title: Experimental vitreous and aqueous replacement with perfluorophenanthrene. Clinical, histologic, and electrophysiologic results.
abstract: OBJECTIVE
  Anterior and posterior segment changes of experimental vitreous and aqueous substitution with Perfluorophenanthrene were evaluated.
  
  
  METHODS
  In 28 rabbit eyes that underwent vitrectomy, tamponades of 1.2 cc Perfluorophenanthrene remained as long as 8 weeks under clinical and electrophysiologic control. Histologic examinations of the eyes were done 1, 2, 4, and 8 weeks after insertion of the tamponade. In an additional 15 rabbit eyes, Perfluorophenanthrene was injected into the anterior chamber, and in some cases it was removed after 2 and 4 weeks, respectively. Follow-up examinations, which were done no later than 12 weeks after injection, included clinical appearance, endothelial cell counts, corneal pachymetry, tonometry, and histopathology.
  
  
  RESULTS
  Histologically we found narrowing of the outer plexiform layer and single macrophages in the inferior retina after 2 weeks. Cell loss in the outer nuclear layer and wrinkling of the outer retinal layers were observed after 4 weeks, which lead to the development of irregularities of all layers inferiorly after 8 weeks. Electroretinograms showed unchanged b-wave amplitudes after maximal light stimulation at each examination, but separate interpretation of low light intensity responses showed a significant decrease in b-wave amplitudes 4 weeks after surgery. Anterior segment intolerance started with stromal edema on the second day after surgery; corneal vascularization and scar formation occurred subsequently. Inferior endothelial cell density decreased to about 50%. Histologically inflammatory reactions, vacuolization of the inferior trabecular meshwork, and closure of the chamber angle between 5 and 7 o'clock were observed.
  
  
  CONCLUSIONS
  Perfluorophenanthrene is only suitable for very short-term vitreous replacement unless prolapsing into the anterior chamber. Damages to the retina were observed 2 weeks after surgery.
authors.affiliation: Department of Ophthalmology B, University of Vienna, Austria.
authors.forename: U
authors.initials: U
authors.lastname: Stolba
authors.forename: K
authors.initials: K
authors.lastname: Krepler
authors.forename: R
authors.initials: R
authors.lastname: Pflug
authors.forename: M
authors.initials: M
authors.lastname: Velikay
authors.forename: A
authors.initials: A
authors.lastname: Wedrich
authors.forename: S
authors.initials: S
authors.lastname: Binder
mesh_terms: D000818:Animals; D000867:Anterior Chamber / Q000601:surgery*; D001082:Aqueous Humor / Q000187:drug effects*; D002452:Cell Count; D003287:Contrast Media / Q000009:adverse effects*; D015715:Corneal Edema / Q000139:chemically induced / Q000473:pathology; D004195:Disease Models, Animal; D004596:Electroretinography / Q000187:drug effects; D005466:Fluorocarbons / Q000009:adverse effects*; D005500:Follow-Up Studies; D007429:Intraocular Pressure; D011183:Postoperative Complications / Q000139:chemically induced / Q000473:pathology / Q000503:physiopathology; D019736:Prostheses and Implants / Q000009:adverse effects; D011817:Rabbits; D012160:Retina / Q000187:drug effects* / Q000503:physiopathology; D012164:Retinal Diseases / Q000139:chemically induced / Q000473:pathology / Q000503:physiopathology; D014129:Trabecular Meshwork / Q000473:pathology; D014821:Vitrectomy; D014822:Vitreous Body / Q000187:drug effects*
chemical_list: D003287:Contrast Media; D005466:Fluorocarbons; C047722:perfluorophenanthrene