School of Medicine, 365# Philmun-daero street, Dong-gu, Gwangju District, 501-717, Republic of Korea. jimani20@naver.com.
authors.forename: Ji Man
authors.initials: JM
authors.lastname: Park
mesh_terms: D000368:Aged; D003228:Conjunctiva / Q000601:surgery*; D005260:Female; D005901:Glaucoma / Q000503:physiopathology / Q000601:surgery*; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology; D008297:Male; D008866:Microsurgery / Q000379:methods; D008875:Middle Aged; D012164:Retinal Diseases / Q000503:physiopathology / Q000601:surgery*; D012189:Retrospective Studies; D041623:Tomography, Optical Coherence; D014129:Trabecular Meshwork / Q000502:physiology; D014130:Trabeculectomy; D014792:Visual Acuity / Q000502:physiology; D014821:Vitrectomy / Q000379:methods*; D057586:Vitreoretinal Surgery