title: Posterior sub-Tenon's capsule injection of triamcinolone acetonide prevents panretinal photocoagulation-induced visual dysfunction in patients with severe diabetic retinopathy and good vision.
abstract: OBJECTIVE
  To evaluate prospectively the efficacy of a single sub-Tenon's capsule injection of triamcinolone acetonide (TA) against panretinal photocoagulation (PRP)-induced macular thickening and visual disturbance in patients with severe diabetic retinopathy and good vision.
  
  
  METHODS
  Prospective, comparative, interventional case series.
  
  
  METHODS
  Twenty eyes of 10 patients with severe nonproliferative diabetic retinopathy or non-high-risk proliferative diabetic retinopathy whose visual acuity was 20/40 or better (<0.3 in logarithm of the minimum angle of resolution [logMAR] acuity) before the PRP, whose retinopathy was bilateral and symmetrical. The averaged parafoveal retinal thickness was more than 300 microm, leading to a worse visual prognosis after PRP.
  
  
  METHODS
  Sub-Tenon's capsule injection of 20 mg TA.
  
  
  METHODS
  Best-corrected visual acuity (BCVA) with logMAR chart and averaged foveal thickness (FT) using the retinal mapping program of optical coherence tomography.
  
  
  METHODS
  In all patients, PRP was performed every other week for 4 sessions on both eyes, and 1 week before PRP; 1 eye received the TA injection, and the other eye served as a control. The clinical course of BCVA and FT was monitored for up to 24 weeks after beginning PRP.
  
  
  RESULTS
  Before TA injection, BCVA and FT were 0.055+/-0.072 and 235.5+/-37.5 microm in the TA-injected eye and 0.065+/-0.071 and 233.7+/-39.8 microm in the control eye, respectively; there was no significant difference between eyes. After the TA injection, FT in the TA-injected eyes was significantly decreased. During and after the PRP, FT in the control eye increased dramatically and reached 312.0+/-68.2 microm at 24 weeks, which was significantly different from that in the TA-injected eyes (235.3+/-38.6 microm at 24 weeks). Best-corrected visual acuity in the control eye decreased with time to 0.24+/-0.13; in contrast, and BCVA in the TA-injected eye was good (to 0.085+/-0.11) .
  
  
  CONCLUSIONS
  As a pretreatment for PRP, a single sub-Tenon's capsule injection of TA has beneficial effects for preventing PRP-induced foveal thickening and visual dysfunction in patients with severe diabetic retinopathy and good vision.
authors.affiliation: Department of Ophthalmology, NTT East Japan Tohoku Hospital, Sendai, Miyagi, Japan. masahiko@oph.med.tohoku.ac.jp
authors.forename: Masahiko
authors.initials: M
authors.lastname: Shimura
authors.forename: Kanako
authors.initials: K
authors.lastname: Yasuda
authors.forename: Takashi
authors.initials: T
authors.lastname: Shiono
mesh_terms: D000368:Aged; D003238:Connective Tissue; D003930:Diabetic Retinopathy / Q000175:diagnosis / Q000503:physiopathology* / Q000601:surgery*; D005123:Eye; D005260:Female; D005584:Fovea Centralis / Q000187:drug effects / Q000473:pathology; D005938:Glucocorticoids / Q000008:administration & dosage* / Q000627:therapeutic use; D006801:Humans; D007267:Injections; D008028:Light Coagulation / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D011300:Preoperative Care; D011446:Prospective Studies; D012160:Retina / Q000601:surgery; D012720:Severity of Illness Index; D041623:Tomography, Optical Coherence; D014222:Triamcinolone Acetonide / Q000008:administration & dosage* / Q000627:therapeutic use; D014786:Vision Disorders / Q000517:prevention & control*; D014785:Vision, Ocular
chemical_list: D005938:Glucocorticoids; D014222:Triamcinolone Acetonide