title: Ultramicrosurgical removal of subretinal hemorrhage in cats.
abstract: Subretinal hemorrhages are associated with progressive degeneration of the outer retina and a corresponding poor visual prognosis. Mixed results have been reported in previous attempts to remove such subretinal hemorrhages. We developed an ultramicrosurgical system that used the control of a stereotactic micromanipulator to direct a micropipette tip through a small retinotomy into the subretinal space in three cat eyes. Low-dose recombinant tissue plasminogen activator was then introduced into the subretinal space around the subretinal hemorrhage via a controlled microinfusion system. The recombinant tissue plasminogen activator solution facilitated clot lysis and subsequent removal through the micropipette. Light- and electron-microscopic analysis of histopathologic specimens disclosed good preservation of retinal architecture in the three cat eyes in which experimental subretinal hemorrhages were removed. This was in contrast to the retinal degeneration observed in similar but untreated experimental subretinal hemorrhages.
authors.affiliation: Department of Ophthalmology, University of California, Davis Medical Center, Sacramento 95816.
authors.forename: C A
authors.initials: CA
authors.lastname: Toth
authors.forename: J D
authors.initials: JD
authors.lastname: Benner
authors.forename: L M
authors.initials: LM
authors.lastname: Hjelmeland
authors.forename: M B
authors.initials: MB
authors.lastname: Landers
authors.forename: L S
authors.initials: LS
authors.lastname: Morse
mesh_terms: D000818:Animals; D002415:Cats; D004195:Disease Models, Animal; D005654:Fundus Oculi; D008866:Microsurgery / Q000379:methods*; D011994:Recombinant Proteins / Q000008:administration & dosage; D012160:Retina / Q000648:ultrastructure; D012166:Retinal Hemorrhage / Q000473:pathology / Q000601:surgery*; D010959:Tissue Plasminogen Activator / Q000008:administration & dosage
chemical_list: D011994:Recombinant Proteins; D010959:Tissue Plasminogen Activator