title: Exchange of perfluorodecalin for gas or oil: a model for avoiding slippage.
abstract: BACKGROUND
  The introduction of liquid perfluorocarbons as an intraoperative tool has greatly facilitated retinal re-apposition in giant retinal tears (GRT) and relieving retinotomies (RR). Slippage of the retina can occur during the exchange of heavy liquids for oil or gas, especially if the fill of perfluorocarbons is subtotal.
  
  
  METHODS
  We have used a model eye chamber to study the surface interactions of perfluorodecalin (PFD) with silicone oil and air to evaluate possible mechanisms of slippage.
  
  
  RESULTS
  The results demonstrate that it is possible during a PFD/air exchange to trap a wedge of aqueous which is displaced laterally and forced posteriorly during removal of the PFD, whereas during a PFD/silicone oil exchange the remaining aqueous is displaced laterally and upwards and thus trapped above the silicone oil/PFD interface.
  
  
  CONCLUSIONS
  We believe that during PFD/air exchange the displacement of the aqueous posteriorly can cause slippage and that this could be avoided by performing a direct PFD/silicone oil exchange.
authors.affiliation: St. Paul's Eye Unit, Royal Liverpool University Hospital, UK.
authors.forename: D
authors.initials: D
authors.lastname: Wong
authors.forename: R L
authors.initials: RL
authors.lastname: Williams
authors.forename: M J
authors.initials: MJ
authors.lastname: German
mesh_terms: D000388:Air; D005466:Fluorocarbons; D006801:Humans; D007431:Intraoperative Complications / Q000517:prevention & control*; D008953:Models, Anatomic; D013508:Ophthalmologic Surgical Procedures; D012167:Retinal Perforations / Q000601:surgery*; D012709:Serum Albumin; D012827:Silicone Oils; D018630:Vitreoretinopathy, Proliferative / Q000601:surgery*
chemical_list: D005466:Fluorocarbons; D012709:Serum Albumin; D012827:Silicone Oils; C008805:perfluorodecalin